Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges×

Alerts This Week
Warning Icon 1 461
Alerts This Week
Warning Icon 1 461

Red Hat Enterprise Linux 7 RHSA-2016:1292-01 Urgent Libxml2 Buffer Overflow

red hat
Calendar Grey June 23, 2016
Scroller Redhat
Users of Red Hat are advised to give top priority to an essential libxml2 security patch that fixes multiple security flaws.
An update for libxml2 is now available for Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

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

For the update to take effect, all applications linked to the libxml2 library must be restarted, or the system rebooted.

Summary

The libxml2 library is a development toolbox providing the implementation of various XML standards.
Security Fix(es):
A heap-based buffer overflow flaw was found in the way libxml2 parsed certain crafted XML input. A remote attacker could provide a specially crafted XML file that, when opened in an application linked against libxml2, would cause the application to crash or execute arbitrary code with the permissions of the user running the application. (CVE-2016-1834, CVE-2016-1840)
Multiple denial of service flaws were found in libxml2. A remote attacker could provide a specially crafted XML file that, when processed by an application using libxml2, could cause that application to crash. (CVE-2016-1762, CVE-2016-1833, CVE-2016-1835, CVE-2016-1836, CVE-2016-1837, CVE-2016-1838, CVE-2016-1839, CVE-2016-3627, CVE-2016-3705, CVE-2016-4447, CVE-2016-4448, CVE-2016-4449)

Topics%20covered

Topics Covered

security advisory buffer overflow critical DoS Red Hat Enterprise Linux security impact libxml2

References

https://access.redhat.com/security/cve/CVE-2016-1762 https://access.redhat.com/security/cve/CVE-2016-1833 https://access.redhat.com/security/cve/CVE-2016-1834 https://access.redhat.com/security/cve/CVE-2016-1835 https://access.redhat.com/security/cve/CVE-2016-1836 https://access.redhat.com/security/cve/CVE-2016-1837 https://access.redhat.com/security/cve/CVE-2016-1838 https://access.redhat.com/security/cve/CVE-2016-1839 https://access.redhat.com/security/cve/CVE-2016-1840 https://access.redhat.com/security/cve/CVE-2016-3627 https://access.redhat.com/security/cve/CVE-2016-3705 https://access.redhat.com/security/cve/CVE-2016-4447 https://access.redhat.com/security/cve/CVE-2016-4448 https://access.redhat.com/security/cve/CVE-2016-4449 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux HPC Node (v. 6):
Source: libxml2-2.7.6-21.el6_8.1.src.rpm
x86_64: libxml2-2.7.6-21.el6_8.1.i686.rpm libxml2-2.7.6-21.el6_8.1.x86_64.rpm libxml2-debuginfo-2.7.6-21.el6_8.1.i686.rpm libxml2-debuginfo-2.7.6-21.el6_8.1.x86_64.rpm libxml2-python-2.7.6-21.el6_8.1.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64: libxml2-debuginfo-2.7.6-21.el6_8.1.i686.rpm libxml2-debuginfo-2.7.6-21.el6_8.1.x86_64.rpm libxml2-devel-2.7.6-21.el6_8.1.i686.rpm libxml2-devel-2.7.6-21.el6_8.1.x86_64.rpm libxml2-static-2.7.6-21.el6_8.1.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source: libxml2-2.7.6-21.el6_8.1.src.rpm
i386: libxml2-2.7.6-21.el6_8.1.i686.rpm libxml2-debuginfo-2.7.6-21.el6_8.1.i686.rpm libxml2-devel-2.7.6-21.el6_8.1.i686.rpm libxml2-python-2.7.6-21.el6_8.1.i686.rpm
ppc64: libxml2-2.7.6-21.el6_8.1.ppc.rpm libxml2-2.7.6-21.el6_8.1.ppc64.rpm libxml2-debuginfo-2.7.6-21.el6_8.1.ppc.rpm libxml2-debuginfo-2.7.6-21.el6_8.1.ppc64.rpm libxml2-devel-2.7.6-21.el6_8.1.ppc.rpm libxml2-devel-2.7.6-21.el6_8.1.ppc64.rpm libxml2-python-2.7.6-21.el6_8.1.ppc64.rpm
s390x: libxml2-2.7.6-21.el6_8.1.s390.rpm libxml2-2.7.6-21.el6_8.1.s390x.rpm libxml2-debuginfo-2.7.6-21.el6_8.1.s390.rpm libxml2-debuginfo-2.7.6-21.el6_8.1.s390x.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:1292-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:1292
Issue date: 2016-06-23

Topic

An update for libxml2 is now available for Red Hat Enterprise Linux 6 andRed Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory buffer overflow critical DoS Red Hat Enterprise Linux security impact libxml2

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - 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 (v. 7) - ppc64, ppc64le, s390x, x86_64

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

Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64

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

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

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

Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

Bugs Fixed

1319829 - CVE-2016-3627 libxml2: stack exhaustion while parsing xml files in recovery mode

1332443 - CVE-2016-3705 libxml2: stack overflow before detecting invalid XML file

1338682 - CVE-2016-1833 libxml2: Heap-based buffer overread in htmlCurrentChar

1338686 - CVE-2016-4447 libxml2: Heap-based buffer underreads due to xmlParseName

1338691 - CVE-2016-1835 libxml2: Heap use-after-free in xmlSAX2AttributeNs

1338696 - CVE-2016-1837 libxml2: Heap use-after-free in htmlPArsePubidLiteral and htmlParseSystemiteral

1338700 - CVE-2016-4448 libxml2: Format string vulnerability

1338701 - CVE-2016-4449 libxml2: Inappropriate fetch of entities content

1338702 - CVE-2016-1836 libxml2: Heap use-after-free in xmlDictComputeFastKey

1338703 - CVE-2016-1839 libxml2: Heap-based buffer overread in xmlDictAddString

1338705 - CVE-2016-1838 libxml2: Heap-based buffer overread in xmlPArserPrintFileContextInternal

1338706 - CVE-2016-1840 libxml2: Heap-buffer-overflow in xmlFAParserPosCharGroup

1338708 - CVE-2016-1834 libxml2: Heap-buffer-overflow in xmlStrncat

1338711 - CVE-2016-1762 libxml2: Heap-based buffer-overread in xmlNextChar

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.