Re: rpm/librpm/rpm-python memory corruption pre-verification

[nicolas vigier <boklm () mars-attacks org>]

On Tue, 27 Sep 2011, Tavis Ormandy wrote:

> Hey, after the scary flaws Georgi spotted in apt-get, I had a quick look at
> rpm signature verification. Some trivial bitflipping found a few memory
> corruption issues.
>
> Originally I didn't think yum used rpm, but i was wrong, rpm-python is a
> native module wrapper that exports librpm to python. I'll step through the
> signature verification logic when I get a chance.
>
> Obviously we need the sections of rpm code touched before signature
> verification to be bulletproof, as most distributions rely on public mirror
> services that may or may not be trusted. Any volunteers who know crypto
> better than me appreciated, I'll be primarily looking for memory corruption.
>
> https://bugzilla.redhat.com/show_bug.cgi?id=741606
> https://bugzilla.redhat.com/show_bug.cgi?id=741612

Patches on rpm git :
http://rpm.org/gitweb?p=rpm.git;a=commitdiff;h=11a7e5d95a8ca8c7d4eaff179094afd8bb74fc3f
http://rpm.org/gitweb?p=rpm.git;a=commitdiff;h=a48f0e20cbe2ababc88b2fc52fb7a281d6fc1656