ESB-2018.0284.4 - UPDATE [Cisco] Cisco Adaptive Security Appliance: Execute arbitrary code/commands - Remote/unauthenticated 2018-02-08

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                              ESB-2018.0284.4
  Cisco Security Advisory: Cisco Adaptive Security Appliance Remote Code
               Execution and Denial of Service Vulnerability
                              8 February 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco Adaptive Security Appliance
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0101  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180129-asa1

Revision History:  February  8 2018: Clarified vulnerable configuration, malicious use observed
                   February  6 2018: Initial patch incomplete, new attack vectors
                   January  31 2018: Updated identification and patching information
                   January  30 2018: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Adaptive Security Appliance Remote Code Execution and Denial of Service
Vulnerability

Critical

Advisory ID: cisco-sa-20180129-asa1

First Published: 2018 January 29 17:00 GMT

Last Updated: 2018 February 7 16:07 GMT

Version 2.2: Final

Workarounds: No workarounds available

Cisco Bug IDs: CSCvg35618
               CSCvh79732
               CSCvh81737
               CSCvh81870

CVSS Score: Base 10.0

CVE-2018-0101

CWE-415


Summary

UPDATED 2/5/2018: After further investigation, Cisco has identified additional
attack vectors and features that are affected by this vulnerability. In
addition, it was also found that the original fix was incomplete so new fixed
code versions are now available. Please see the Fixed Software section for more
information.

A vulnerability in the XML parser of Cisco Adaptive Security Appliance (ASA)
Software could allow an unauthenticated, remote attacker to cause a reload of
the affected system or to remotely execute code. It was also possible that  the
ASA could stop processing incoming Virtual Private Network (VPN) authentication
requests due to a low memory condition.

The vulnerability is due to an issue with allocating and freeing memory when
processing a malicious XML payload. An attacker could exploit this vulnerability
by sending a crafted XML packet to a vulnerable interface on an affected system.
An exploit could allow the attacker to execute arbitrary code and obtain full
control of the system, cause a reload of the affected device or stop processing
of incoming VPN authentication requests.

To be vulnerable the ASA must have Secure Socket Layer (SSL) services or IKEv2
Remote Access VPN services enabled on an interface. The risk of the
vulnerability being exploited also depends on the accessibility of the interface
to the attacker. For a comprehensive list of vulnerable ASA features please
refer to the table in the Vulnerable Products section.

Cisco has released software updates that address this vulnerability. There are
no workarounds that address all the features that are affected by this
vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180129-asa1


Affected Products

Vulnerable Products

This vulnerability affects Cisco ASA Software that is running on the following
Cisco products:

    3000 Series Industrial Security Appliance (ISA)
    ASA 5500 Series Adaptive Security Appliances
    ASA 5500-X Series Next-Generation Firewalls
    ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers
    ASA 1000V Cloud Firewall
    Adaptive Security Virtual Appliance (ASAv)
    Firepower 2100 Series Security Appliance
    Firepower 4110 Security Appliance
    Firepower 4120 Security Appliance
    Firepower 4140 Security Appliance
    Firepower 4150 Security Appliance
    Firepower 9300 ASA Security Module
    Firepower Threat Defense Software (FTD)
    FTD Virtual

ASA Software

In the following table, the left column lists the vulnerable Cisco ASA features.
The right column indicates the vulnerable configuration from the CLI command
show running-config, if it can be determined.

