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AUSCERT External Security Bulletin Redistribution
ESB-2022.1913.2
Cisco Adaptive Security Appliance Software and Firepower Threat Defense
Software Web Services Interface Privilege Escalation Vulnerability
18 May 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Adaptive Security Appliance Software
Firepower Threat Defense Software
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2022-20759
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-mgmt-privesc-BMFMUvye
Comment: CVSS (Max): 8.8 CVE-2022-20759 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Revision History: May 18 2022: Fixed broken link in Summary section
April 29 2022: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Adaptive Security Appliance Software and Firepower Threat Defense
Software Web Services Interface Privilege Escalation Vulnerability
Priority: High
Advisory ID: cisco-sa-asaftd-mgmt-privesc-BMFMUvye
First Published: 2022 April 27 16:00 GMT
Last Updated: 2022 May 17 19:37 GMT
Version 1.2: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvz92016
CVE Names: CVE-2022-20759
CWEs: CWE-266
Summary
o A vulnerability in the web services interface for remote access VPN
features of Cisco Adaptive Security Appliance (ASA) Software and Cisco
Firepower Threat Defense (FTD) Software could allow an authenticated, but
unprivileged, remote attacker to elevate privileges to level 15.
This vulnerability is due to improper separation of authentication and
authorization scopes. An attacker could exploit this vulnerability by
sending crafted HTTPS messages to the web services interface of an affected
device. A successful exploit could allow the attacker to gain privilege
level 15 access to the web management interface of the device. This
includes privilege level 15 access to the device using management tools
like the Cisco Adaptive Security Device Manager (ASDM) or the Cisco
Security Manager (CSM).
Note: With Cisco FTD Software, the impact is lower than the CVSS score
suggests because the affected web management interface allows for read
access only.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-mgmt-privesc-BMFMUvye
This advisory is part of the April 2022 release of the Cisco ASA, FTD, and
FMC Security Advisory Bundled publication. For a complete list of the
advisories and links to them, see Cisco Event Response: April 2022 Cisco
ASA, FMC, and FTD Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects Cisco products if they are running a vulnerable
release of Cisco ASA Software or Cisco FTD Software and at least one of
following conditions is true:
HTTPS Management Access and IKEv2 Client Services are both enabled on
at least one (not necessarily the same) interface
HTTPS Management Access and WebVPN are both enabled on at least one
(not necessarily the same) interface
Neither of these features is enabled by default in Cisco ASA Software or
Cisco FTD Software.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine the Device Configuration
Determine the HTTPS Management Access Configuration
To identify the status and port of the HTTPS management access, use the
show running-config http CLI command. The following example shows the
output of the show running-config http command on a device that has HTTPS
management access enabled on the inside and outside interface using TCP
port 8443:
asa# show running-config http
http server enable 8443
http 0.0.0.0 0.0.0.0 inside
http 0.0.0.0 0.0.0.0 outside
If the line starting with http server enable does not include a port, the
default port 443 is used. The exact port value does not affect the
vulnerability status of the device.
If the line starting with http server enable is missing or the output does
not include an HTTP access-control list (ACL) associated with an interface,
the HTTPS management access is disabled.
The exact value of the HTTP ACL does not affect the vulnerability status of
the device. However, for successful exploitation, the attacker has to be
able to connect to the HTTPS management server of the device from an IP
address that is permitted by the HTTP ACL.
Determine the IKEv2 Client Services Configuration
To identify the status and port of the IKEv2 client services, use the show
running-config crypto ikev2 | include port CLI command. The following
example shows the output of the show running-config crypto ikev2 | include
port command on a device that IKEv2 client services enabled on the outside
interface using TCP port 8443:
asa# show running-config crypto ikev2 | include port
crypto ikev2 enable outside client-services port 8443
The exact port value does not affect the vulnerability status of the
device.
If the command output is empty, IKEv2 client services are not enabled.
Determine the WebVPN Configuration
To identify the status and port of WebVPN, use the show running-config all
webvpn | include ^ port |^ enable CLI command. The following example shows
the output of the show running-config all webvpn | include ^ port |^ enable
command on a device that has WebVPN enabled on the outside interface using
TCP port 8443:
asa# show running-config all webvpn | include ^ port |^ enable
port 8443
enable outside
The exact port value does not affect the vulnerability status of the
device.
