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Category:   Application (Generic)  >   Libxml2 Vendors:   xmlsoft.org
(Red Hat Issues Fix) Libxml2 Multiple Flaws Let Remote Users Deny Service and Cause Other Unspecified Impacts
SecurityTracker Alert ID:  1034299
SecurityTracker URL:  http://securitytracker.com/id/1034299
CVE Reference:   CVE-2015-1819, CVE-2015-5312, CVE-2015-7497, CVE-2015-7498, CVE-2015-7499, CVE-2015-7500, CVE-2015-7941, CVE-2015-7942, CVE-2015-8241, CVE-2015-8242, CVE-2015-8317   (Links to External Site)
Date:  Dec 7 2015
Impact:   Denial of service via network, Not specified
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.9.3
Description:   Multiple vulnerabilities were reported in Libxml2. A remote user can cause denial of service conditions on the target system. The impact of some vulnerabilities was not specified.

A remote user can supply specially crafted XML data to trigger an XML entity expansion flaw in the xmlreader and consume excessive memory on the target system [CVE-2015-1819].

A buffer overread may occur in the HTML parse in the XML parser [CVE-2015-8241].

A buffer overread may occur in the HTML parse in push mode [CVE-2015-8242].

A memory access error may occur in handling incorrect entity boundaries [CVE-2015-7500].

Some parser errors may occur [CVE-2015-7499].

An entity expansion flaw may occur [CVE-2015-5312].

A heap overflow may occur in xmlDictComputeFastQKey() [CVE-2015-7497].

Processing of entities may occur after encoding conversion failures have occured [CVE-2015-7498]

An error may occur in XZ compression support [CVE-2015-8035].

Errors may occur in the cleanup of condition error handling and on parsing entity boundary errors [CVE-2015-7941].

A previous patch to correct an error in Conditional sections contained an overflow error [CVE-2015-7942].

An out-of-bounds heap read access error may occur [CVE-2015-8317].

Daniel Veillard, David Drysdale, and Hugh Davenport reported these vulnerabilities.

Impact:   A remote user can cause denial of service conditions.

The impact of some vulnerabilities was not specified.

Solution:   Red Hat has issued a fix for CVE-2015-1819, CVE-2015-5312, CVE-2015-7497, CVE-2015-7498, CVE-2015-7499, CVE-2015-7500, CVE-2015-7941, CVE-2015-7942, CVE-2015-8241, CVE-2015-8242, and CVE-2015-8317.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-2550.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-2550.html (Links to External Site)
Cause:   Access control error, Boundary error, Not specified
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  7

Message History:   This archive entry is a follow-up to the message listed below.
Nov 25 2015 Libxml2 Multiple Flaws Let Remote Users Deny Service and Cause Other Unspecified Impacts



 Source Message Contents

Subject:  [RHSA-2015:2550-01] Moderate: libxml2 security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: libxml2 security update
Advisory ID:       RHSA-2015:2550-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-2550.html
Issue date:        2015-12-07
CVE Names:         CVE-2015-1819 CVE-2015-5312 CVE-2015-7497 
                   CVE-2015-7498 CVE-2015-7499 CVE-2015-7500 
                   CVE-2015-7941 CVE-2015-7942 CVE-2015-8241 
                   CVE-2015-8242 CVE-2015-8317 
=====================================================================

1. Summary:

Updated libxml2 packages that fix multiple security issues are now
available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

2. 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 Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

The libxml2 library is a development toolbox providing the implementation
of various XML standards.