+----------------------------------------------+------------------------------+
|                   Feature                    |   Vulnerable Configuration   |
+----------------------------------------------+------------------------------+
|                                              | http server enable <port>    |
| Adaptive Security Device Manager (ASDM)^1    | http <remote_ip_address>     |
|                                              | <remote_subnet_mask>         |
|                                              | <interface_name>             |
+----------------------------------------------+------------------------------+
|                                              | crypto ikev2 enable          |
|                                              | <interface_name>             |
| AnyConnect IKEv2 Remote Access (with client  | client-services port <port   |
| services)                                    | #>                           |
|                                              | webvpn                       |
|                                              |    anyconnect enable         |
+----------------------------------------------+------------------------------+
|                                              | crypto ikev2 enable          |
| AnyConnect IKEv2 Remote Access (without      | <interface_name>             |
| client services)                             | webvpn                       |
|                                              |    anyconnect enable         |
+----------------------------------------------+------------------------------+
| AnyConnect SSL VPN                           | webvpn                       |
|                                              |    enable <interface_name>   |
+----------------------------------------------+------------------------------+
|                                              | http server enable <port>    |
| Cisco Security Manager^2                     | http <remote_ip_address>     |
|                                              | <remote_subnet_mask>         |
|                                              | <interface_name>             |
+----------------------------------------------+------------------------------+
| Clientless SSL VPN                           | webvpn                       |
|                                              |    enable <interface_name>   |
+----------------------------------------------+------------------------------+
| Cut-Through Proxy (Not vulnerable unless     | aaa authentication listener  |
| used in conjunction with other vulnerable    | <interface_name> port        |
| features on the same port)                   | <number>                     |
+----------------------------------------------+------------------------------+
| Local Certificate Authority (CA)             | crypto ca server             |
|                                              |  no shutdown                 |
+----------------------------------------------+------------------------------+
| Mobile Device Manager (MDM) Proxy^3          | mdm-proxy                    |
|                                              |   enable <interface_name>    |
+----------------------------------------------+------------------------------+
|                                              | webvpn                       |
|                                              |  mus password <password>     |
| Mobile User Security (MUS)                   |  mus server enable port      |
|                                              | <port #>                     |
|                                              |  mus <address> <mask>        |
|                                              | <interface_name>             |
+----------------------------------------------+------------------------------+
| Proxy Bypass                                 | webvpn                       |
|                                              |   proxy-bypass               |
+----------------------------------------------+------------------------------+
|                                              | rest-api image disk0:/<image |
| REST API^4                                   | name>                        |
|                                              | rest-api agent               |
+----------------------------------------------+------------------------------+
| Security Assertion Markup Language (SAML)    | N/A                          |
| Single Sign-On (SSO)^5                       |                              |
+----------------------------------------------+------------------------------+

^1 ASDM is vulnerable only from an IP address in the configured http command
range.
^2 Cisco Security Manager is vulnerable only from an IP address in the
configured http command range.
^3 The MDM Proxy is first supported as of software release 9.3.1.
^4 The REST API is first supported as of software release 9.3.2. The REST API is
vulnerable only from an IP address in the configured http command range.
^5 SAML SSO is first supported as of software release 9.6.


The customer can also use the show asp table socket | include SSL|DTLS command
and look for an SSL or a DTLS listen socket on any TCP port. If either socket is
present in the output and the ASA device is configured for one or more of the
ASA features in the above table, the device is considered vulnerable. The
following example shows an ASA device with SSL and DTLS listen sockets:

    ciscoasa# show asp table socket | include SSL|DTLS
    SSL       00185038  LISTEN     172.16.0.250:443    0.0.0.0:*
    SSL       00188638  LISTEN     10.0.0.250:443      0.0.0.0:*
    DTLS      0018f7a8  LISTEN     10.0.0.250:443      0.0.0.0:*

The customer can also check the show asp table socket stats protocol ssl command
to list the underlying SSL system statistics. The SSL statistics indicate the
number of each type of message received and is further verification that the ASA
device is vulnerable.

    ciscoasa# show asp table socket stats protocol ssl
    NP SSL System Stats:
      Handshake Started:          83
      Handshake Complete:         60
      SSL Open:                    7
      SSL Close:                 285
      SSL Server:                 84
      SSL Server Verify:           0
      SSL Client:                  0

Note: While certain IKEv2 feature sets do not enable the underlying SSL TCP
listening socket, they may still be vulnerable. Customers can use the CLI
command show running-config crypto ikev2 to check if the configuration command
crypto ikev2 enable is present in the configuration.

    ciscoasa# show running-config crypto ikev2 | include enable
    crypto ikev2 enable Outside

If a command like crypto ikev2 enable is present in the running configuration
and the command anyconnect enable is part of the global webvpn configuration,
the ASA device is also considered vulnerable.

Determining the ASA Running Software Release

To determine whether a vulnerable release of Cisco ASA Software is running on a
device, administrators can use the show version command in the CLI. The
following example shows the output of the command for a device that is running
Cisco ASA Software Release 9.2(1):

    ciscoasa# show version | include Version
    Cisco Adaptive Security Appliance Software Version 9.2(1)
    Device Manager Version 7.4(1)

Customers who use Cisco Adaptive Security Device Manager (ASDM) to manage
devices can locate the software release in the table that appears in the login
window or the upper-left corner of the Cisco ASDM window.

FTD Software

This vulnerability applies to all FTD releases before the first fixed software
release. The FTD release contains both Firepower and ASA code. Please review the
Firepower Threat Defense Devices section in the Cisco Firepower Compatibility
Guide for additional information.

