Bug 1661117 (CVE-2018-20020)

Summary:	CVE-2018-20020 libvncserver: Heap out-of-bound write inside structure in VNC client code allows for potential code execution
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	negativo17, ppisar, rdieter, sfowler
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:	2021-10-25 22:22:31 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:	1661118, 1661119, 1663000, 1663005
Bug Blocks:	1661105

Description Sam Fowler 2018-12-20 07:06:11 UTC

LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution.


External Reference:

https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-030-libvnc-heap-out-of-bound-write/


Upstream Patch:

https://github.com/LibVNC/libvncserver/commit/7b1ef0ffc4815cab9a96c7278394152bdc89dc4d

Comment 1 Sam Fowler 2018-12-20 07:06:25 UTC

Created libvncserver tracking bugs for this issue:

Affects: epel-7 [bug 1661119]
Affects: fedora-all [bug 1661118]

Comment 2 Sam Fowler 2018-12-20 07:38:33 UTC

Upstream Issue:

https://github.com/LibVNC/libvncserver/issues/250