Bug 1860344 (CVE-2020-14397)

Summary:	CVE-2020-14397 libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jadahl, negativo17, oholy, rdieter
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libvncserver 0.9.13	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-05-18 14:35:07 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:	1860345, 1860346, 1861150, 1861151, 1861152, 1861153
Bug Blocks:	1860332

Description Marian Rehak 2020-07-24 10:45:15 UTC

An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rfbregion.c has a NULL pointer dereference.

Upstream commit:

https://github.com/LibVNC/libvncserver/commit/38e98ee61d74f5f5ab4aa4c77146faad1962d6d0

Comment 1 Marian Rehak 2020-07-24 10:51:55 UTC

Created libvncserver tracking bugs for this issue:

Affects: epel-7 [bug 1860346]
Affects: fedora-all [bug 1860345]

Comment 2 Todd Cullum 2020-07-27 22:52:51 UTC

libvncserver/rfbregion.c's sraSpanInsertAfter(), sraSpanInsertBefore(), sraSpanRemove() and libvncserver/rfbserver.c's rfbClientIteratorNext(), and rfbReleaseClientIterator() are missing NULL checks for sraSpan * and rfbClientIteratorPtr parameters. If one of them is NULL, this could cause a crash.

Comment 5 Product Security DevOps Team 2021-05-18 14:35:07 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-2020-14397

Comment 6 errata-xmlrpc 2021-05-18 15:16:20 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1811 https://access.redhat.com/errata/RHSA-2021:1811