In the following table, the left column lists the vulnerable Cisco FTD features.
The right column indicates the vulnerable configuration from the CLI command
show running-config, if it can be determined.

+--------------------------------+--------------------------------------------------------------------+
| Feature                        | Vulnerable Configuration                                           |
+================================+====================================================================+
| HTTP Service enabled1          | http server enable <port #>                                        |
|                                |                                                                    |
|                                | http <remote_ip_address> <remote_subnet_mask> <interface_name>     |
+--------------------------------+--------------------------------------------------------------------+
| AnyConnect IKEv2               | crypto ikev2 enable <interface_name> client-services port <port #> |
| Remote Access                  |                                                                    |
| (with client services)^2,^3    | webvpn                                                             |
|                                |                                                                    |
|                                | anyconnect enable                                                  |
+--------------------------------+--------------------------------------------------------------------+
| AnyConnect IKEv2               | crypto ikev2 enable <interface_name>                               |
| Remote Access                  |                                                                    |
| (without client services)^2,^3 | webvpn                                                             |
|                                |                                                                    |
|                                | anyconnect enable                                                  |
+--------------------------------+--------------------------------------------------------------------+
| AnyConnect SSL VPN^2,^3        | webvpn                                                             |
|                                |                                                                    |
|                                | enable <interface_name>                                            |
+--------------------------------+--------------------------------------------------------------------+
^1 The HTTP feature is enabled via Firepower Threat Defense Platform Settings >
HTTP on the Firepower Management Console (FMC).
^2 Remote Access VPN features are enabled via Devices > VPN > Remote Access on
the FMC or via Device > Remote Access VPN on the Firepower Device Manager (FDM).
^3 Remote Access VPN features are first supported as of software release 6.2.2.

The customer can also use the show asp table socket | include SSL|DTLS command
and look for an SSL or a DTLS listen socket on any TCP port. If either socket is
present in the output and the FTD device is configured for one or more of the
features listed in the above table, the device is considered vulnerable. The
following example shows an FTD device with SSL and DTLS listen sockets:

    firepower# show asp table socket | include SSL|DTLS
    SSL       01ffb648  LISTEN     1.1.1.1:443         0.0.0.0:*
    DTLS      00009438  LISTEN     1.1.1.1:443         0.0.0.0:*

The customer can also check the show asp table socket stats protocol ssl command
to list the underlying SSL system statistics. The SSL statistics indicate the
number of each type of message received and is further verification that the FTD
device is vulnerable.

    firepower# show asp table socket stats protocol ssl
    NP SSL System Stats:
      Handshake Started:          44
      Handshake Complete:         42
      SSL Open:                    2
      SSL Close:                  77
      SSL Server:                 45
      SSL Server Verify:           0
      SSL Client:                  0

Note: While certain IKEv2 feature sets do not enable the underlying SSL TCP
listening socket, they may still be vulnerable. Customers can use the CLI
command show running-config crypto ikev2 to check if the configuration command
crypto ikev2 enable is present in the configuration.

    firepower# show running-config crypto ikev2 | include enable
    crypto ikev2 enable Outside

If a command like crypto ikev2 enable is present in the running configuration
and the command anyconnect enable is part of the global webvpn configuration,
the FTD device is also considered vulnerable.

Determining the Running FTD Software Release

Administrators can use the show version command in the CLI to determine the FTD
release. In this example, the device is running software release 6.2.2:

    > show version
    ---------------------[ ftd ]---------------------
    Model : Cisco ASA5525-X Threat Defense (75) Version 6.2.2 (Build 362)
    UUID : 2849ba3c-ecb8-11e6-98ca-b9fc2975893c
    Rules update version : 2017-03-15-001-vrt
    VDB version : 279
    ----------------------------------------------------

Products Confirmed Not Vulnerable

Cisco has confirmed that the AnyConnect Secure Mobility Client is not
vulnerable.

No other Cisco products are currently known to be affected by this
vulnerability.


Workarounds

There are no workarounds that address all the features that are affected by this
vulnerability. The management access to the security appliance can be restricted
to known, trusted hosts using the CLI command http <remote_ip_address>
<remote_subnet_mask> <interface_name>. Please refer to the Enable HTTP Service
section in the Cisco Guide to Harden Cisco ASA Firewall for further information.


