An updated squid package that fixes a denial of service issue is now available for CentOS Linux 4. This update has been rated as having moderate security impact by the Red Hat Security Response Team.
Squid is a full-featured Web proxy cache. A bug was found in the way Squid handles fully qualified domain name (FQDN) lookups. A malicious DNS server could crash Squid by sending a carefully crafted DNS response to an FQDN lookup. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2005-0446 to this issue. This erratum also includes two minor patches to the LDAP helpers. One corrects a slight malformation in ldap search requests (although all known LDAP servers accept the requests). The other adds documentation for the -v option to the ldap helpers. Users of Squid should upgrade to this updated package, which contains a backported patch, and is not vulnerable to this issue.