An HTTP request smuggling vulnerability in Apache Traffic Server 10.x could allow attackers to bypass security controls by manipulating HTTP/2 to HTTP/1 conversion.

The vulnerability relates to inconsistent interpretation of HTTP requests (CWE-444) caused by incorrect chunked framing of trailers. This flaw is exploitable by unauthenticated remote attackers during the protocol conversion process.

Exploitation of this vulnerability can lead to HTTP request smuggling, which allows attackers to bypass security filters, gain unauthorized access to backend resources, or perform cache poisoning. With a CVSS score of 8.3, this issue poses a substantial risk to the integrity of request processing and data security within the application environment.

Immediate Action: Organizations should check for and apply the latest security patches from the Apache Software Foundation as soon as they are published.

Proactive Monitoring: Monitor logs for anomalous HTTP traffic, particularly requests that involve complex trailer headers or inconsistent protocol handling between HTTP/2 and HTTP/1.

Compensating Controls: Ensure that downstream servers are configured to reject ambiguous or malformed HTTP requests, and utilize WAF rules that normalize HTTP traffic before it reaches the Apache Traffic Server.

Public Exploit Available: Unknown

The risk posed by request smuggling necessitates a proactive approach to patching. IT teams should verify their current version of Apache Traffic Server and prepare for an immediate update to the latest secure release to maintain the integrity of their HTTP traffic processing.