RHSA-2005:201 - Security Advisory

Topic

An updated squid package that fixes a denial of service issue is now
available for Red Hat Enterprise Linux 4.

This update has been rated as having moderate 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 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.

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 4 x86_64
• Red Hat Enterprise Linux Server 4 ia64
• Red Hat Enterprise Linux Server 4 i386
• Red Hat Enterprise Linux Workstation 4 x86_64
• Red Hat Enterprise Linux Workstation 4 ia64
• Red Hat Enterprise Linux Workstation 4 i386
• Red Hat Enterprise Linux Desktop 4 x86_64
• Red Hat Enterprise Linux Desktop 4 i386
• Red Hat Enterprise Linux for IBM z Systems 4 s390x
• Red Hat Enterprise Linux for IBM z Systems 4 s390
• Red Hat Enterprise Linux for Power, big endian 4 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