Bug 1849881 (CVE-2019-20840)

Summary:	CVE-2019-20840 libvncserver: unaligned accesses in hybiReadAndDecode can lead to a crash
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jadahl, negativo17, rdieter
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:	2020-06-30 17:20:35 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:	1849882, 1849883
Bug Blocks:	1849880

Description Marian Rehak 2020-06-23 06:28:09 UTC

An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.

Upstream Reference:

https://github.com/LibVNC/libvncserver/commit/0cf1400c61850065de590d403f6d49e32882fd76

Comment 1 Marian Rehak 2020-06-23 06:28:34 UTC

Created libvncserver tracking bugs for this issue:

Affects: epel-7 [bug 1849883]
Affects: fedora-all [bug 1849882]

Comment 2 Product Security DevOps Team 2020-06-30 17:20:35 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-2019-20840