RHSA-2011:0545 - Security Advisory

Topic

An updated squid package that fixes one security issue and two bugs is now
available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having low
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

Description

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

It was found that string comparison functions in Squid did not properly
handle the comparisons of NULL and empty strings. A remote, trusted web
client could use this flaw to cause the squid daemon to crash via a
specially-crafted request. (CVE-2010-3072)

This update also fixes the following bugs:

• A small memory leak in Squid caused multiple "ctx: enter level" messages

to be logged to "/var/log/squid/cache.log". This update resolves the memory
leak. (BZ#666533)

• This erratum upgrades Squid to upstream version 3.1.10. This upgraded

version supports the Google Instant service and introduces various code
improvements. (BZ#639365)

Users of squid should upgrade to this updated package, which resolves these
issues. After installing this update, the squid service will be restarted
automatically.

Solution

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 630444 - CVE-2010-3072 Squid: Denial of service due internal error in string handling (SQUID-2010:3)
• BZ - 639365 - Rebase squid to version 3.1.10
• BZ - 666533 - small memleak in squid-3.1.4

CVEs

• CVE-2010-3072

References

• https://access.redhat.com/security/updates/classification/#low