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AUSCERT External Security Bulletin Redistribution
ESB-2021.1895.3
Cisco Products affected by Lasso SAML Implementation vulnerability
1 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Adaptive Security Appliance (ASA) Software
Cisco Content Security Management Appliance (SMA)
Cisco Email Security Appliance (ESA)
Cisco FXOS Software
Cisco Firepower Threat Defense (FTD) Software
Cisco Web Security Appliance (WSA)
Cisco Prime Collaboration Assurance
Publisher: Cisco Systems
Operating System: Cisco
Network Appliance
Impact/Access: Provide Misleading Information -- Existing Account
Unauthorised Access -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-28091
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lasso-saml-jun2021-DOXNRLkD
Revision History: October 1 2021: Cisco investigated and finalised their report
August 10 2021: Updated ASA fixed release availability
June 2 2021: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Lasso SAML Implementation Vulnerability Affecting Cisco Products: June 2021
Priority: High
Advisory ID: cisco-sa-lasso-saml-jun2021-DOXNRLkD
First Published: 2021 JuneN 1 12:30 GMT
Last Updated: 2021 September 30 14:51 GMT
Version 1.4: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvx73154
CVE Names: CVE-2021-28091
CWEs: CWE-269
Summary
o On June 1, 2021, Lasso disclosed a security vulnerability in the Lasso
Security Assertion Markup Language (SAML) Single Sign-On (SSO) library.
This vulnerability could allow an authenticated attacker to impersonate
another authorized user when interacting with an application.
For a description of this vulnerability, see lasso.git NEWS .
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lasso-saml-jun2021-DOXNRLkD
Affected Products
o Cisco investigated its product line to determine which products and
services may be affected by this vulnerability.
The Vulnerable Products section includes Cisco bug IDs for each affected
product. The bugs are accessible through the Cisco Bug Search Tool and
contain additional platform-specific information, including workarounds (if
available) and fixed software releases.
Vulnerable Products
The following table lists Cisco products that are affected by the
vulnerability that is described in this advisory. If a future release date
is indicated for software, the date provided represents an estimate based
on all information known to Cisco as of the Last Updated date at the top of
the advisory. Availability dates are subject to change based on a number of
factors, including satisfactory testing results and delivery of other
priority features and fixes. If no version or date is listed for an
affected component (indicated by a blank field and/or an advisory
designation of Interim), Cisco is continuing to evaluate the fix and will
update the advisory as additional information becomes available. After the
advisory is marked Final, customers should refer to the associated Cisco
bug(s) for further details.
Product Cisco Bug Fixed Release
ID Availability
Network and Content Security Devices
9.8.4.39
(available)
9.12.4.24
Cisco Adaptive Security Appliance (ASA) Software (available)
Affected features: Clientless WebVPN and CSCvx73164 9.14.3
AnyConnect VPN (only when SSO is enabled) (available)
9.15.1.15
(available)
9.16.1.3
(available)
Cisco Content Security Management Appliance 13.8.1-074
(SMA) CSCvx73156 (available)
Affected feature: Web-based management interface 14.0.0-404
(only when SSO is enabled) (available)
Cisco Email Security Appliance (ESA) 14.0.0-692 GD
Affected feature: Web-based management interface CSCvx73154 (available)
(only when SSO is enabled)
2.2.2.149
(available)
2.3.1.216
(available)
2.6.1.230
Cisco FXOS Software CSCvx73164 (available)
2.7.1.143
(available)
2.8.1.152
(available)
2.9.1.143
(available)
Cisco Web Security Appliance (WSA) CSCvx73157 14.0.1-053
(available)
6.4.0.12
(available)
Cisco Firepower Threat Defense (FTD) Software 6.6.5
Affected feature: AnyConnect VPN (only when SSO CSCvx73164 (available)
is enabled) ^1 6.7.0.2
(available)
7.0.0
(available)
Network Management and Provisioning
Cisco Prime Collaboration Assurance CSCvx73162 None planned
1. The AnyConnect VPN is configurable only through FlexConfig for Cisco FTD
releases earlier than Release 6.7.
The Cisco software releases listed in the following table have reached end
of software maintenance . Customers are advised to migrate to a supported
release that includes the fix for this vulnerability.
Cisco Software End-of-Life Releases
9.7 and earlier
ASA Software 9.9
9.10
9.13
FXOS Software 2.4.1
2.7.1
6.0.1 and earlier
FTD Software 6.2.0
6.2.1
6.5
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
products and services:
Network and Content Security Devices
Cisco AMP Virtual Private Cloud Appliance
Network Management and Provisioning
Cisco Prime Collaboration Provisioning
Unified Computing
Cisco UCS B-Series M5 Blade Servers
Cisco UCS C-Series M5 Rack Servers - Managed
Video, Streaming, TelePresence, and Transcoding Devices
Cisco Video Surveillance Media Server
Cisco Video Surveillance Operations Manager
Cisco Vision Dynamic Signage Director
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o For information about fixed software releases , consult the Cisco bugs
identified in the Vulnerable Products section of this advisory.
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.
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 Product Security Incident Response Team (PSIRT) is aware that
proof-of-concept exploit code is available for the vulnerability that is
described in this advisory.
The Cisco PSIRT is not aware of any malicious use of the vulnerability that
is described in this advisory.
Source
o Cisco would like to thank the Best Buy Enterprise Information Protection
team and Sam Tinklenberg for discovering this vulnerability.
Cisco would also like to thank Akamai for bringing this vulnerability to
our attention and working with us on it.
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-lasso-saml-jun2021-DOXNRLkD
Revision History
o +---------+--------------------------+------------+---------+-------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+------------+---------+-------------+
| | Updated the advisory | | | |
| | throughout to reflect | | | |
| | that the investigation | Multiple | | |
| 1.4 | is complete. Updated | sections | Final | 2021-SEP-30 |
| | fixed release | | | |
| | availability | | | |
| | information. | | | |
+---------+--------------------------+------------+---------+-------------+
| 1.3 | Updated ASA fixed | Vulnerable | Interim | 2021-JUN-15 |
| | release availability. | Products | | |
+---------+--------------------------+------------+---------+-------------+
| 1.2 | Updated FTD feature | Vulnerable | Interim | 2021-JUN-09 |
| | impact. | Products | | |
+---------+--------------------------+------------+---------+-------------+
| | Updated availability of | Vulnerable | | |
| 1.1 | first fixed releases for | Products | Interim | 2021-JUN-01 |
| | Cisco FXOS Software. | | | |
+---------+--------------------------+------------+---------+-------------+
| 1.0 | Initial public release. | - | Interim | 2021-JUN-01 |
+---------+--------------------------+------------+---------+-------------+
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