Bug 1324823 (CVE-2016-3622)

Summary:	CVE-2016-3622 libtiff: Division by zero in fpAcc function
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	carnil, erik-fedora, nforro, phracek, slawomir
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-05-11 08:28:15 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:	1324816, 1324817
Bug Blocks:	1316881

Description Adam Mariš 2016-04-07 11:30:18 UTC

Division by zero vulnerability was found in fpAcc function in tif_predict.c in tiff2rgba, allowing attacker to cause a denial of service via a crafted TIFF image.

Vulnerable code:

libtiff-master/libtiff/tif_predict.c:381.

377 fpAcc(TIFF* tif, uint8* cp0, tmsize_t cc)
378 {
379         tmsize_t stride = PredictorState(tif)->stride;
380         uint32 bps = tif->tif_dir.td_bitspersample / 8;
381         tmsize_t wc = cc / bps;
382         tmsize_t count = cc;
383         uint8 *cp = (uint8 *) cp0;
384         uint8 *tmp = (uint8 *)_TIFFmalloc(cc);

Public via:

http://seclists.org/oss-sec/2016/q2/23

Comment 1 Adam Mariš 2016-04-07 11:30:28 UTC

Acknowledgments:

Name: Mei Wang (Qihoo 360)

Comment 3 Stefan Cornelius 2017-05-11 08:28:24 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/.