Several denial of service flaws were found in libxml2, a library providing
support for reading, modifying, and writing XML and HTML files. A remote
attacker could provide a specially crafted XML or HTML file that, when
processed by an application using libxml2, would cause that application to
use an excessive amount of CPU, leak potentially sensitive information, or
in certain cases crash the application. (CVE-2015-1819, CVE-2015-5312,
CVE-2015-7497, CVE-2015-7498, CVE-2015-7499, CVE-2015-7500 CVE-2015-7941,
CVE-2015-7942, CVE-2015-8241, CVE-2015-8242, CVE-2015-8317, BZ#1213957,
BZ#1281955)

Red Hat would like to thank the GNOME project for reporting CVE-2015-7497,
CVE-2015-7498, CVE-2015-7499, CVE-2015-7500, CVE-2015-8241, CVE-2015-8242,
and CVE-2015-8317. Upstream acknowledges Kostya Serebryany of Google as the
original reporter of CVE-2015-7497, CVE-2015-7498, CVE-2015-7499, and
CVE-2015-7500; Hugh Davenport as the original reporter of CVE-2015-8241 and
CVE-2015-8242; and Hanno Boeck as the original reporter of CVE-2015-8317.
The CVE-2015-1819 issue was discovered by Florian Weimer of Red Hat
Product Security.

All libxml2 users are advised to upgrade to these updated packages, which
contain a backported patch to correct these issues. The desktop must be
restarted (log out, then log back in) for this update to take effect.

4. 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

5. Bugs fixed (https://bugzilla.redhat.com/):

1211278 - CVE-2015-1819 libxml2: denial of service processing a crafted XML document
1213957 - libxml2: out-of-bounds memory access when parsing an unclosed HTML comment
1274222 - CVE-2015-7941 libxml2: Out-of-bounds memory access
1276297 - CVE-2015-7942 libxml2: heap-based buffer overflow in xmlParseConditionalSections()
1276693 - CVE-2015-5312 libxml2: CPU exhaustion when processing specially crafted XML input
1281862 - CVE-2015-7497 libxml2: Heap-based buffer overflow in xmlDictComputeFastQKey
1281879 - CVE-2015-7498 libxml2: Heap-based buffer overflow in xmlParseXmlDecl
1281925 - CVE-2015-7499 libxml2: Heap-based buffer overflow in xmlGROW
1281930 - CVE-2015-8317 libxml2: Out-of-bounds heap read when parsing file with unfinished xml declaration
1281936 - CVE-2015-8241 libxml2: Buffer overread with XML parser in xmlNextChar
1281943 - CVE-2015-7500 libxml2: Heap buffer overflow in xmlParseMisc
1281950 - CVE-2015-8242 libxml2: Buffer overread with HTML parser in push mode in xmlSAX2TextNode
1281955 - libxml2: Multiple out-of-bounds reads in xmlDictComputeFastKey.isra.2 and xmlDictAddString.isra.O

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
libxml2-2.9.1-6.el7_2.2.src.rpm

x86_64:
libxml2-2.9.1-6.el7_2.2.i686.rpm
libxml2-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.i686.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-python-2.9.1-6.el7_2.2.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
libxml2-debuginfo-2.9.1-6.el7_2.2.i686.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-devel-2.9.1-6.el7_2.2.i686.rpm
libxml2-devel-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-static-2.9.1-6.el7_2.2.i686.rpm
libxml2-static-2.9.1-6.el7_2.2.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
libxml2-2.9.1-6.el7_2.2.src.rpm

x86_64:
libxml2-2.9.1-6.el7_2.2.i686.rpm
libxml2-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.i686.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-python-2.9.1-6.el7_2.2.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
libxml2-debuginfo-2.9.1-6.el7_2.2.i686.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-devel-2.9.1-6.el7_2.2.i686.rpm
libxml2-devel-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-static-2.9.1-6.el7_2.2.i686.rpm
libxml2-static-2.9.1-6.el7_2.2.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
libxml2-2.9.1-6.el7_2.2.src.rpm

aarch64:
libxml2-2.9.1-6.el7_2.2.aarch64.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.aarch64.rpm
libxml2-devel-2.9.1-6.el7_2.2.aarch64.rpm
libxml2-python-2.9.1-6.el7_2.2.aarch64.rpm

