Bug 1144291 – CVE-2014-6054 libvncserver: server divide-by-zero flaw in scaling factor handling

Bugzilla will be upgraded to version 5.0 on a still to be determined date in the near future. The original upgrade date has been delayed.

Bug 1144291 - (CVE-2014-6054) CVE-2014-6054 libvncserver: server divide-by-zero flaw in scaling factor handling

Summary:	CVE-2014-6054 libvncserver: server divide-by-zero flaw in scaling factor hand...

Status:	CLOSED ERRATA

Aliases:	CVE-2014-6054

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20140923,repor...
Keywords:	Security

Depends On:	1145878 1145879 1145880 1145883 1157668 1157669 1157670 1157671 1157674 1157675 1157676 1157677
Blocks:	1144297
	Show dependency tree / graph

Reported:	2014-09-19 03:39 EDT by Murray McAllister
Modified:	2015-11-25 05:16 EST (History)
CC List:	18 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:	A divide-by-zero flaw was found in the way LibVNCServer handled the scaling factor when it was set to "0". A remote attacker could use this flaw to crash the VNC server using a malicious VNC client.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2014-11-11 17:34:04 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2014:1826	normal	SHIPPED_LIVE	Moderate: libvncserver security update	2014-11-11 18:25:37 EST
Red Hat Product Errata	RHSA-2014:1827	normal	SHIPPED_LIVE	Moderate: kdenetwork security update	2014-11-11 21:16:52 EST

Groups: None (edit)

Description Murray McAllister 2014-09-19 03:39:39 EDT

A divide-by-zero flaw was reported in LibVNCServer's scaling factor handling. A VNC client could use this flaw to cause the VNC server to crash.

Upstream commit:

https://github.com/newsoft/libvncserver/commit/05a9bd41a8ec0a9d580a8f420f41718bdd235446

Comment 2 Murray McAllister 2014-09-24 00:20:04 EDT

Acknowledgements:

Red Hat would like to thank oCERT for reporting this issue. oCERT acknowledges Nicolas RUFF as the original reporter.

Comment 3 Murray McAllister 2014-09-24 00:21:20 EDT

Public now:

http://seclists.org/oss-sec/2014/q3/639

Comment 4 Murray McAllister 2014-09-24 00:31:09 EDT

Created libvncserver tracking bugs for this issue:

Affects: fedora-all [bug 1145878]
Affects: epel-5 [bug 1145879]
Affects: epel-7 [bug 1145880]

Comment 5 Murray McAllister 2014-09-24 00:49:14 EDT

Created krfb tracking bugs for this issue:

Affects: fedora-all [bug 1145883]

Comment 6 Murray McAllister 2014-09-24 00:51:19 EDT

krfb advisory:

http://www.kde.org/info/security/advisory-20140923-1.txt

Comment 8 Fedora Update System 2014-09-29 00:06:38 EDT

libvncserver-0.9.10-0.6.20140718git9453be42.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2014-10-01 00:23:33 EDT

libvncserver-0.9.10-0.6.20140718git9453be42.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 10 Fedora Update System 2014-10-03 23:25:09 EDT

libvncserver-0.9.10-0.6.20140718git9453be42.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 11 Fedora Update System 2014-10-08 15:11:32 EDT

krfb-4.11.5-4.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 12 Fedora Update System 2014-10-13 17:38:39 EDT

libvncserver-0.9.10-0.6.20140718git9453be42.el5 has been pushed to the Fedora EPEL 5 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 16 Martin Prpič 2014-11-10 03:59:06 EST

IssueDescription:

A divide-by-zero flaw was found in the way LibVNCServer handled the scaling factor when it was set to "0". A remote attacker could use this flaw to crash the VNC server using a malicious VNC client.

Comment 17 errata-xmlrpc 2014-11-11 13:26:01 EST

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7

Via RHSA-2014:1826 https://rhn.redhat.com/errata/RHSA-2014-1826.html

Comment 18 errata-xmlrpc 2014-11-11 16:17:06 EST

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2014:1827 https://rhn.redhat.com/errata/RHSA-2014-1827.html

Note You need to log in before you can comment on or make changes to this bug.