Bug 1488817 (CVE-2017-2862)

Summary:	CVE-2017-2862 gdk-pixbuf2: Heap overflow in the gdk_pixbuf__jpeg_image_load_increment function
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	gnome-sig, mclasen, otte, raveit65.sun
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	gdk-pixbuf 2.36.7	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-09-21 02:55:09 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:	1569815, 1888085
Bug Blocks:	1486739

Description Andrej Nemec 2017-09-06 09:20:39 UTC

A heap overflow vulnerability exists in the gdk_pixbuf__jpeg_image_load_increment functionality of Gdk-Pixbuf2.

External References:

https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0366

Comment 1 Huzaifa S. Sidhpurwala 2017-09-21 02:47:46 UTC

Upstream commit:

https://git.gnome.org/browse/gdk-pixbuf/commit/gdk-pixbuf/io-jpeg.c?id=c2a40a92fe3df4111ed9da51fe3368c079b86926

Comment 2 Huzaifa S. Sidhpurwala 2017-09-21 02:54:31 UTC

Analysis:

gdk-pixbuf assumed that the value of output_components to be either 3 or 4, but not an invalid value (9) or an unsupported value (1). Setting output color components to a value other than 3 or 4 causes invalid writes when libjpeg-turbo decodes images. 

Code execution seems to be unlikely because of the number of bytes which can be written on the heap.