Updated squid packages that fix a security issue are now available for Red
Hat Enterprise Linux 2.1, 3, 4 and 5.
This update has been rated as having moderate security impact by the Red
Hat Security Response Team.
Squid is a high-performance proxy caching server for Web clients,
supporting FTP, gopher, and HTTP data objects.
A flaw was found in the way squid manipulated HTTP headers for cached
objects stored in system memory. An attacker could use this flaw to cause a
squid child process to exit. This interrupted existing connections and made
proxy services unavailable. Note: the parent squid process started a new
child process, so this attack only resulted in a temporary denial of
Users of squid are advised to upgrade to these updated packages, which
contain a backported patch to resolve this issue.