Executive Summary

This vulnerability is a CRLF (Carriage Return Line Feed) injection flaw in the libsoup HTTP client library when an HTTP proxy is configured. It happens because the library improperly handles URL-decoded input used to create the Host header. An attacker can exploit this by sending a specially crafted URL containing CRLF sequences, which allows them to inject additional HTTP headers or complete HTTP request bodies into the HTTP request. This can cause the proxy to forward unintended or unauthorized HTTP requests. [1]

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Impact Analysis

Exploitation of this vulnerability can lead to unauthorized or unintended HTTP requests being forwarded by the proxy to downstream services. While it does not directly compromise the client system, it can affect the behavior of services behind the proxy, potentially leading to security issues such as request smuggling or manipulation of HTTP traffic. [1]

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Mitigation Strategies

To mitigate this vulnerability, ensure that any HTTP proxy configurations using libsoup are updated to a version where the CRLF injection flaw is fixed. Avoid processing attacker-controlled URLs through an HTTP proxy with vulnerable libsoup versions. Applying vendor patches or updates that address this issue is recommended to prevent exploitation. [1]

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