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

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From: Marius Bakke <marius <at> gnu.org>
To: 48612 <at> debbugs.gnu.org
Subject: bug#48612: Expat "billion laughs attack" vulnerability (CVE-2013-0340)
Date: Sun, 23 May 2021 17:15:11 +0200

[Message part 1 (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)]

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