Bug 197067 – dev-lang/mono < 1.2.5-r1 Buffer overflow in BigInteger (CVE-2007-5197)

• Product: Gentoo Security
• Status: RESOLVED FIXED

[Description Sune Kloppenborg Jeppesen (RETIRED) 2007-10-25 19:03:36 UTC]

Mono 1.2.5 (and earlier release) implementation of BigInteger is vulnerable to
a buffer overflow in it's reduction step of the Montgomery-based Pow methods.

While this affects the most recent Mono version this vulnerability is also
present in all previous releases of Mono.

The issue was found by a security audit (on an unnamed product) using
Mono.Security.dll assembly done by IOActive. They also provided the patch to
fix this issue. They want to coordinate the disclosure with us.

[Comment 1 Sune Kloppenborg Jeppesen (RETIRED) 2007-10-25 19:05:58 UTC]

Created attachment 134361 [details, diff]
BigInteger_overflow-fix.diff

[Comment 2 Sune Kloppenborg Jeppesen (RETIRED) 2007-10-25 19:10:45 UTC]

Jurek, if you want stable testing before the coordinated release date noted above please attach an updated ebuild to this bug. Do NOT commit anything yet. Also I'm not too familiar with mono so it might be in one of the other mono packages.

[Comment 3 Jurek Bartuszek (RETIRED) 2007-10-25 22:08:37 UTC]

Does it mean they do not want upstream to be notified about this issue? Or have they already done it? Anyway, I'm all into pushing this forward. After applying the patch mono-1.2.5.1 builds fine, but I don't have any testcase to see if the problem is gone. Moreover, I'd also add latexer to CC list, cause he's the lead :).

An updated ebuild and a patch that actually applies cleanly will follow

[Comment 4 Jurek Bartuszek (RETIRED) 2007-10-25 22:09:44 UTC]

Created attachment 134384 [details]
ebuild with patch applied

[Comment 5 Jurek Bartuszek (RETIRED) 2007-10-25 22:10:12 UTC]

Created attachment 134385 [details, diff]
updated patch

[Comment 6 Sune Kloppenborg Jeppesen (RETIRED) 2007-10-26 07:21:42 UTC]

Thx Jurek. Upstream have already been informed, I should have mentioned that in the first place.

Arch security liaisons please test and report back on this bug. Do NOT commit anything yadayada:)

[Comment 7 Pierre-Yves Rofes (RETIRED) 2007-11-02 22:47:04 UTC]

public now. Jurek, I think you can commit the corrected ebuild.
Arches liaisons, did you get a chance to test it?

[Comment 8 Jurek Bartuszek (RETIRED) 2007-11-03 00:39:05 UTC]

Done. We should also stabilize this ASAP.

[Comment 9 Robert Buchholz (RETIRED) 2007-11-03 11:45:55 UTC]

Seems none of the liaisons tested it till now.

Arches, please test and mark stable dev-lang/mono-1.2.5.1-r1.
Target keywords : "amd64 ppc x86"

[Comment 10 Robert Buchholz (RETIRED) 2007-11-03 23:55:06 UTC]

glsa filed.

[Comment 11 Dawid Węgliński (RETIRED) 2007-11-04 09:34:41 UTC]

Stable on x86

[Comment 12 Tobias Scherbaum (RETIRED) 2007-11-06 17:28:07 UTC]

ppc stable

[Comment 13 Chris Gianelloni (RETIRED) 2007-11-06 22:49:35 UTC]

amd64 done

[Comment 14 Robert Buchholz (RETIRED) 2007-11-07 01:23:06 UTC]

GLSA filed.

[Comment 15 Pierre-Yves Rofes (RETIRED) 2007-11-07 23:13:25 UTC]

GLSA 200711-10