CVE-2020-11945

Se detectó un problema en Squid versiones anteriores a 5.0.2. Un atacante remoto puede reproducir un nonce Digest Autenticación rastreado para conseguir acceso a recursos que de otra manera están restringidos. Esto ocurre porque el atacante puede desbordar el contador de referencia nonce (un entero corto). Una ejecución de código remota puede presentarse si las credenciales de token agrupadas son liberadas (en lugar de reproducirse como credenciales validas).

A flaw was found in Squid, where a remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This issue occurs because the attacker can overflow the nonce reference counter, which results in remote code execution if the pooled token credentials are freed.

Jeriko One discovered that Squid incorrectly handled certain Edge Side Includes responses. A malicious remote server could cause Squid to crash, possibly poison the cache, or possibly execute arbitrary code. It was discovered that Squid incorrectly handled the hostname parameter to cachemgr.cgi when certain browsers are used. A remote attacker could possibly use this issue to inject HTML or invalid characters in the hostname parameter. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 19.10. Various other issues were also addressed.