Operating System:

[RedHat]

Published:

30 September 2020

Protect yourself against future threats.

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3364
                    libxml2 security and bug fix update
                             30 September 2020

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libxml2
Publisher:         Red Hat
Operating System:  Red Hat Enterprise Linux Server 7
                   Red Hat Enterprise Linux WS/Desktop 7
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-7595 CVE-2019-20388 CVE-2019-19956

Reference:         ESB-2020.3248
                   ESB-2020.3102

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2020:3996

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

Synopsis:          Moderate: libxml2 security and bug fix update
Advisory ID:       RHSA-2020:3996-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2020:3996
Issue date:        2020-09-29
CVE Names:         CVE-2019-19956 CVE-2019-20388 CVE-2020-7595 
=====================================================================

1. Summary:

An update for libxml2 is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) 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) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - 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.

Security Fix(es):

* libxml2: memory leak in xmlParseBalancedChunkMemoryRecover in parser.c
(CVE-2019-19956)

* libxml2: memory leak in xmlSchemaPreRun in xmlschemas.c (CVE-2019-20388)

* libxml2: infinite loop in xmlStringLenDecodeEntities in some end-of-file
situations (CVE-2020-7595)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.9 Release Notes linked from the References section.

4. 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

The desktop must be restarted (log out, then log back in) for this update
to take effect.

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

1788856 - CVE-2019-19956 libxml2: memory leak in xmlParseBalancedChunkMemoryRecover in parser.c
1799734 - CVE-2019-20388 libxml2: memory leak in xmlSchemaPreRun in xmlschemas.c
1799786 - CVE-2020-7595 libxml2: infinite loop in xmlStringLenDecodeEntities in some end-of-file situations
1812145 - XSD validation fails on xsd:any

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
libxml2-2.9.1-6.el7.5.src.rpm

x86_64:
libxml2-2.9.1-6.el7.5.i686.rpm
libxml2-2.9.1-6.el7.5.x86_64.rpm
libxml2-debuginfo-2.9.1-6.el7.5.i686.rpm
libxml2-debuginfo-2.9.1-6.el7.5.x86_64.rpm
libxml2-python-2.9.1-6.el7.5.x86_64.rpm

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

x86_64:
libxml2-debuginfo-2.9.1-6.el7.5.i686.rpm
libxml2-debuginfo-2.9.1-6.el7.5.x86_64.rpm
libxml2-devel-2.9.1-6.el7.5.i686.rpm
libxml2-devel-2.9.1-6.el7.5.x86_64.rpm
libxml2-static-2.9.1-6.el7.5.i686.rpm
libxml2-static-2.9.1-6.el7.5.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
libxml2-2.9.1-6.el7.5.src.rpm

x86_64:
libxml2-2.9.1-6.el7.5.i686.rpm
libxml2-2.9.1-6.el7.5.x86_64.rpm
libxml2-debuginfo-2.9.1-6.el7.5.i686.rpm
libxml2-debuginfo-2.9.1-6.el7.5.x86_64.rpm
libxml2-python-2.9.1-6.el7.5.x86_64.rpm

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

x86_64:
libxml2-debuginfo-2.9.1-6.el7.5.i686.rpm
libxml2-debuginfo-2.9.1-6.el7.5.x86_64.rpm
libxml2-devel-2.9.1-6.el7.5.i686.rpm
libxml2-devel-2.9.1-6.el7.5.x86_64.rpm
libxml2-static-2.9.1-6.el7.5.i686.rpm
libxml2-static-2.9.1-6.el7.5.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
libxml2-2.9.1-6.el7.5.src.rpm

ppc64:
libxml2-2.9.1-6.el7.5.ppc.rpm
libxml2-2.9.1-6.el7.5.ppc64.rpm
libxml2-debuginfo-2.9.1-6.el7.5.ppc.rpm
libxml2-debuginfo-2.9.1-6.el7.5.ppc64.rpm
libxml2-devel-2.9.1-6.el7.5.ppc.rpm
libxml2-devel-2.9.1-6.el7.5.ppc64.rpm
libxml2-python-2.9.1-6.el7.5.ppc64.rpm

