Bug 1410168 (CVE-2016-9942)

Summary:	CVE-2016-9942 libvncserver: Heap-based buffer overflow in ultra.c
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dkholia, negativo17, ppisar, rdieter, slawomir
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libvncserver 0.9.11	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-01-24 07:08:12 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:	1410178, 1410179, 1410180
Bug Blocks:	1410176

Description Adam Mariš 2017-01-04 16:17:31 UTC

Heap-based buffer overflow was found in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 that allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions.

Upstream patch:

https://github.com/LibVNC/libvncserver/commit/5fff4353f66427b467eb29e5fdc1da4f2be028bb

Upstream bug:

https://github.com/LibVNC/libvncserver/pull/137

Comment 1 Adam Mariš 2017-01-04 16:41:26 UTC

Created libvncserver tracking bugs for this issue:

Affects: fedora-all [bug 1410178]
Affects: epel-5 [bug 1410179]
Affects: epel-7 [bug 1410180]

Comment 3 Fedora Update System 2017-05-26 03:54:41 UTC

libvncserver-0.9.11-2.fc24.1 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.