HAProxy Header Content-Length request smuggling

Summaryinfo

A vulnerability, which was classified as problematic, has been found in HAProxy. Affected by this issue is some unknown functionality of the component Header Handler. Performing a manipulation of the argument Content-Length results in request smuggling. This vulnerability was named CVE-2023-40225. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in HAProxy (Firewall Software) (affected version unknown). This affects an unknown functionality of the component Header Handler. The manipulation of the argument Content-Length with an unknown input leads to a request smuggling vulnerability. CWE is classifying the issue as CWE-444. The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. This is going to have an impact on integrity. The summary by CVE is:

HAProxy through 2.0.32, 2.1.x and 2.2.x through 2.2.30, 2.3.x and 2.4.x through 2.4.23, 2.5.x and 2.6.x before 2.6.15, 2.7.x before 2.7.10, and 2.8.x before 2.8.2 forwards empty Content-Length headers, violating RFC 9110 section 8.6. In uncommon cases, an HTTP/1 server behind HAProxy may interpret the payload as an extra request.

The weakness was presented 08/11/2023 as 2237. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2023-40225 since 08/10/2023. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 312071 (RHCOS 4 : OpenShift Container Platform 4.11.57 (RHSA-2024:0308)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability. Applying the patch 6492f1f29d738457ea9f382aca54537f35f9d856 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (312071) and EUVD (EUVD-2023-44822). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Firewall Software

Name

• HAProxy

License

• open-source

Website

• Product: https://github.com/haproxy/haproxy/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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