#VU24673 HTTP response splitting in Cisco AsyncOS for Web Security Appliances and Cisco Content Security Management Appliance - CVE-2020-3117

Vulnerability identifier: #VU24673

Vulnerability risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-3117

CWE-ID: CWE-113

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco AsyncOS for Web Security Appliances
Server applications / IDS/IPS systems, Firewalls and proxy servers
Cisco Content Security Management Appliance
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to perform HTTP splitting attacks.

The vulnerability exists due to insufficient validation of user input in the API Framework. A remote attacker can trick a victim to access a crafted URL, receive a malicious HTTP response and inject arbitrary HTTP headers into valid HTTP responses sent to a user's browser.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco AsyncOS for Web Security Appliances: before 11.8.0 382

Cisco Content Security Management Appliance: before 13.0.0 187

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-wsa-sma-header-inject

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.