Cisco Web Security Appliance API Framework HTTP Response Header Injection response splitting

Summaryinfo

A vulnerability classified as critical has been found in Cisco Web Security Appliance and Content Security Management Appliance. This vulnerability affects unknown code of the component API Framework. Performing a manipulation as part of HTTP Response results in response splitting (Header Injection). This vulnerability is cataloged as CVE-2020-3117. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Cisco Web Security Appliance and Content Security Management Appliance (Anti-Malware Software) (version now known). This affects some unknown processing of the component API Framework. The manipulation as part of a HTTP Response leads to a response splitting vulnerability (Header Injection). CWE is classifying the issue as CWE-113. The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in the API Framework of Cisco AsyncOS for Cisco Web Security Appliance (WSA) and Cisco Content Security Management Appliance (SMA) could allow an unauthenticated, remote attacker to inject crafted HTTP headers in the web server's response. The vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user to access a crafted URL and receive a malicious HTTP response. A successful exploit could allow the attacker to inject arbitrary HTTP headers into valid HTTP responses sent to a user's browser.

The weakness was shared 09/23/2020 as cisco-sa-20200122-wsa-sma-head as confirmed advisory (Website). The advisory is shared at tools.cisco.com. This vulnerability is uniquely identified as CVE-2020-3117 since 12/12/2019. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/23/2020).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Anti-Malware Software

Vendor

• Cisco

Name

• Content Security Management Appliance
• Web Security Appliance

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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