Bug 1520227 (CVE-2017-16938)

Summary:	CVE-2017-16938 optipng: global buffer overflow in gifread.c:LZWReadByte when parsing malicious GIF
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	dkholia, jgrulich, opensource
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An invalid memory write flaw was found in the way OptiPNG handles processing of GIF files. This flaw could potentially be used to crash the OptiPNG program by tricking it into processing crafted GIF files.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-01-05 08:14:45 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:	1520230
Bug Blocks:	1520229

Description Sam Fowler 2017-12-04 05:04:11 UTC

A global buffer overflow in OptiPNG 0.7.6 allows remote attackers to cause a denial-of-service attack with a maliciously crafted GIF format file, related to an uncontrolled loop in the LZWReadByte function of the gifread.c file.

References:

https://nvd.nist.gov/vuln/detail/CVE-2017-16938
https://bugs.debian.org/878839
https://bugs.gentoo.org/639690
https://bugs.mageia.org/show_bug.cgi?id=22099
https://bugzilla.suse.com/show_bug.cgi?id=1069774
https://sourceforge.net/p/optipng/bugs/69/
https://sourceforge.net/p/optipng/bugs/_discuss/thread/10e27bff/63db/attachment/optipng-076-sfbug-69.patch

Comment 1 Sam Fowler 2017-12-04 05:22:11 UTC

Created optipng tracking bugs for this issue:

Affects: fedora-all [bug 1520230]

Comment 3 Dhiru Kholia 2018-01-05 08:17:30 UTC

Statement:

Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.