cisco-sa-asa-ftd-crlf-inj-BX9uRwSn: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software WebVPN CRLF Injection Vulnerability
First published: Wed Oct 21 2020(Updated: )
Update from October 22nd, 2020: Cisco has become aware of a new Cisco Adaptive Security Appliance vulnerability that could affect the fixed releases recommended for code trains 9.13 and 9.14 in the Fixed Software section of this advisory. See the Cisco Adaptive Security Appliance Software SSL/TLS Denial of Service Vulnerability for additional information. A vulnerability in the Clientless SSL VPN (WebVPN) of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to inject arbitrary HTTP headers in the responses of the affected system. The vulnerability is due to improper input sanitization. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to conduct a CRLF injection attack, adding arbitrary HTTP headers in the responses of the system and redirecting the user to arbitrary websites. 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-ftd-crlf-inj-BX9uRwSn
Credit: This vulnerability was found during the resolution a Cisco TAC support case
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco ASA Software | =9.14<9.14.1.10=9.13<9.13.1.10=9.12<9.12.3.9=9.10<9.10.1.43=9.9<9.9.2.80=9.8<9.8.4.20=9.7<9.8.4.20>=Earlier than 9.6<=9.6<9.6.4.35 | 9.14.1.10 9.13.1.10 9.12.3.9 9.10.1.43 9.9.2.80 9.8.4.20 9.8.4.20 9.6.4.35 |
| Cisco FTD Software | >=Earlier than 6.3.0=6.3.0<=6.4.0<6.4.0.10 | 6.4.0.10 |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID of this Cisco ASA and FTD vulnerability?
The vulnerability ID is cisco-sa-asa-ftd-crlf-inj-BX9uRwSn.
What is the severity of the Cisco ASA and FTD CRLF Injection vulnerability?
The severity of this vulnerability is medium, with a severity value of 4.7.
Which software versions are affected by this Cisco ASA and FTD vulnerability?
The affected software versions are ASA Software 9.14 up to but excluding 9.14.1.10, 9.13 up to but excluding 9.13.1.10, 9.12 up to but excluding 9.12.3.9, 9.10 up to but excluding 9.10.1.43, 9.9 up to but excluding 9.9.2.80, 9.8 up to but excluding 9.8.4.20, and FTD Software earlier than 6.3.0 up to but excluding 6.4.0.10.
How can I fix the Cisco ASA and FTD CRLF Injection vulnerability?
To fix this vulnerability, users should upgrade to the recommended fixed software versions provided by Cisco in their advisory.
What is the Common Weakness Enumeration (CWE) ID associated with this vulnerability?
The CWE ID associated with this vulnerability is CWE-93.
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- version/cisco asa software/9.9
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- version/cisco asa software/earlier than 9.6
- version/cisco asa software/9.6
- canonical/cisco ftd software
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- version/cisco ftd software/6.3.0
- version/cisco ftd software/6.4.0