HTTP response splitting vulnerabilities in Apache HTTP Server

Published: 2023-03-07 | Updated: 2024-12-06

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2023-25690 CVE-2023-27522
CWE-ID	CWE-113
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #1 is available.
Vulnerable software	Apache HTTP Server Server applications / Web servers
Vendor	Apache Foundation

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) HTTP response splitting

EUVDB-ID: #VU73107

Risk: Medium

CVSSv4.0: 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:P/U:Green]

CVE-ID: CVE-2023-25690

CWE-ID: CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')

Exploit availability: Yes

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 mod_rewrite and mod_proxy. 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

Apache HTTP Server: 2.4 - 2.4.55

CPE2.3

External links

https://httpd.apache.org/security/vulnerabilities_24.html

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. However, proof of concept for this vulnerability is available.

2) HTTP response splitting

EUVDB-ID: #VU73106