CVE-2018-1000027

Name of the Vulnerable Software and Affected Versions Squid HTTP Caching Proxy versions prior to 4.0.23

Description The issue is related to a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing. This can result in Denial of Service to all clients of the proxy. The attack appears to be exploitable via a remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP requests. Additionally, there is an issue with buffer overflow when processing ESI responses or loading intermediate certificate authority certificates, which can also lead to a Denial of Service.

Recommendations For Squid HTTP Caching Proxy versions prior to 4.0.23, update to version 4.0.23 or later to resolve the issue. As a temporary workaround, consider restricting access to the X-Forwarded-For header in HTTP responses until the update is applied.