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

                               ESB-2020.4473
                         xerces-c security update
                             18 December 2020

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

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

Product:           xerces-c
Publisher:         Debian
Operating System:  Debian GNU/Linux
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-1311  

Reference:         ESB-2020.0818
                   ESB-2020.0813

Original Bulletin: 
   https://lists.debian.org/debian-security-announce/2020/msg00221.html
   https://lists.debian.org/debian-lts-announce/2020/12/msg00025.html

Comment: This bulletin contains two (2) Debian security advisories.

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Debian Security Advisory DSA-4814-1                   security@debian.org
https://www.debian.org/security/                       Sebastien Delafond
December 17, 2020                     https://www.debian.org/security/faq
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Package        : xerces-c
CVE ID         : CVE-2018-1311
Debian Bug     : 947431

It was discovered that xerces-c, a validating XML parser library for
C++, did not correctly scan DTDs. The use-after-free vulnerability
resulting from this issue would allow a remote attacker to leverage a
specially crafted XML file in order to crash the application or
potentially execute arbitrary code.
Please note that the patch fixing this issue comes at the expense of a
newly introduced memory leak.

For the stable distribution (buster), this problem has been fixed in
version 3.2.2+debian-1+deb10u1.

We recommend that you upgrade your xerces-c packages.

For the detailed security status of xerces-c please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/xerces-c

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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Debian LTS Advisory DLA-2498-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                                     
December 17, 2020                             https://wiki.debian.org/LTS
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Package        : xerces-c
Version        : 3.1.4+debian-2+deb9u2
CVE ID         : CVE-2018-1311
Debian Bug     : 947431

The UK's National Cyber Security Centre (NCSC) discovered that
Xerces-C, a validating XML parser library for C++, contains a
use-after-free error triggered during the scanning of external
DTDs. An attacker could cause a Denial of Service (DoS) and possibly
achieve remote code execution. This flaw has not been addressed in the
maintained version of the library and has no complete mitigation. The
first is provided by this update which fixes the use-after-free
vulnerability at the expense of a memory leak. The other is to disable
DTD processing, which can be accomplished via the DOM using a standard
parser feature, or via SAX using the XERCES_DISABLE_DTD environment
variable.

For Debian 9 stretch, this problem has been fixed in version
3.1.4+debian-2+deb9u2.

We recommend that you upgrade your xerces-c packages.

For the detailed security status of xerces-c please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/xerces-c

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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