(RHSA-2013:0685) Moderate: perl security update

Perl is a high-level programming language commonly used for system
administration utilities and web programming.

A heap overflow flaw was found in Perl. If a Perl application allowed
user input to control the count argument of the string repeat operator, an
attacker could cause the application to crash or, potentially, execute
arbitrary code with the privileges of the user running the application.
(CVE-2012-5195)

A denial of service flaw was found in the way Perl’s rehashing code
implementation, responsible for recalculation of hash keys and
redistribution of hash content, handled certain input. If an attacker
supplied specially-crafted input to be used as hash keys by a Perl
application, it could cause excessive memory consumption. (CVE-2013-1667)

It was found that the Perl CGI module, used to handle Common Gateway
Interface requests and responses, incorrectly sanitized the values for
Set-Cookie and P3P headers. If a Perl application using the CGI module
reused cookies values and accepted untrusted input from web browsers, a
remote attacker could use this flaw to alter member items of the cookie or
add new items. (CVE-2012-5526)

It was found that the Perl Locale::Maketext module, used to localize Perl
applications, did not properly handle backslashes or fully-qualified method
names. An attacker could possibly use this flaw to execute arbitrary Perl
code with the privileges of a Perl application that uses untrusted
Locale::Maketext templates. (CVE-2012-6329)

Red Hat would like to thank the Perl project for reporting CVE-2012-5195
and CVE-2013-1667. Upstream acknowledges Tim Brown as the original
reporter of CVE-2012-5195 and Yves Orton as the original reporter of
CVE-2013-1667.

All Perl users should upgrade to these updated packages, which contain
backported patches to correct these issues. All running Perl programs
must be restarted for this update to take effect.