Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Tue, 19 Dec 2017 17:11:19 +0100
From: Hanno Böck <hanno@...eck.de>
To: oss-security@...ts.openwall.com
Subject: GIMP parser bugs (FLIMP and more)

Hi,

See also
https://flimp.fuzzing-project.org/

Background: In 2014, back when I started the fuzzing project, I
reported two bugs in GIMP in their more obscure parsers. Recently I was
contacted by Tobias Stöckmann who wrote a working exploit (on freebsd <-
no aslr, thus easier) for one of those bugs in the FLIC parser. He also
submitted a patch.

The bugs were ignored all the time, patches as well.

I reported a couple of more bugs and also contacted the GNOME security
team. Some have patches, others not, ony one got handled. It seems
overall the file format importers are unmaintained.
I also tried to submit a fuzzing guide to the gimp wiki, which failed,
because the people who are supposed to hand out user accounts don't
answer. (gimp is not fuzzing friendly.)

The bugs:

Heap overflow in FLI import (the one where we have an exploit):
https://bugzilla.gnome.org/show_bug.cgi?id=739133

OOB read in TGA (with patch)
https://bugzilla.gnome.org/show_bug.cgi?id=739134

OOB read in XCF (patch, the only one that got merged and fixed)
https://bugzilla.gnome.org/show_bug.cgi?id=790783

OOB read in GBR (no patch, looks like string/utf8 issue)
https://bugzilla.gnome.org/show_bug.cgi?id=790784

Heap overflow in PSP (no patch, doesn't look straightforward to fix)
https://bugzilla.gnome.org/show_bug.cgi?id=790849

OOB read in PSP (no patch)
https://bugzilla.gnome.org/show_bug.cgi?id=790853


-- 
Hanno Böck
https://hboeck.de/

mail/jabber: hanno@...eck.de
GPG: FE73757FA60E4E21B937579FA5880072BBB51E42

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.