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

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Your message dated Wed, 2 Jun 2021 23:16:29 -0400
with message-id <YLhJjeorZ1b9o4NK@jasmine.lan>
and subject line Re: bug#48612: Expat "billion laughs attack" vulnerability 
(CVE-2013-0340)
has caused the debbugs.gnu.org bug report #48612,
regarding Expat "billion laughs attack" vulnerability (CVE-2013-0340)
to be marked as done.

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--- Begin Message --- Subject: Expat "billion laughs attack" vulnerability (CVE-2013-0340) Date: Sun, 23 May 2021 17:15:11 +0200

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
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--- Begin Message --- Subject: Re: bug#48612: Expat "billion laughs attack" vulnerability (CVE-2013-0340) Date: Wed, 2 Jun 2021 23:16:29 -0400

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

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