Bug 1790313 (CVE-2019-15693)

Summary:	CVE-2019-15693 tigervnc: Heap buffer overflow in TightDecoder::FilterGradient
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 22:31:55 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:	1790314, 1791762, 1791763, 1819882, 1819883
Bug Blocks:	1790319

Description Pedro Sampaio 2020-01-13 06:11:27 UTC

TigerVNC version prior to 1.10.1 is vulnerable to heap buffer overflow, which occurs in TightDecoder::FilterGradient. 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/b4ada8d0c6dac98c8b91fc64d112569a8ae5fb95

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 06:11:46 UTC

Created tigervnc tracking bugs for this issue:

Affects: fedora-all [bug 1790314]

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 22:31:55 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-2019-15693

Comment 5 errata-xmlrpc 2020-09-29 19:27:52 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