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AUSCERT External Security Bulletin Redistribution
ESB-2020.4102.2
Cisco Secure Web Appliance Privilege Escalation Vulnerability
22 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Secure Web Appliance
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3367
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wsa-prv-esc-nPzWZrQj
Revision History: January 22 2021: Vendor updated fixed software section
November 19 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Secure Web Appliance Privilege Escalation Vulnerability
Priority: High
Advisory ID: cisco-sa-wsa-prv-esc-nPzWZrQj
First Published: 2020 November 18 16:00 GMT
Last Updated: 2021 January 21 14:53 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvs65863
CVE Names: CVE-2020-3367
CWEs: CWE-78
CVSS Score:
5.3 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X
Summary
o A vulnerability in the log subscription subsystem of Cisco AsyncOS for the
Cisco Secure Web Appliance (formerly Web Security Appliance) could allow an
authenticated, local attacker to perform command injection and elevate
privileges to root .
This vulnerability is due to insufficient validation of user-supplied input
for the web interface and CLI. An attacker could exploit this vulnerability
by authenticating to the affected device and injecting scripting commands
in the scope of the log subscription subsystem. A successful exploit could
allow the attacker to execute arbitrary commands on the underlying
operating system and elevate privileges to root .
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-prv-esc-nPzWZrQj
Affected Products
o Vulnerable Products
This vulnerability affects Cisco AsyncOS for the Secure Web Appliance, 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:
Secure Email (formerly Email Security Appliance), both virtual and
hardware appliances
Secure Email and Web Manager (formerly Security Management Appliance),
both virtual and hardware appliances
Details
o 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 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 Secure Web Appliance Major Release First Fixed Release
10.1 and earlier 10.1.5-037
10.5 11.7.2-011
11.5 11.7.2-011
11.7 11.7.2-011
11.8 11.8.2-009
12.0 12.0.2-004
12.5 12.5.1-011
In most cases, the software can be upgraded over the network by using the
System Upgrade options in the web interface of the Secure Web Appliance. 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 This vulnerability was found by Alvaro Gutierrez Quiles 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-wsa-prv-esc-nPzWZrQj
Revision History
o +---------+-----------------------------+----------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+-----------------------------+----------+--------+-------------+
| | Added new fix information | | | |
| | for releases 10.1 and | Fixed | | |
| 1.1 | earlier. Updated the fixed | Software | Final | 2021-JAN-21 |
| | release number for Release | | | |
| | 12.0. | | | |
+---------+-----------------------------+----------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2020-NOV-18 |
+---------+-----------------------------+----------+--------+-------------+
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