Fixed Software

Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support for
software versions and feature sets for which they have purchased a license. By
installing, downloading, accessing, or otherwise using such software upgrades,
customers agree to follow the terms of the Cisco software license:
http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html

Additionally, customers may only download software for which they have a valid
license, procured from Cisco directly, or through a Cisco authorized reseller or
partner. In most cases this will be a maintenance upgrade to software that was
previously purchased. Free security software updates do not entitle customers to
a new software license, additional software feature sets, or major revision
upgrades.

When considering software upgrades, customers are advised to regularly consult
the advisories for Cisco products, which are available from the Cisco Security
Advisories and Alerts page, to determine exposure and a complete upgrade
solution.

In all cases, customers should ensure that the devices to upgrade contain
sufficient memory and confirm that current hardware and software configurations
will continue to be supported properly by the new release. If the information is
not clear, customers are advised to contact the Cisco Technical Assistance
Center (TAC) or their contracted maintenance providers.

Customers Without Service Contracts

Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but are
unsuccessful in obtaining fixed software through their point of sale should
obtain upgrades by contacting the Cisco TAC:
http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html

Customers should have the product serial number available and be prepared to
provide the URL of this advisory as evidence of entitlement to a free upgrade.


Fixed Releases

In the following tables, the left column lists major releases of Cisco ASA
Software. The right column indicates whether a major release is affected by the
vulnerability described in this advisory and the first release that includes the
fix for this vulnerability. Customers should upgrade to an appropriate release
as indicated in this section.

+-------------------------+-------------------------------+
| Cisco ASA Major Release | First Fixed Release           |
+=========================+===============================+
| 8.x^1                   | Affected; migrate to 9.1.7.23 |
+-------------------------+-------------------------------+
| 9.0^1                   | Affected; migrate to 9.1.7.23 |
+-------------------------+-------------------------------+
| 9.1                     | 9.1.7.23                      |
+-------------------------+-------------------------------+
| 9.2                     | 9.2.4.27                      |
+-------------------------+-------------------------------+
| 9.3^1                   | Affected; migrate to 9.4.4.16 |
+-------------------------+-------------------------------+
| 9.4                     | 9.4.4.16                      |
+-------------------------+-------------------------------+
| 9.5^1                   | Affected; migrate to 9.6.4.3  |
+-------------------------+-------------------------------+
| 9.6                     | 9.6.4.3                       |
+-------------------------+-------------------------------+
| 9.7                     | 9.7.1.21                      |
+-------------------------+-------------------------------+
| 9.8                     | 9.8.2.20                      |
+-------------------------+-------------------------------+
| 9.9                     | 9.9.1.2                       |
+-------------------------+-------------------------------+

^1 ASA Software releases prior to 9.1, including all 8.x releases, and ASA
releases 9.3 and 9.5 have reached End of Software Maintenance. Customers should
migrate to a supported release.

The software is available for download from Cisco Software Center by navigating
to Products > Security > Firewalls > Adaptive Security Appliances (ASA) > ASA
5500-X Series Firewalls where there is a list of ASA hardware platforms. The
majority of these software releases are listed under Interim.

FTD Software

In the following table, the left column lists major releases of Cisco FTD
Software. The right column indicates whether a major release is affected by the
vulnerability described in this advisory and the first release that includes the
fix for this vulnerability. Customers should upgrade to an appropriate release
as indicated in this section. The FTD software images will be posted as they
become available.

+----------------+----------------------------------------------------+
| Cisco FTD      | First Fixed Release                                |
| Major Release  |                                                    |
+----------------+----------------------------------------------------+
| 6.0.0          | Affected; migrate to 6.0.1 HotFix or later         |
+----------------+----------------------------------------------------+
|                | Cisco_FTD_Hotfix_BH-6.0.1.5-1.sh (All FTD hardware |
| 6.0.1          | platforms except 41xx and 9300)                    |
|                | Cisco_FTD_SSP_Hotfix_BH-6.0.1.5-1.sh (41xx and     |
|                | 9300 FTD hardware platform)                        |
+----------------+----------------------------------------------------+
|                | Cisco_FTD_Hotfix_DZ-6.1.0.7-1.sh (All FTD hardware |
| 6.1.0          | platforms except 41xx and 9300)                    |
|                | Cisco_FTD_SSP_Hotfix_DZ-6.1.0.7-1.sh (41xx and     |
|                | 9300 FTD hardware platform)                        |
+----------------+----------------------------------------------------+
|                | Cisco_FTD_Hotfix_BN-6.2.0.5-3.sh (All FTD hardware |
| 6.2.0          | platforms except 41xx and 9300)                    |
|                | Cisco_FTD_SSP_Hotfix_BN-6.2.0.5-3.sh (41xx and     |
|                | 9300 FTD hardware platform)                        |
+----------------+----------------------------------------------------+
| 6.2.1          | Affected; migrate to 6.2.2 HotFix                  |
+----------------+----------------------------------------------------+
|                | Cisco_FTD_SSP_FP2K_Hotfix_AN-6.2.2.2-4.sh.REL.tar  |
|                | (21xx FTD hardware platform)                       |
| 6.2.2          | Cisco_FTD_SSP_Hotfix_AO-6.2.2.2-1.sh.REL.tar (41xx |
|                | and 9300 FTD hardware platforms)                   |
|                | Cisco_FTD_Hotfix_AO-6.2.2.2-1.sh.REL.tar (All      |
|                | other FTD hardware platforms)                      |
+----------------+----------------------------------------------------+

