Bug 1429965 (CVE-2016-10244)

Summary:	CVE-2016-10244 freetype: parse_charstrings function in type1/t1load.c does not ensure that a font contains a glyph name
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:	behdad, bmcclain, cfergeau, dblechte, eedri, erik-fedora, fedora-mingw, fonts-bugs, gklein, kevin, lsurette, mgoldboi, michal.skrivanek, mkasik, rbalakri, rh-spice-bugs, rjones, sardella, sherold, slawomir, srevivo, ykaul, ylavi
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:	2017-03-23 05:50:59 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1429967, 1429968, 1429969
Bug Blocks:	1429966

Description Andrej Nemec 2017-03-07 15:17:53 UTC

The parse_charstrings function in type1/t1load.c in FreeType 2 does not ensure that a font contains a glyph name, which allows remote attackers to cause a denial of service (heap-based buffer over-read) or possibly have unspecified other impact via a crafted file.

References:

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=36

Upstream patch:

http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/src/type1/t1load.c?h=VER-2-7&id=a660e3de422731b94d4a134d27555430cbb6fb39

Comment 1 Andrej Nemec 2017-03-07 15:20:35 UTC

Created freetype tracking bugs for this issue:

Affects: fedora-all [bug 1429968]


Created mingw-freetype tracking bugs for this issue:

Affects: epel-7 [bug 1429969]
Affects: fedora-all [bug 1429967]

Comment 2 Huzaifa S. Sidhpurwala 2017-03-23 05:50:59 UTC

Analysis: 

As per the patch, seems to be a OOB read, causing a crash. I dont have access to the reproducer, but seems all versions of freetype shipped with Red Hat Enterprise Linux are affected.