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Red Hat: RHSA-2011-1791-01 Moderate: Squid Server Crash Flaw

red hat
Calendar Grey December 6, 2011
Dist Redhat Esm H88
Significant squid security patch rolled out for Red Hat Enterprise Linux 6 addressing a major vulnerability in resource record computations.
An updated squid package that fixes one security issue is now available for Red Hat Enterprise Linux 6

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

Summary

Squid is a high-performance proxy caching server for web clients, supporting FTP, Gopher, and HTTP data objects.
An input validation flaw was found in the way Squid calculated the total number of resource records in the answer section of multiple name server responses. An attacker could use this flaw to cause Squid to crash. (CVE-2011-4096)
Users of squid should upgrade to this updated package, which contains a backported patch to correct this issue. After installing this update, the squid service will be restarted automatically.

Topics%20covered

Topics Covered

security advisory moderate Red Hat squid web proxy crash flaw

References

https://access.redhat.com/security/cve/CVE-2011-4096 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Enterprise Linux Server (v. 6):
Source:
i386: squid-3.1.10-1.el6_2.1.i686.rpm squid-debuginfo-3.1.10-1.el6_2.1.i686.rpm
ppc64: squid-3.1.10-1.el6_2.1.ppc64.rpm squid-debuginfo-3.1.10-1.el6_2.1.ppc64.rpm
s390x: squid-3.1.10-1.el6_2.1.s390x.rpm squid-debuginfo-3.1.10-1.el6_2.1.s390x.rpm
x86_64: squid-3.1.10-1.el6_2.1.x86_64.rpm squid-debuginfo-3.1.10-1.el6_2.1.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
i386: squid-3.1.10-1.el6_2.1.i686.rpm squid-debuginfo-3.1.10-1.el6_2.1.i686.rpm
x86_64: squid-3.1.10-1.el6_2.1.x86_64.rpm squid-debuginfo-3.1.10-1.el6_2.1.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/#package


Advisory ID: RHSA-2011:1791-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:1791.html
Issue date: 2011-12-06

Topic

An updated squid package that fixes one security issue is now available forRed Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.

Topics%20covered

Topics Covered

security advisory moderate Red Hat squid web proxy crash flaw

Relevant Releases Architectures

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Bugs Fixed

750316 - CVE-2011-4096 squid: Invalid free by processing CNAME DNS record pointing to another CNAME record pointing to an empty A-record

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