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AUSCERT External Security Bulletin Redistribution
ESB-2021.2332.2
Cisco Web Security Appliance Privilege Escalation Vulnerability
10 August 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Web Security Appliance
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1359
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-scr-web-priv-esc-k3HCGJZ
Revision History: August 10 2021: Added a new fixed release
July 8 2021: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Web Security Appliance Privilege Escalation Vulnerability
Priority: High
Advisory ID: cisco-sa-scr-web-priv-esc-k3HCGJZ
First Published: 2021 July 7 16:00 GMT
Last Updated: 2021 July 30 14:10 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvv81569
CVE Names: CVE-2021-1359
CWEs: CWE-112
Summary
o A vulnerability in the configuration management of Cisco AsyncOS for Cisco
Web Security Appliance (WSA) could allow an authenticated, remote attacker
to perform command injection and elevate privileges to root .
This vulnerability is due to insufficient validation of user-supplied XML
input for the web interface. An attacker could exploit this vulnerability
by uploading crafted XML configuration files that contain scripting code to
a vulnerable device. A successful exploit could allow the attacker to
execute arbitrary commands on the underlying operating system and elevate
privileges to root . An attacker would need a valid user account with the
rights to upload configuration files to exploit this vulnerability.
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-scr-web-priv-esc-k3HCGJZ
Affected Products
o Vulnerable Products
This vulnerability affects Cisco AsyncOS for Cisco WSA, both virtual and
hardware appliances.
For information about which Cisco software 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, both virtual and hardware appliances
Content Security Management Appliance, both virtual and hardware
appliances
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 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 Web Security Appliance First Fixed Release
Major Release
11.8 and earlier 11.8.4-004
12.0 12.0.3-005
12.5 12.5.2 ^1
14.0 Not affected.
1. Release 12.5.2 will be a Maintenance Release (MR) a few days after the
publication date of this security advisory.
In most cases, the software can be upgraded over the network by using the
System Upgrade options in the Cisco WSA web interface. 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 the release to upgrade to.
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 reboots.
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 Cisco would like to thank Alvaro Gutierrez of mnemonic 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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-scr-web-priv-esc-k3HCGJZ
Revision History
o +---------+-------------------------+--------------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+-------------------------+--------------+--------+-------------+
| 1.1 | Added a new fixed | Fixed | Final | 2021-JUL-30 |
| | release. | Software | | |
+---------+-------------------------+--------------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2021-JUL-07 |
+---------+-------------------------+--------------+--------+-------------+
- --------------------------END INCLUDED TEXT--------------------
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