GNU bug report logs - #48612
Expat "billion laughs attack" vulnerability (CVE-2013-0340)

Previous Next

Full log

View this message in rfc822 format

From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Marius Bakke <marius <at> gnu.org>
Subject: bug#48612: closed (Re: bug#48612: Expat "billion laughs attack"
 vulnerability (CVE-2013-0340))
Date: Thu, 03 Jun 2021 03:17:02 +0000

[Message part 1 (text/plain, inline)]

Your bug report

#48612: Expat "billion laughs attack" vulnerability (CVE-2013-0340)

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 48612 <at> debbugs.gnu.org.

-- 
48612: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=48612
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Leo Famulari <leo <at> famulari.name>
To: Marius Bakke <marius <at> gnu.org>
Cc: 48612-done <at> debbugs.gnu.org
Subject: Re: bug#48612: Expat "billion laughs attack" vulnerability
 (CVE-2013-0340)
Date: Wed, 2 Jun 2021 23:16:29 -0400

[Message part 3 (text/plain, inline)]

On Mon, May 24, 2021 at 01:06:47PM -0400, Leo Famulari wrote:
> I think it's okay to graft it. The distro is big enough that there will
> always be some grafted packages. However, I'd like to try ungrafting at
> regular periods; based on the current ungrafting build cycle, monthly
> may be reasonable.

I updated your patch to use expat 2.4.1 and pushed as
6d71f6a73cd27d61d3302b9658893428af6314d2

[signature.asc (application/pgp-signature, inline)]

[Message part 5 (message/rfc822, inline)]

From: Marius Bakke <marius <at> gnu.org>
To: bug-guix <at> gnu.org
Subject: Expat "billion laughs attack" vulnerability (CVE-2013-0340)
Date: Sun, 23 May 2021 17:15:11 +0200

[Message part 6 (text/plain, inline)]

Greetings Guix,

What's old is new again!  Expat 2.4.0 was recently released with a
fix for a denial of service issue dubbed "billion laughs attack":

  https://github.com/libexpat/libexpat/blob/R_2_4_0/expat/Changes
  https://en.wikipedia.org/wiki/Billion_laughs_attack

Seeing as this vulnerability appears to be eight years old and is
"merely" a DoS: is it worth fixing on the 'master' branch (and
re-grafting pretty much everything)?

In any case I've attached a patch that does just that and I'm currently
using it on my system.  I'm hesitant to push it because of the grafting
cost and would like others opinion.

[0001-gnu-expat-Replace-with-2.4.0-fixes-CVE-2013-0340.patch (text/x-patch, attachment)]

[signature.asc (application/pgp-signature, inline)]

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.