5 - RHSA-2006:0052

Problem Description:

An updated squid package that fixes a security vulnerability as well as several issues is now available.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64 Red Hat Enterprise Linux Desktop version 4 - i386, x86_64 Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64 Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64

3. Problem description:

Squid is a high-performance proxy caching server for Web clients, supporting FTP, gopher, and HTTP data objects.

A denial of service flaw was found in the way squid processes certain NTLM authentication requests. It is possible for a remote attacker to crash the Squid server by sending a specially crafted NTLM authentication request. The Common Vulnerabilities and Exposures project (cve.mitre.org) assigned the name CVE-2005-2917 to this issue.

The following issues have also been fixed in this update:

* An error introduced in squid-2.5.STABLE6-3.4E.12 can crash Squid when a
user visits a site that has a bit longer DNS record.

* An error introduced in the old package prevented Squid from returning
correct information about large file systems. The new package is compiled
with the IDENT lookup support so that users who want to use it do not
have to recompile it.

* Some authentication helpers needed SETUID rights but did not have them.
If administrators wanted to use cache administrator, they had to change
the SETUID bit manually. The updated package sets this bit so the new
package can be updated without manual intervention from administrators.

* Squid could not handle a reply from an HTTP server when the reply began
with the new-line character.

* An issue was discovered when a reply from an HTTP server was not
HTTP 1.0 or 1.1 compliant.

* The updated package keeps user-defined error pages when the package
is updated and it adds new ones.
All users of squid should upgrade to this updated package, which resolves these issues.

4. 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/

5. Bug IDs fixed (http://bugzilla.redhat.com/):

160704 - squid child processes exit with signal 6.. squid crashes 162660 - pam authentication fails 168378 - CVE-2005-2917 Squid malformed NTLM authentication DoS 170399 - Squid blocks page served by broken server 172375 - Error pages should not be replaced by updates 172392 - One translated Polish language error is missing preventing squid from startup 172697 - Squid doesn't handle headers split across packets