Debian Bug report logs -
#988603
libxml2: CVE-2021-3541: Exponential entity expansion attack bypasses all existing protection mechanisms
Reply or subscribe to this bug.
Toggle useless messages
Report forwarded
to debian-bugs-dist@lists.debian.org, carnil@debian.org, team@security.debian.org, Debian XML/SGML Group <debian-xml-sgml-pkgs@lists.alioth.debian.org>:
Bug#988603; Package src:libxml2.
(Sun, 16 May 2021 19:15:04 GMT) (full text, mbox, link).
Acknowledgement sent
to Salvatore Bonaccorso <carnil@debian.org>:
New Bug report received and forwarded. Copy sent to carnil@debian.org, team@security.debian.org, Debian XML/SGML Group <debian-xml-sgml-pkgs@lists.alioth.debian.org>.
(Sun, 16 May 2021 19:15:04 GMT) (full text, mbox, link).
Message #5 received at submit@bugs.debian.org (full text, mbox, reply):
Source: libxml2
Version: 2.9.10+dfsg-6.6
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/libxml2/-/issues/228
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>
Hi,
The following vulnerability was published for libxml2.
CVE-2021-3541[0]:
| Exponential entity expansion attack bypasses all existing protection
| mechanisms
Technical details for the vulnerability are unfortunately not public,
but it looks that the flaw is essentially a variant of the billion
laughts attack (CVE-2003-1564) which can lead to denial of service for
applications using libxml2.
If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.
For further information see:
[0] https://security-tracker.debian.org/tracker/CVE-2021-3541
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3541
[1] https://gitlab.gnome.org/GNOME/libxml2/-/issues/228
[2] https://gitlab.gnome.org/GNOME/libxml2/-/commit/8598060bacada41a0eb09d95c97744ff4e428f8e
Please adjust the affected versions in the BTS as needed.
Regards,
Salvatore
Marked as found in versions libxml2/2.9.4+dfsg1-7+deb10u1.
Request was from Salvatore Bonaccorso <carnil@debian.org>
to control@bugs.debian.org.
(Sun, 16 May 2021 19:36:03 GMT) (full text, mbox, link).
Marked as found in versions libxml2/2.9.4+dfsg1-7.
Request was from Salvatore Bonaccorso <carnil@debian.org>
to control@bugs.debian.org.
(Sun, 16 May 2021 19:36:03 GMT) (full text, mbox, link).
Information forwarded
to debian-bugs-dist@lists.debian.org, Debian XML/SGML Group <debian-xml-sgml-pkgs@lists.alioth.debian.org>:
Bug#988603; Package src:libxml2.
(Mon, 17 May 2021 03:39:02 GMT) (full text, mbox, link).
Acknowledgement sent
to Sebastian Pipping <sebastian@pipping.org>:
Extra info received and forwarded to list. Copy sent to Debian XML/SGML Group <debian-xml-sgml-pkgs@lists.alioth.debian.org>.
(Mon, 17 May 2021 03:39:02 GMT) (full text, mbox, link).
Message #14 received at 988603@bugs.debian.org (full text, mbox, reply):
Hi!
> Technical details for the vulnerability are unfortunately not public,
I have blogged about the technical details of CVE-2021-3541 at:
https://blog.hartwork.org/posts/cve-2021-3541-parameter-laughs-fixed-in-libxml2-2-9-11/
.
Best, Sebastian
Send a report that this bug log contains spam.
Debian bug tracking system administrator <owner@bugs.debian.org>.
Last modified:
Mon May 17 12:44:00 2021;
Machine Name:
bembo
Debian Bug tracking system
Debbugs is free software and licensed under the terms of the GNU
Public License version 2. The current version can be obtained
from https://bugs.debian.org/debbugs-source/.
Copyright © 1999 Darren O. Benham,
1997,2003 nCipher Corporation Ltd,
1994-97 Ian Jackson,
2005-2017 Don Armstrong, and many other contributors.
Vulmon