Bug 1829010 (CVE-2020-11759)

Summary:	CVE-2020-11759 OpenEXR: out-of-bounds write due to integer overflows in CompositeDeepScanLine::Data::handleDeepFrameBuffer and readSampleCountForLineBlock
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jeischma, jridky, kwizart, manisandro, rdieter, rh-spice-bugs
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	OpenEXR 2.4.1	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-01 17:12:01 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:	1829018, 1829019, 1834526, 1834527
Bug Blocks:	1829017

Description Guilherme de Almeida Suckevicz 2020-04-28 17:30:57 UTC

An issue was discovered in OpenEXR before 2.4.1. Because of integer overflows in CompositeDeepScanLine::Data::handleDeepFrameBuffer and readSampleCountForLineBlock, an attacker can write to an out-of-bounds pointer.

References:
https://bugs.chromium.org/p/project-zero/issues/detail?id=1987
https://github.com/AcademySoftwareFoundation/openexr/blob/master/CHANGES.md#version-241-february-11-2020

Comment 1 Guilherme de Almeida Suckevicz 2020-04-28 17:36:38 UTC

Created OpenEXR tracking bugs for this issue:

Affects: fedora-all [bug 1829019]


Created mingw-OpenEXR tracking bugs for this issue:

Affects: fedora-all [bug 1829018]

Comment 2 Todd Cullum 2020-05-08 21:35:26 UTC

Upstream patch: https://github.com/AcademySoftwareFoundation/openexr/commit/b9997d0c045fa01af3d2e46e1a74b07cc4519446#diff-c94c7f60fd67c758b01f35b05c753bab

Comment 3 Todd Cullum 2020-05-11 20:38:34 UTC

Other associated patches: https://github.com/AcademySoftwareFoundation/openexr/commit/e79d2296496a50826a15c667bf92bdc5a05518b4#diff-43177fd19d088bdab917430799223092

Comment 6 Todd Cullum 2020-05-11 20:52:22 UTC

Appears to be caused by an integer overflow due to use of an int type rather than ptrdiff_t type in CompositeDeepScanLine::Data::handleDeepFrameBuffer.

Comment 7 Todd Cullum 2020-05-11 20:57:01 UTC

Statement:

The versions of OpenEXR which are vulnerable to this flaw are not shipped in Red Hat Enterprise Linux 7 or prior.

Comment 8 Todd Cullum 2020-05-21 22:26:55 UTC

After speaking with upstream, the patch for this was actually: https://github.com/AcademySoftwareFoundation/openexr/pull/643/commits/41a99da450e749800182674012c8df002919e15a .