CVE-2011-2767

mod_perl 2.0 through 2.0.10 allows attackers to execute arbitrary Perl code by placing it in a user-owned .htaccess file, because (contrary to the documentation) there is no configuration option that permits Perl code for the administrator's control of HTTP request processing without also permitting unprivileged users to run Perl code in the context of the user account that runs Apache HTTP Server processes.

The default configurations shipped in Red Hat Enterprise Linux 6 and Red Hat Software Collections are not vulnerable to to this flaw. The UserDir option needs to be enabled as well as AllowOverride being set to values other than "None" for this to potentially pose a threat.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Disabling the UserDir directive and also setting AllowOverride None should prevent the processing of perl in user .htaccess files.