If the command output is empty output or there is no enable statement,
WebVPN is not enabled.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Firepower
Management Center (FMC) Software.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers with service contracts that entitle
them to regular software updates should obtain security fixes through their
usual update channels.
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:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.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.
The Cisco Support and Downloads page on Cisco.com provides information
about licensing and downloads. This page can also display customer device
support coverage for customers who use the My Devices tool.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
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: https://www.cisco.com/c
/en/us/support/web/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 table(s), the left column lists Cisco software releases.
The center column indicates whether a release is affected by the
vulnerability described in this advisory and the first release that
includes the fix for this vulnerability. The right column indicates whether
a release is affected by any of the Critical or High SIR vulnerabilities
described in this bundle and which release includes fixes for those
vulnerabilities.
ASA Software
Cisco ASA First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
9.7 and Migrate to a fixed Migrate to a fixed release.
earlier ^1 release.
9.8 9.8.4.43 Migrate to a fixed release.
9.9 ^1 Migrate to a fixed Migrate to a fixed release.
release.
9.10 ^1 Migrate to a fixed Migrate to a fixed release.
release.
9.12 9.12.4.38 9.12.4.38
9.13 ^1 Migrate to a fixed Migrate to a fixed release.
release.
9.14 9.14.4 9.14.4
9.15 9.15.1.21 9.15.1.21
9.16 9.16.2.13 9.16.2.14
9.17 9.17.1.7 9.17.7
1. Cisco ASA Software releases 9.7 and earlier as well as releases 9.9,
9.10, and 9.13 have reached end of software maintenance . Customers are
advised to migrate to a supported release that includes the fix for this
vulnerability.
FTD Software
Cisco First Fixed Release for This Vulnerability First Fixed
FTD Release for All
Software Vulnerabilities
Release Described in the
Bundle of
Advisories
6.2.2
and Migrate to a fixed release. Migrate to a
earlier fixed release.
^1
6.2.3 Migrate to a fixed release. Migrate to a
fixed release.
6.3.0 ^1 Migrate to a fixed release. Migrate to a
fixed release.
6.4.0 6.4.0.15 (May 2022) 6.4.0.15 (May
2022)
6.5.0 ^1 Migrate to a fixed release. Migrate to a
fixed release.
6.6.0 6.6.5.2 6.6.5.2
Cisco_FTD_Hotfix_AA-6.7.0.4-2.sh.REL.tar
6.7.0 Cisco_FTD_SSP_FP1K_Hotfix_AA-6.7.0.4-2.sh.REL.tar Migrate to a
Cisco_FTD_SSP_FP2K_Hotfix_AA-6.7.0.4-2.sh.REL.tar fixed release.
Cisco_FTD_SSP_Hotfix_AA-6.7.0.4-2.sh.REL.tar
7.0.0 7.0.2 (May 2022) 7.0.2 (May 2022)
7.1.0 7.1.0.1 7.1.0.1
1. Cisco FMC and FTD Software releases 6.2.2 and earlier, as well as
releases 6.3.0 and 6.5.0, have reached end of software maintenance .
Customers are advised to migrate to a supported release that includes the
fix for this vulnerability.
For instructions on upgrading your FTD device, see Cisco Firepower
Management Center Upgrade Guide .
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco PSIRT is not aware of any public announcements or malicious use
of the vulnerability that is described in this advisory.
Source
o Cisco would like to thank the Orange CERT-CC and SA2 teams for reporting
this vulnerability.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Related to This Advisory
o Cisco Event Response: April 2022 Cisco ASA, FMC, and FTD Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-mgmt-privesc-BMFMUvye
Revision History
o +---------+---------------------------+------------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+---------------------------+------------+--------+-------------+
| 1.2 | Fixed broken link in | Summary | Final | 2022-MAY-17 |
| | Summary section. | | | |
+---------+---------------------------+------------+--------+-------------+
| | Further clarified the | Vulnerable | | |
| 1.1 | conditions for the | Products | Final | 2022-MAY-03 |
| | vulnerable status. | | | |
+---------+---------------------------+------------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2022-APR-27 |
+---------+---------------------------+------------+--------+-------------+
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