Bug 1927237 (CVE-2020-29385)

Summary: CVE-2020-29385 gdk-pixbuf: DoS in lzw.c
Product: [Other] Security Response Reporter: Dhananjay Arunesh <darunesh>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: erik-fedora, fedora, gnome-sig, kaycoth, klember, manisandro, mclasen, otte, rh-spice-bugs, rjones
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: gdk-pixbuf 2.42.2 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2022-04-18 02:27:51 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1927239, 1928670, 1928673    
Bug Blocks: 1927240    

Description Dhananjay Arunesh 2021-02-10 11:40:49 UTC 
GNOME gdk-pixbuf (aka GdkPixbuf) before 2.42.2 allows a denial of service (infinite loop) in lzw.c in the function write_indexes. if c->self_code equals 10, self->code_table[10].extends will assign the value 11 to c. The next execution in the loop will assign self->code_table[11].extends to c, which will give the value of 10. This will make the loop run infinitely. This bug can, for example, be triggered by calling this function with a GIF image with LZW compression that is crafted in a special way.

References:
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/blob/master/NEWS
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/issues/164
Comment 1 Dhananjay Arunesh 2021-02-10 11:41:37 UTC 
Created gdk-pixbuf2 tracking bugs for this issue:

Affects: fedora-all [bug 1927239]
Comment 2 Stefan Cornelius 2021-02-15 10:27:15 UTC 
Patch:
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/commit/bdd3acbd48a575d418ba6bf1b32d7bda2fae1c81

The issue was introduced in version 2.40.0:
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/commit/b88f1ce91a610a4e491a4ad6352183791e78afac
Comment 5 Stefan Cornelius 2021-02-15 10:40:02 UTC 
Created mingw-gdk-pixbuf tracking bugs for this issue:

Affects: fedora-all [bug 1928673]
Comment 6 Product Security DevOps Team 2022-04-18 02:27:49 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-29385