Squid 2.x / 3.x < 3.5.17 / 4.x < 4.0.9 cachemgr.cgi RCE
Medium Nessus Plugin ID 91194
SynopsisThe remote proxy server is affected by a remote code execution vulnerability.
DescriptionAccording to its banner, the version of Squid running on the remote host is 2.x or 3.x prior to 3.5.17, or 4.x prior to 4.0.9. It is, therefore, affected by a buffer overflow condition in the cachemgr.cgi tool due to improper validation of user-supplied input when processing the length of content lines in reports by the cachemgr.cgi tool. An unauthenticated, remote attacker can exploit this issue, via specially crafted data in manager reports, to cause a denial of service condition or the execution of arbitrary code.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number. Furthermore, the patch released to address this issue does not update the version given in the banner. If the patch has been applied properly, and the service has been restarted, then consider this to be a false positive.
SolutionUpgrade to Squid version 3.5.17 / 4.0.9 or later. Alternatively, apply the vendor-supplied patch.