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AUSCERT External Security Bulletin Redistribution
ESB-2019.4175
Cisco Web Security Appliance Unauthorized Device Reset Vulnerability
7 November 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Web Security Appliance
Publisher: Cisco Systems
Operating System: Network Appliance
Impact/Access: Increased Privileges -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-15956
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191106-wsa-unauth-devreset
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Cisco Web Security Appliance Unauthorized Device Reset Vulnerability
Priority: High
Advisory ID: cisco-sa-20191106-wsa-unauth-devreset
First Published: 2019 November 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvp51493
CVE-2019-15956
CWE-284
CVSS Score:
8.8 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the web management interface of Cisco AsyncOS Software
for Cisco Web Security Appliance (WSA) could allow an authenticated, remote
attacker to perform an unauthorized system reset on an affected device.
The vulnerability is due to improper authorization controls for a specific
URL in the web management interface. An attacker could exploit this
vulnerability by sending a crafted HTTP request to an affected device. A
successful exploit could have a twofold impact: the attacker could either
change the administrator password, gaining privileged access, or reset the
network configuration details, causing a denial of service (DoS) condition.
In both scenarios, manual intervention is required to restore normal
operations.
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-20191106-wsa-unauth-devreset
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Web Security Appliance (WSA).
For information about which Cisco WSA releases are vulnerable, see the
Fixed Software section of this advisory.
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 the following
Cisco products:
Email Security Appliance (ESA)
Content Security Management Appliance (SMA)
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 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.
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 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
Customers are advised to upgrade to an appropriate fixed software release
as indicated in the following table:
Cisco AsyncOS for WSA Major Release First Fixed Software Release
10.1 10-1-5-004
10.5 11.5.3-016
11.5 11.5.3-016
11.7 11.7.1-006
11.8 Not vulnerable.
12 Not vulnerable.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found by Sebastian Perez and Alvaro Gutierrez of
Cisco during internal security testing.
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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20191106-wsa-unauth-devreset
Revision History
o +---------+-------------------------+---------+--------+------------------+
| Version | Description | Section | Status | Date |
+---------+-------------------------+---------+--------+------------------+
| 1.0 | Initial public release. | - | Final | 2019-November-06 |
+---------+-------------------------+---------+--------+------------------+
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