Squid 3.x < 3.5.18 / 4.x < 4.0.10 Multiple Denial of Service Vulnerabilities (SQUID-2016:9)
Medium Nessus Plugin ID 119723
Synopsis
The remote proxy server is affected by multiple denial of service vulnerabilities.
Description
According to its banner, the version of Squid running on the remote host is 3.x prior to 3.5.18, or 4.x prior to 4.0.10. It is, therefore, affected by multiple denial of service (DoS) vulnerabilities in the ESI response processing component due to incorrect pointer handling and reference counting. A remote attacker controlled server can exploit this issue, via crafted ESI responses, to cause a denial of service for all clients accessing the Squid service.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Upgrade to Squid version 3.5.18 or 4.0.10 or later. Alternatively, apply the vendor-supplied patch.