RHSA-2005:173 - Security Advisory

Topic

Updated squid packages that fix a denial of service issue are now available.

This update has been rated as having important security impact by the Red
Hat Security Response Team

Description

Squid is a full-featured Web proxy cache.

A bug was found in the way Squid handles FQDN lookups. It was possible
to crash the Squid server 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.

Users of squid should upgrade to this updated package, which contains a
backported patch, and is not vulnerable to this issue.

Solution

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied. Use Red Hat
Network to download and update your packages. To launch the Red Hat
Update Agent, use the following command:

up2date

For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system:

http://www.redhat.com/docs/manuals/enterprise/

Affected Products

• Red Hat Enterprise Linux Server 3 x86_64
• Red Hat Enterprise Linux Server 3 ia64
• Red Hat Enterprise Linux Server 3 i386
• Red Hat Enterprise Linux Server 2 ia64
• Red Hat Enterprise Linux Server 2 i386
• Red Hat Enterprise Linux Workstation 3 x86_64
• Red Hat Enterprise Linux Workstation 3 ia64
• Red Hat Enterprise Linux Workstation 3 i386
• Red Hat Enterprise Linux Workstation 2 ia64
• Red Hat Enterprise Linux Desktop 3 x86_64
• Red Hat Enterprise Linux Desktop 3 i386
• Red Hat Enterprise Linux for IBM z Systems 3 s390x
• Red Hat Enterprise Linux for IBM z Systems 3 s390
• Red Hat Enterprise Linux for Power, big endian 3 ppc

Fixes

• BZ - 148882 - CAN-2005-0446 Squid DoS from bad DNS response

CVEs

• CVE-2005-0446

References

• http://www.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE8-dns_assert