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AUSCERT External Security Bulletin Redistribution
ESB-2022.1495
Cisco Web Security Appliance Stored Cross-Site Scripting Vulnerability
7 April 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Web Security Appliance (WSA)
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2022-20781
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wsa-stored-xss-XPsJghMY
Comment: CVSS (Max): 5.4 CVE-2022-20781 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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Cisco Web Security Appliance Stored Cross-Site Scripting Vulnerability
Priority: Medium
Advisory ID: cisco-sa-wsa-stored-xss-XPsJghMY
First Published: 2022 April 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvz13599
CVE Names: CVE-2022-20781
CWEs: CWE-79
Summary
o A vulnerability in the web-based management interface of Cisco AsyncOS
Software for Cisco Web Security Appliance (WSA) could allow an
authenticated, remote attacker to conduct a stored cross-site scripting
(XSS) attack against a user of the interface of an affected device.
The vulnerability exists because the web-based management interface does
not properly validate user-supplied input. An attacker could exploit this
vulnerability by inserting malicious data into a specific data field in an
affected interface. A successful exploit could allow the attacker to
execute arbitrary script code in the context of the affected interface.
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-wsa-stored-xss-XPsJghMY
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco WSA, both
virtual and hardware versions.
For information about which Cisco software releases were vulnerable at the
time of publication, see the Fixed Software section of this advisory. See
the Details section in the bug ID(s) at the top of this advisory for the
most complete and current information.
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), both virtual and hardware versions
Secure Email and Web Manager, formerly Cisco Content Security
Management Appliance (SMA), both virtual and hardware versions
Attention : Simplifying the Cisco portfolio includes the renaming of
security products under one brand: Cisco Secure. For more information, see
Meet Cisco Secure .
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o 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.
Fixed Releases
At the time of publication, the release information in the following table
(s) was accurate. See the Details section in the bug ID(s) at the top of
this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column
indicates whether a release was affected by the vulnerability described in
this advisory and which release included the fix for this vulnerability.
Cisco AsyncOS Software for Cisco WSA Release First Fixed Release
14.1 and earlier 14.5 (Apr 2022)
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
In most cases, the software can be upgraded over the network by using the
System Upgrade options in the web interface of Cisco WSA. To upgrade a
device by using the web interface, do the following:
1. Choose System Administration > System Upgrade .
2. Click Upgrade Options .
3. Choose Download and Install .
4. Choose a release.
5. In the Upgrade Preparation area, choose the appropriate options.
6. Click Proceed to begin the upgrade. A progress bar displays the status
of the upgrade.
After the upgrade is complete, the device will reboot.
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 This vulnerability was found by Swarnali Chakraborty 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.
Related to This Advisory
o Cross-Site Scripting
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wsa-stored-xss-XPsJghMY
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2022-APR-06 |
+----------+---------------------------+----------+--------+--------------+
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