The software is available for download from Cisco Software Center by navigating
to Products > Security > Firewalls> Next-Generation Firewalls (NGFW) where there
is a list of possible FTD hardware platforms.


Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is aware of public
knowledge of the vulnerability that is described in this advisory. Cisco PSIRT
is aware of attempted malicious use of the vulnerability described in this
advisory.


Source

Cisco would like to thank Cedric Halbronn from the NCC Group for finding and
reporting this vulnerability.


URL

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180129-asa1


Revision History

+---------+-------------------+---------------+--------+------------------+
| Version |    Description    |    Section    | Status |       Date       |
+---------+-------------------+---------------+--------+------------------+
|         | Corrected         |               |        |                  |
|         | required config   |               |        |                  |
|         | for MUS feature;  |               |        |                  |
|         | further clarified | Vulnerable    |        |                  |
|         | the vulnerable    | Products,     |        |                  |
| 2.2     | FTD configuration | Exploitation  | Final  | 2018-February-07 |
|         | in order for the  | and Public    |        |                  |
|         | vulnerability to  | Announcements |        |                  |
|         | be exploited;     |               |        |                  |
|         | updated on        |               |        |                  |
|         | attempted         |               |        |                  |
|         | malicious use.    |               |        |                  |
+---------+-------------------+---------------+--------+------------------+
|         | Updates to which  |               |        |                  |
|         | FTD release       | Fixed         |        |                  |
| 2.1     | relates to which  | Software      | Final  | 2018-February-05 |
|         | FTD hardware      |               |        |                  |
|         | platform.         |               |        |                  |
+---------+-------------------+---------------+--------+------------------+
|         | Updates to the    | Summary,      |        |                  |
|         | type of attack    | Vulnerable    |        |                  |
|         | vectors that can  | Products,     |        |                  |
|         | exploit this      | Products      |        |                  |
| 2.0     | vulnerability and | Confirmed Not | Final  | 2018-February-05 |
|         | changes to the    | Vulnerable,   |        |                  |
|         | fixed software    | Workarounds,  |        |                  |
|         | releases.         | and Fixed     |        |                  |
|         |                   | Software      |        |                  |
+---------+-------------------+---------------+--------+------------------+
|         | Further clarified |               |        |                  |
|         | the vulnerable    |               |        |                  |
| 1.3     | ASA configuration | Vulnerable    | Final  | 2018-January-30  |
|         | in order for the  | Products      |        |                  |
|         | vulnerability to  |               |        |                  |
|         | be exploited.     |               |        |                  |
+---------+-------------------+---------------+--------+------------------+
|         | Updated the First |               |        |                  |
|         | Fixed Release     |               |        |                  |
|         | table with        |               |        |                  |
|         | information on    |               |        |                  |
|         | the 8.x code      | Fixed         |        |                  |
| 1.2     | train and         | Software      | Final  | 2018-January-29  |
|         | corrected the     |               |        |                  |
|         | First Fixed       |               |        |                  |
|         | Release           |               |        |                  |
|         | information for   |               |        |                  |
|         | 9.9.              |               |        |                  |
+---------+-------------------+---------------+--------+------------------+
|         | Clarified that    |               |        |                  |
|         | Cisco PSIRT is    |               |        |                  |
|         | not aware of any  | Exploitation  |        |                  |
| 1.1     | malicious use of  | and Public    | Final  | 2018-January-29  |
|         | the vulnerability | Announcements |        |                  |
|         | described in this |               |        |                  |
|         | advisory.         |               |        |                  |
+---------+-------------------+---------------+--------+------------------+
| 1.0     | Initial public    | -             | Final  | 2018-January-29  |
|         | release.          |               |        |                  |
+---------+-------------------+---------------+--------+------------------+


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