ppc64:
libxml2-2.9.1-6.el7_2.2.ppc.rpm
libxml2-2.9.1-6.el7_2.2.ppc64.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.ppc.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.ppc64.rpm
libxml2-devel-2.9.1-6.el7_2.2.ppc.rpm
libxml2-devel-2.9.1-6.el7_2.2.ppc64.rpm
libxml2-python-2.9.1-6.el7_2.2.ppc64.rpm

ppc64le:
libxml2-2.9.1-6.el7_2.2.ppc64le.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.ppc64le.rpm
libxml2-devel-2.9.1-6.el7_2.2.ppc64le.rpm
libxml2-python-2.9.1-6.el7_2.2.ppc64le.rpm

s390x:
libxml2-2.9.1-6.el7_2.2.s390.rpm
libxml2-2.9.1-6.el7_2.2.s390x.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.s390.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.s390x.rpm
libxml2-devel-2.9.1-6.el7_2.2.s390.rpm
libxml2-devel-2.9.1-6.el7_2.2.s390x.rpm
libxml2-python-2.9.1-6.el7_2.2.s390x.rpm

x86_64:
libxml2-2.9.1-6.el7_2.2.i686.rpm
libxml2-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.i686.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-devel-2.9.1-6.el7_2.2.i686.rpm
libxml2-devel-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-python-2.9.1-6.el7_2.2.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

aarch64:
libxml2-debuginfo-2.9.1-6.el7_2.2.aarch64.rpm
libxml2-static-2.9.1-6.el7_2.2.aarch64.rpm

ppc64:
libxml2-debuginfo-2.9.1-6.el7_2.2.ppc.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.ppc64.rpm
libxml2-static-2.9.1-6.el7_2.2.ppc.rpm
libxml2-static-2.9.1-6.el7_2.2.ppc64.rpm

ppc64le:
libxml2-debuginfo-2.9.1-6.el7_2.2.ppc64le.rpm
libxml2-static-2.9.1-6.el7_2.2.ppc64le.rpm

s390x:
libxml2-debuginfo-2.9.1-6.el7_2.2.s390.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.s390x.rpm
libxml2-static-2.9.1-6.el7_2.2.s390.rpm
libxml2-static-2.9.1-6.el7_2.2.s390x.rpm

x86_64:
libxml2-debuginfo-2.9.1-6.el7_2.2.i686.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-static-2.9.1-6.el7_2.2.i686.rpm
libxml2-static-2.9.1-6.el7_2.2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
libxml2-2.9.1-6.el7_2.2.src.rpm

x86_64:
libxml2-2.9.1-6.el7_2.2.i686.rpm
libxml2-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.i686.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-devel-2.9.1-6.el7_2.2.i686.rpm
libxml2-devel-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-python-2.9.1-6.el7_2.2.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
libxml2-debuginfo-2.9.1-6.el7_2.2.i686.rpm
libxml2-debuginfo-2.9.1-6.el7_2.2.x86_64.rpm
libxml2-static-2.9.1-6.el7_2.2.i686.rpm
libxml2-static-2.9.1-6.el7_2.2.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/

7. References:

https://access.redhat.com/security/cve/CVE-2015-1819
https://access.redhat.com/security/cve/CVE-2015-5312
https://access.redhat.com/security/cve/CVE-2015-7497
https://access.redhat.com/security/cve/CVE-2015-7498
https://access.redhat.com/security/cve/CVE-2015-7499
https://access.redhat.com/security/cve/CVE-2015-7500
https://access.redhat.com/security/cve/CVE-2015-7941
https://access.redhat.com/security/cve/CVE-2015-7942
https://access.redhat.com/security/cve/CVE-2015-8241
https://access.redhat.com/security/cve/CVE-2015-8242
https://access.redhat.com/security/cve/CVE-2015-8317
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2015 Red Hat, Inc.
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