ppc64le:
libxml2-2.9.1-6.el7.5.ppc64le.rpm
libxml2-debuginfo-2.9.1-6.el7.5.ppc64le.rpm
libxml2-devel-2.9.1-6.el7.5.ppc64le.rpm
libxml2-python-2.9.1-6.el7.5.ppc64le.rpm

s390x:
libxml2-2.9.1-6.el7.5.s390.rpm
libxml2-2.9.1-6.el7.5.s390x.rpm
libxml2-debuginfo-2.9.1-6.el7.5.s390.rpm
libxml2-debuginfo-2.9.1-6.el7.5.s390x.rpm
libxml2-devel-2.9.1-6.el7.5.s390.rpm
libxml2-devel-2.9.1-6.el7.5.s390x.rpm
libxml2-python-2.9.1-6.el7.5.s390x.rpm

x86_64:
libxml2-2.9.1-6.el7.5.i686.rpm
libxml2-2.9.1-6.el7.5.x86_64.rpm
libxml2-debuginfo-2.9.1-6.el7.5.i686.rpm
libxml2-debuginfo-2.9.1-6.el7.5.x86_64.rpm
libxml2-devel-2.9.1-6.el7.5.i686.rpm
libxml2-devel-2.9.1-6.el7.5.x86_64.rpm
libxml2-python-2.9.1-6.el7.5.x86_64.rpm

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

ppc64:
libxml2-debuginfo-2.9.1-6.el7.5.ppc.rpm
libxml2-debuginfo-2.9.1-6.el7.5.ppc64.rpm
libxml2-static-2.9.1-6.el7.5.ppc.rpm
libxml2-static-2.9.1-6.el7.5.ppc64.rpm

ppc64le:
libxml2-debuginfo-2.9.1-6.el7.5.ppc64le.rpm
libxml2-static-2.9.1-6.el7.5.ppc64le.rpm

s390x:
libxml2-debuginfo-2.9.1-6.el7.5.s390.rpm
libxml2-debuginfo-2.9.1-6.el7.5.s390x.rpm
libxml2-static-2.9.1-6.el7.5.s390.rpm
libxml2-static-2.9.1-6.el7.5.s390x.rpm

x86_64:
libxml2-debuginfo-2.9.1-6.el7.5.i686.rpm
libxml2-debuginfo-2.9.1-6.el7.5.x86_64.rpm
libxml2-static-2.9.1-6.el7.5.i686.rpm
libxml2-static-2.9.1-6.el7.5.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
libxml2-2.9.1-6.el7.5.src.rpm

x86_64:
libxml2-2.9.1-6.el7.5.i686.rpm
libxml2-2.9.1-6.el7.5.x86_64.rpm
libxml2-debuginfo-2.9.1-6.el7.5.i686.rpm
libxml2-debuginfo-2.9.1-6.el7.5.x86_64.rpm
libxml2-devel-2.9.1-6.el7.5.i686.rpm
libxml2-devel-2.9.1-6.el7.5.x86_64.rpm
libxml2-python-2.9.1-6.el7.5.x86_64.rpm

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

x86_64:
libxml2-debuginfo-2.9.1-6.el7.5.i686.rpm
libxml2-debuginfo-2.9.1-6.el7.5.x86_64.rpm
libxml2-static-2.9.1-6.el7.5.i686.rpm
libxml2-static-2.9.1-6.el7.5.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-2019-19956
https://access.redhat.com/security/cve/CVE-2019-20388
https://access.redhat.com/security/cve/CVE-2020-7595
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.9_release_notes/index

8. Contact:

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

Copyright 2020 Red Hat, Inc.
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