Bug 1649385 (CVE-2018-19210)

Summary:	CVE-2018-19210 libtiff: NULL pointer dereference in TIFFWriteDirectorySec function in tif_dirwrite.c
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	erik-fedora, mike, nforro, phracek, rh-spice-bugs
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-11-16 09:45:50 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:	1649387, 1649388, 1649389, 1649391, 1649392
Bug Blocks:	1649390

Description Laura Pardo 2018-11-13 14:41:15 UTC

In LibTIFF 4.0.9, there is a NULL pointer dereference in the TIFFWriteDirectorySec function in tif_dirwrite.c that will lead to a denial of service attack, as demonstrated by tiffset. 


References: 
http://bugzilla.maptools.org/show_bug.cgi?id=2820

Comment 1 Laura Pardo 2018-11-13 14:42:30 UTC

Created libtiff tracking bugs for this issue:

Affects: fedora-all [bug 1649387]


Created mingw-libtiff tracking bugs for this issue:

Affects: epel-7 [bug 1649388]
Affects: fedora-all [bug 1649389]

Comment 3 Huzaifa S. Sidhpurwala 2018-11-16 09:45:50 UTC

This is reproduce-able without ASAN builds as well. valgrind shows Null pointer deref with the following errors:

poc0: Failed to allocate memory for to read TIFF directory (0 elements of 12 bytes each).
TIFFReadDirectory: Failed to read directory at offset 5356.

Running without valgrind yeilds segfault.

There is no upstream patch yet.