HTTP response splitting in Cisco Web Security Appliance and Cisco Content Security Management Appliance

1) HTTP response splitting

EUVDB-ID: #VU24673

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 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:cisco_systems:cisco_asyncos_for_web_security_appliances:*:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_content_security_management_appliance:*:*:*:*:*:*:*:*

External links

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

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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