HTTP response splitting in Cisco AsyncOS for Secure Email Gateway

1) HTTP response splitting

EUVDB-ID: #VU89586

Risk: Medium

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

CVE-ID: CVE-2024-20392

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 software does not correclty process CRLF character sequences in the web-based management API. A remote attacker can send specially crafted request containing CRLF sequence and make the application to send a split HTTP response.

Successful exploitation of the vulnerability may allow an attacker perform cache poisoning attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco AsyncOS for Secure Email Gateway: 15.0 - 15.5

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_asyncos_for_secure_email_gateway:*:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_asyncos_for_secure_email_gateway:15.0:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_asyncos_for_secure_email_gateway:15.5:*:*:*:*:*:*:*

External links

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-http-split-GLrnnOwS

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.