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Red Hat: RHSA-2015:2594-01 Moderate: libpng Buffer Overflow Issues

red hat
Calendar Grey December 9, 2015
Scroller Redhat
A recent security patch for Libpng on Red Hat tackles three vulnerabilities classified as moderate and includes essential remediation strategies.
Updated libpng packages that fix three security issues are 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.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Summary

The libpng packages contain a library of functions for creating and manipulating PNG (Portable Network Graphics) image format files.
It was discovered that the png_get_PLTE() and png_set_PLTE() functions of libpng did not correctly calculate the maximum palette sizes for bit depths of less than 8. In case an application tried to use these functions in combination with properly calculated palette sizes, this could lead to a buffer overflow or out-of-bounds reads. An attacker could exploit this to cause a crash or potentially execute arbitrary code by tricking an unsuspecting user into processing a specially crafted PNG image. However, the exact impact is dependent on the application using the library. (CVE-2015-8126, CVE-2015-8472)
An array-indexing error was discovered in the png_convert_to_rfc1123() function of libpng. An attacker could possibly use this flaw to cause an out-of-bounds read by tricking an unsuspecting user into processing a specially crafted PNG image. (CVE-2015-7981)
All libpng users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

Topics%20covered

Topics Covered

security advisory moderate Red Hat buffer overflow libpng image processing out-of-bounds

References

https://access.redhat.com/security/cve/CVE-2015-7981 https://access.redhat.com/security/cve/CVE-2015-8126 https://access.redhat.com/security/cve/CVE-2015-8472 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source: libpng-1.2.49-2.el6_7.src.rpm
i386: libpng-1.2.49-2.el6_7.i686.rpm libpng-debuginfo-1.2.49-2.el6_7.i686.rpm
x86_64: libpng-1.2.49-2.el6_7.i686.rpm libpng-1.2.49-2.el6_7.x86_64.rpm libpng-debuginfo-1.2.49-2.el6_7.i686.rpm libpng-debuginfo-1.2.49-2.el6_7.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386: libpng-debuginfo-1.2.49-2.el6_7.i686.rpm libpng-devel-1.2.49-2.el6_7.i686.rpm libpng-static-1.2.49-2.el6_7.i686.rpm
x86_64: libpng-debuginfo-1.2.49-2.el6_7.i686.rpm libpng-debuginfo-1.2.49-2.el6_7.x86_64.rpm libpng-devel-1.2.49-2.el6_7.i686.rpm libpng-devel-1.2.49-2.el6_7.x86_64.rpm libpng-static-1.2.49-2.el6_7.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: libpng-1.2.49-2.el6_7.src.rpm
x86_64: libpng-1.2.49-2.el6_7.i686.rpm libpng-1.2.49-2.el6_7.x86_64.rpm libpng-debuginfo-1.2.49-2.el6_7.i686.rpm libpng-debuginfo-1.2.49-2.el6_7.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64: libpng-debuginfo-1.2.49-2.el6_7.i686.rpm libpng-debuginfo-1.2.49-2.el6_7.x86_64.rpm libpng-devel-1.2.49-2.el6_7.i686.rpm libpng-devel-1.2.49-2.el6_7.x86_64.rpm libpng-static-1.2.49-2.el6_7.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source: libpng-1.2.49-2.el6_7.src.rpm
i386: libpng-1.2.49-2.el6_7.i686.rpm

Read the Full Advisory


Advisory ID: RHSA-2015:2594-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2015:2594.html
Issue date: 2015-12-09

Topic

Updated libpng packages that fix three security issues are now availablefor Red Hat Enterprise Linux 6.Red Hat Product Security has rated this update as having Moderate securityimpact. Common Vulnerability Scoring System (CVSS) base scores, whichgive detailed severity ratings, are available for each vulnerabilityfrom the CVE links in the References section.

Topics%20covered

Topics Covered

security advisory moderate Red Hat buffer overflow libpng image processing out-of-bounds

Relevant Releases Architectures

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 Server Optional (v. 6) - i386, ppc64, s390x, x86_64

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

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

Bugs Fixed

1276416 - CVE-2015-7981 libpng: Out-of-bounds read in png_convert_to_rfc1123

1281756 - CVE-2015-8126 CVE-2015-8472 libpng: Buffer overflow vulnerabilities in png_get_PLTE/png_set_PLTE functions

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