Bug 1790315 (CVE-2019-15694)

Summary:	CVE-2019-15694 tigervnc: Heap buffer overflow in DecodeManager::decodeRect
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	fedora, jgrulich, twaugh, vonsch
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	tigervnc 1.10.1	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-04-16 22:31:58 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:	1790316, 1791767, 1791768, 1819879, 1819880
Bug Blocks:	1790319

Description Pedro Sampaio 2020-01-13 06:13:58 UTC

TigerVNC version prior to 1.10.1 is vulnerable to heap buffer overflow, which could be triggered from DecodeManager::decodeRect. Vulnerability occurs due to the signdness error in processing MemOutStream. Exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity.

Upstream patch:

https://github.com/CendioOssman/tigervnc/commit/0943c006c7d900dfc0281639e992791d6c567438

References:

https://github.com/TigerVNC/tigervnc/releases/tag/v1.10.1
https://www.openwall.com/lists/oss-security/2019/12/20/2

Comment 1 Pedro Sampaio 2020-01-13 06:14:18 UTC

Created tigervnc tracking bugs for this issue:

Affects: fedora-all [bug 1790316]

Comment 3 errata-xmlrpc 2020-04-16 21:06:32 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:1497 https://access.redhat.com/errata/RHSA-2020:1497

Comment 4 Product Security DevOps Team 2020-04-16 22:31:58 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-15694

Comment 5 errata-xmlrpc 2020-09-29 19:27:50 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:3875 https://access.redhat.com/errata/RHSA-2020:3875