CVE-2020-29385

Publication date 8 December 2020

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
gdk-pixbuf	20.10 groovy	Fixed 2.40.0+dfsg-5ubuntu0.1
	20.04 LTS focal	Fixed 2.40.0+dfsg-3ubuntu0.1
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release

Notes

mdeslaur

per upstream bug, gdk-pixbuf < 2.39.2 is not vulnerable

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
gdk-pixbuf	Upstream: bdd3acb

Severity score breakdown

Parameter	Value
Base score	5.5 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-4663-1
GDK-PixBuf vulnerability
8 December 2020