Apache Traffic Server up to 8.1.10/9.2.4 Chunked Trailer Section request smuggling

Summaryinfo

A vulnerability has been found in Apache Traffic Server up to 8.1.10/9.2.4 and classified as critical. The affected element is an unknown function of the component Chunked Trailer Section Handler. This manipulation causes request smuggling. This vulnerability appears as CVE-2024-35161. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Apache Traffic Server up to 8.1.10/9.2.4 and classified as critical. Affected by this vulnerability is an unknown part of the component Chunked Trailer Section Handler. The manipulation with an unknown input leads to a request smuggling vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Apache Traffic Server forwards malformed HTTP chunked trailer section to origin servers. This can be utilized for request smuggling and may also lead cache poisoning if the origin servers are vulnerable. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.10, from 9.0.0 through 9.2.4. Users can set a new setting (proxy.config.http.drop_chunked_trailers) not to forward chunked trailer section. Users are recommended to upgrade to version 8.1.11 or 9.2.5, which fixes the issue.

It is possible to read the advisory at seclists.org. This vulnerability is known as CVE-2024-35161. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/28/2024).

The vulnerability scanner Nessus provides a plugin with the ID 207853 (Debian dla-3897 : trafficserver - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 8.1.11 or 9.2.5 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (207853). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Apache

Name

• Traffic Server

Version

• 8.1.0
• 8.1.1
• 8.1.2
• 8.1.3
• 8.1.4
• 8.1.5
• 8.1.6
• 8.1.7
• 8.1.8
• 8.1.9
• 8.1.10
• 9.2.0
• 9.2.1
• 9.2.2
• 9.2.3
• 9.2.4

License

• open-source

Website

• Vendor: https://www.apache.org/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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