Bug 1884107 (CVE-2020-26682)

Summary:	CVE-2020-26682 libass: in`ass_outline_construct`'s call to `outline_stroke` a signed integer overflow could result in undefined behaviour
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	martin.sourada
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:	2020-10-01 08:21:10 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:	1884109, 1884108
Bug Blocks:

Description Michael Kaplan 2020-10-01 04:57:38 UTC

In `ass_outline_construct`'s call to `outline_stroke` a signed integer
overflow happens leading to undefined behaviour.

Comment 1 Michael Kaplan 2020-10-01 04:57:41 UTC

External References:

https://github.com/libass/libass/issues/431
https://github.com/libass/libass/pull/432

Comment 2 Michael Kaplan 2020-10-01 04:57:57 UTC

Created libass tracking bugs for this issue:

Affects: epel-all [bug 1884109]
Affects: fedora-all [bug 1884108]

Comment 3 Product Security DevOps Team 2020-10-01 08:21:10 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.