Bug 1804723 (CVE-2010-5304)

Summary:	CVE-2010-5304 realvnc: Null pointer dereference flaw in ClientCutText message handling
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	twaugh
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in realvnc. LibVNCServer, in versions prior to 0.9.9, contain a NULL pointer dereference when handling certain ClientCutText messages which could be used by a remote attacker to crash the VNC server. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-02-25 09:49:44 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:
Bug Blocks:	1803219

Description Guilherme de Almeida Suckevicz 2020-02-19 14:09:28 UTC

A NULL pointer dereference flaw was found in the way LibVNCServer before 0.9.9 handled certain ClientCutText message. A remote attacker could use this flaw to crash the VNC server by sending a specially crafted ClientCutText message from a VNC client.

Reference:
http://www.openwall.com/lists/oss-security/2014/09/23/6

This libVNCServer flaw was assigned CVE-2014-6053. A similar flaw was found in RealVNC server which has been assigned CVE-2010-5304.

Comment 1 Huzaifa S. Sidhpurwala 2020-02-25 04:14:34 UTC

https://packetstormsecurity.com/files/89160/RealVNC-VNC-Server-Free-Edition-4.1.3-Denial-Of-Service.html contains instructions for reproducing this flaw.

Comment 2 Huzaifa S. Sidhpurwala 2020-02-25 04:14:38 UTC

External References:

https://packetstormsecurity.com/files/89160/RealVNC-VNC-Server-Free-Edition-4.1.3-Denial-Of-Service.html

Comment 3 Huzaifa S. Sidhpurwala 2020-02-25 04:43:36 UTC

Statement:

This flaw is in RealVNC shipped with Red Hat Enterprise Linux 5. A similar flaw was also found in LibVNCServer and was assigned CVE-2014-6053

Comment 4 Product Security DevOps Team 2020-02-25 09:49:44 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-2010-5304