Description
Squid 3.1.9 allows remote attackers to bypass the access configuration for the CONNECT method by providing an arbitrary allowed hostname in the Host HTTP header. NOTE: this issue might not be reproducible, because the researcher is unable to provide a squid.conf file for a vulnerable system, and the observed behavior is consistent with a squid.conf file that was (perhaps inadvertently) designed to allow access based on a "req_header Host" acl regex that matches www.uol.com.br
References
- 20120419 RE: Squid URL Filtering Bypass mailing-list
- 20120420 Re: Squid URL Filtering Bypass mailing-list
- 20120418 Re: Squid URL Filtering Bypass mailing-list
- 20120421 Re: Squid URL Filtering Bypass mailing-list
- 20120416 Squid URL Filtering Bypass mailing-list
- 20120419 Re: Squid URL Filtering Bypass mailing-list