ESB-2021.1849 – [Linux][Debian] libxml2: Denial of service – Existing account

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AUSCERT External Security Bulletin Redistribution

ESB-2021.1849
libxml2 security update
31 May 2021

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AusCERT Security Bulletin Summary
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Product: libxml2
Publisher: Debian
Operating System: Debian GNU/Linux
Linux variants
Impact/Access: Denial of Service — Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3541

Original Bulletin:
https://lists.debian.org/debian-lts-announce/2021/05/msg00024.html

Comment: This advisory references vulnerabilities in products which run on
platforms other than Debian. It is recommended that administrators
running libxml2 check for an updated version of the software for
their operating system.

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Debian LTS Advisory DLA-2669-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Thorsten Alteholz
May 30, 2021 https://wiki.debian.org/LTS
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Package : libxml2
Version : 2.9.4+dfsg1-2.2+deb9u5
CVE ID : CVE-2021-3541

An issue has been found in libxml2, the GNOME XML library.
This issue is called “Parameter Laughs”-attack and is related to parameter
entities expansion.
It is similar to the “Billion Laughs”-attacks found earlier in libexpat.
More information can be found at [1]

[1] https://blog.hartwork.org/posts/cve-2021-3541-parameter-laughs-fixed-in-libxml2-2-9-11/

For Debian 9 stretch, this problem has been fixed in version
2.9.4+dfsg1-2.2+deb9u5.

We recommend that you upgrade your libxml2 packages.

For the detailed security status of libxml2 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/libxml2

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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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT’s members. As
AusCERT did not write the document quoted above, AusCERT has had no control
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which may arise from following or acting on information or advice contained in
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NOTE: This is only the original release of the security bulletin. It may
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Previous advisories and external security bulletins can be retrieved from:

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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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On call after hours for member emergencies only.
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