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Date: Tue, 9 Dec 2014 17:07:55 +0100
From: Vincent Lefevre <vincent@...c17.net>
To: Vasyl Kaigorodov <vkaigoro@...hat.com>, 772008@...s.debian.org
Cc: oss-security@...ts.openwall.com
Subject: Re: Bug#772008: CVE request:  mpfr: buffer overflow in mpfr_strtofr

Hi,

On 2014-12-08 13:45:12 +0100, Vasyl Kaigorodov wrote:
> Hello,
> 
> A buffer overflow was reported [1] in mpfr.
> This is due to incorrect GMP documentation for mpn_set_str about the
> size of a buffer (discussion is at [1]; first fix in the GMP
> documentation is at [2]). This bug is present in the MPFR versions
> from 2.1.0 (adding mpfr_strtofr) to this one, and can be detected by
> running "make check" in a 32-bit ABI under GNU/Linux with alloca
> disabled (this is currently possible by using the --with-gmp-build
> configure option where alloca has been disabled in the GMP build). It
> is fixed by the strtofr patch [3].
> Corresponding changeset in the 3.1 branch: 9110 [4].
> 
> [1]: https://gmplib.org/list-archives/gmp-bugs/2013-December/003267.html
> [2]: https://gmplib.org/repo/gmp-5.1/raw-rev/d19172622a74
> [3]: http://www.mpfr.org/mpfr-3.1.2/patch11
> [4]: https://gforge.inria.fr/scm/viewvc.php?view=rev&root=mpfr&revision=9110

The corresponding changeset is 9243, with URL:

  https://gforge.inria.fr/scm/viewvc.php?view=rev&root=mpfr&revision=9243

Regards,

-- 
Vincent Lefèvre <vincent@...c17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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