cisco-sa-asa-ssl-vpn-heap-zLX3FdX: Cisco Adaptive Security Appliance Software Clientless SSL VPN Heap Overflow Vulnerability
First published: Wed Apr 27 2022(Updated: )
A vulnerability in the handler for HTTP authentication for resources accessed through the Clientless SSL VPN portal of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device or to obtain portions of process memory from an affected device. This vulnerability is due to insufficient bounds checking when parsing specific HTTP authentication messages. An attacker could exploit this vulnerability by sending malicious traffic to an affected device acting as a VPN Gateway. To send this malicious traffic, an attacker would need to control a web server that can be accessed through the Clientless SSL VPN portal. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition, or to retrieve bytes from the device process memory that may contain sensitive information. 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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ssl-vpn-heap-zLX3FdX This advisory is part of the April 2022 release of the Cisco ASA, FTD, and FMC Security Advisory Bundled publication. For a complete list of the advisories and links to them, see Cisco Event Response: April 2022 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication.
Credit: Nikita Abramov Positive Technologies
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco ASA Software | =9.17<9.17.1.7=9.16<9.16.2.14=9.15<9.15.1.21>=9.13<=9.14<9.14.4>=9.9=9.10<=9.12<9.12.4.38>=9.7 and earlier<=9.8<9.8.4.44 (June 2022) | 9.17.1.7 9.16.2.14 9.15.1.21 9.14.4 9.12.4.38 9.8.4.44 (June 2022) |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID for this Cisco ASA Software vulnerability?
The vulnerability ID for this Cisco ASA Software vulnerability is cisco-sa-asa-ssl-vpn-heap-zLX3FdX.
What is the severity level of the Cisco ASA Software vulnerability?
The severity level of the Cisco ASA Software vulnerability is high (7.1).
What is the affected software for this vulnerability?
The affected software for this vulnerability is Cisco ASA Software versions 9.17, 9.16, 9.15, 9.14, 9.12, and 9.8.
What is the impact of this vulnerability?
This vulnerability could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device or to obtain portions of device memory.
Is there a fix available for this vulnerability?
Yes, Cisco has provided remediation steps to address this vulnerability. Please refer to the Cisco Security Advisory for more information and instructions.
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