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Red Hat: RHSA-2012:0731-01 Moderate: Expat DoS and Memory Leak

red hat
Calendar Grey June 13, 2012
Dist Redhat Esm H88
Critical patch released for CentOS expat module, resolving vulnerabilities related to DoS attacks and memory management. Upgrading is advised.
Updated expat packages that fix two security issues are now available for Red Hat Enterprise Linux 5 and 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/articles/11258

Summary

Expat is a C library written by James Clark for parsing XML documents.
A denial of service flaw was found in the implementation of hash arrays in Expat. An attacker could use this flaw to make an application using Expat consume an excessive amount of CPU time by providing a specially-crafted XML file that triggers multiple hash function collisions. To mitigate this issue, randomization has been added to the hash function to reduce the chance of an attacker successfully causing intentional collisions. (CVE-2012-0876)
A memory leak flaw was found in Expat. If an XML file processed by an application linked against Expat triggered a memory re-allocation failure, Expat failed to free the previously allocated memory. This could cause the application to exit unexpectedly or crash when all available memory is exhausted. (CVE-2012-1148)
All Expat users should upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, applications using the Expat library must be restarted for the update to take effect.

Topics%20covered

Topics Covered

security advisory moderate denial of service red hat memory leak expat

References

https://access.redhat.com/security/cve/CVE-2012-0876 https://access.redhat.com/security/cve/CVE-2012-1148 https://access.redhat.com/security/updates/classification#moderate

Package List

Red Hat Enterprise Linux Desktop (v. 5 client):
Source:
i386: expat-1.95.8-11.el5_8.i386.rpm expat-debuginfo-1.95.8-11.el5_8.i386.rpm
x86_64: expat-1.95.8-11.el5_8.i386.rpm expat-1.95.8-11.el5_8.x86_64.rpm expat-debuginfo-1.95.8-11.el5_8.i386.rpm expat-debuginfo-1.95.8-11.el5_8.x86_64.rpm
RHEL Desktop Workstation (v. 5 client):
Source:
i386: expat-debuginfo-1.95.8-11.el5_8.i386.rpm expat-devel-1.95.8-11.el5_8.i386.rpm
x86_64: expat-debuginfo-1.95.8-11.el5_8.i386.rpm expat-debuginfo-1.95.8-11.el5_8.x86_64.rpm expat-devel-1.95.8-11.el5_8.i386.rpm expat-devel-1.95.8-11.el5_8.x86_64.rpm
Red Hat Enterprise Linux (v. 5 server):
Source:
i386: expat-1.95.8-11.el5_8.i386.rpm expat-debuginfo-1.95.8-11.el5_8.i386.rpm expat-devel-1.95.8-11.el5_8.i386.rpm
ia64: expat-1.95.8-11.el5_8.i386.rpm expat-1.95.8-11.el5_8.ia64.rpm expat-debuginfo-1.95.8-11.el5_8.i386.rpm expat-debuginfo-1.95.8-11.el5_8.ia64.rpm expat-devel-1.95.8-11.el5_8.ia64.rpm
ppc: expat-1.95.8-11.el5_8.ppc.rpm expat-1.95.8-11.el5_8.ppc64.rpm expat-debuginfo-1.95.8-11.el5_8.ppc.rpm expat-debuginfo-1.95.8-11.el5_8.ppc64.rpm expat-devel-1.95.8-11.el5_8.ppc.rpm expat-devel-1.95.8-11.el5_8.ppc64.rpm
s390x: expat-1.95.8-11.el5_8.s390.rpm expat-1.95.8-11.el5_8.s390x.rpm expat-debuginfo-1.95.8-11.el5_8.s390.rpm

Read the Full Advisory


Advisory ID: RHSA-2012:0731-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2012:0731.html
Issue date: 2012-06-13

Topic

Updated expat packages that fix two security issues are now available forRed Hat Enterprise Linux 5 and 6.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. Common Vulnerability Scoring System (CVSS) base scores,which give detailed severity ratings, are available for each vulnerabilityfrom the CVE links in the References section.

Topics%20covered

Topics Covered

security advisory moderate denial of service red hat memory leak expat

Relevant Releases Architectures

RHEL Desktop Workstation (v. 5 client) - i386, x86_64

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

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

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

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64

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

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

Bugs Fixed

786617 - CVE-2012-0876 expat: hash table collisions CPU usage DoS

801648 - CVE-2012-1148 expat: Memory leak in poolGrow

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