CVE-2013-6954

Publication date 12 January 2014

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

The png_do_expand_palette function in libpng before 1.6.8 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via (1) a PLTE chunk of zero bytes or (2) a NULL palette, related to pngrtran.c and pngset.c.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libpng	13.10 saucy	Not affected
	13.04 raring	Not affected
	12.10 quantal	Not affected
	12.04 LTS precise	Not affected
	10.04 LTS lucid	Not affected
openjdk-7	14.04 LTS trusty	Not in release
	13.10 saucy	Ignored end of life
	12.10 quantal	Ignored end of life
	12.04 LTS precise	Ignored end of life
	10.04 LTS lucid	Not in release

Notes

mdeslaur

vulnerable code introduced in 1.6.1. In 1.2.x, png_ptr->palette is always set in png_set_PLTE() in pngset.c.

jdstrand

openjdk uses system png

Patch details

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

Package	Patch details
libpng	Upstream: http://sourceforge.net/p/libpng/code/ci/1faa6ff32c648acfe3cf30a58d31d7aebc24968c

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H