Bug 1120122 - (CVE-2018-20021) VUL-0: CVE-2018-20021: LibVNCServer: Infinite loop in VNC client code allows for denial of service
(CVE-2018-20021)
VUL-0: CVE-2018-20021: LibVNCServer: Infinite loop in VNC client code allows ...
Status: RESOLVED FIXED
Classification: Novell Products
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents
unspecified
Other Other
: P3 - Medium : Normal
: ---
Assigned To: Security Team bot
Security Team bot
https://smash.suse.de/issue/221458/
CVSSv3:RedHat:CVE-2018-20021:6.5:(AV:...
:
Depends on:
Blocks:
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Reported: 2018-12-20 17:56 UTC by Alexander Bergmann
Modified: 2019-04-29 10:16 UTC (History)
2 users (show)

See Also:
Found By: Security Response Team
Services Priority:
Business Priority:
Blocker: ---
Marketing QA Status: ---
IT Deployment: ---


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Description Alexander Bergmann 2018-12-20 17:56:27 UTC
rh#1661120 / CVE-2018-20021

LibVNC before commit c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c contains a CWE-835: Infinite loop vulnerability in VNC client code. Vulnerability allows attacker to consume excessive amount of resources like CPU and RAM

External Reference:
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-031-libvnc-infinite-loop/

Upstream Issue:
https://github.com/LibVNC/libvncserver/issues/251

Upstream Patch:
https://github.com/LibVNC/libvncserver/commit/c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c

References:
https://bugzilla.redhat.com/show_bug.cgi?id=1661120
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-20021
http://people.canonical.com/~ubuntu-security/cve/2018/CVE-2018-20021.html
Comment 1 Alexander Bergmann 2018-12-20 17:58:39 UTC
openSUSE x11vnc is also affected.
Comment 2 Petr Gajdos 2019-01-03 16:27:51 UTC
Will submit for 15,12,11/LibVNCServer.
Comment 3 Petr Gajdos 2019-01-03 16:36:55 UTC
Submitted also to devel project as 0.9.12 is not out yet (sr#662702).

I believe all fixed.
Comment 5 Swamp Workflow Management 2019-01-10 20:10:57 UTC
SUSE-SU-2019:0060-1: An update that fixes 9 vulnerabilities is now available.

Category: security (important)
Bug References: 1120114,1120115,1120116,1120117,1120118,1120119,1120120,1120121,1120122
CVE References: CVE-2018-15126,CVE-2018-15127,CVE-2018-20019,CVE-2018-20020,CVE-2018-20021,CVE-2018-20022,CVE-2018-20023,CVE-2018-20024,CVE-2018-6307
Sources used:
SUSE OpenStack Cloud 7 (src):    LibVNCServer-0.9.9-17.8.1
SUSE Linux Enterprise Software Development Kit 12-SP4 (src):    LibVNCServer-0.9.9-17.8.1
SUSE Linux Enterprise Software Development Kit 12-SP3 (src):    LibVNCServer-0.9.9-17.8.1
SUSE Linux Enterprise Server for SAP 12-SP2 (src):    LibVNCServer-0.9.9-17.8.1
SUSE Linux Enterprise Server 12-SP4 (src):    LibVNCServer-0.9.9-17.8.1
SUSE Linux Enterprise Server 12-SP3 (src):    LibVNCServer-0.9.9-17.8.1
SUSE Linux Enterprise Server 12-SP2-LTSS (src):    LibVNCServer-0.9.9-17.8.1
SUSE Linux Enterprise Server 12-SP2-BCL (src):    LibVNCServer-0.9.9-17.8.1
SUSE Linux Enterprise Server 12-SP1-LTSS (src):    LibVNCServer-0.9.9-17.8.1
SUSE Linux Enterprise Server 12-LTSS (src):    LibVNCServer-0.9.9-17.8.1
SUSE Enterprise Storage 4 (src):    LibVNCServer-0.9.9-17.8.1
Comment 6 Swamp Workflow Management 2019-01-11 14:10:35 UTC
SUSE-SU-2019:13927-1: An update that fixes 8 vulnerabilities is now available.

Category: security (important)
Bug References: 1120114,1120115,1120116,1120117,1120118,1120120,1120121,1120122
CVE References: CVE-2018-15126,CVE-2018-15127,CVE-2018-20019,CVE-2018-20020,CVE-2018-20021,CVE-2018-20022,CVE-2018-20024,CVE-2018-6307
Sources used:
SUSE Linux Enterprise Software Development Kit 11-SP4 (src):    LibVNCServer-0.9.1-160.6.1
SUSE Linux Enterprise Server 11-SP4 (src):    LibVNCServer-0.9.1-160.6.1
SUSE Linux Enterprise Server 11-SP3-LTSS (src):    LibVNCServer-0.9.1-160.6.1
SUSE Linux Enterprise Point of Sale 11-SP3 (src):    LibVNCServer-0.9.1-160.6.1
SUSE Linux Enterprise Debuginfo 11-SP4 (src):    LibVNCServer-0.9.1-160.6.1
SUSE Linux Enterprise Debuginfo 11-SP3 (src):    LibVNCServer-0.9.1-160.6.1
Comment 7 Swamp Workflow Management 2019-01-11 14:50:38 UTC
This is an autogenerated message for OBS integration:
This bug (1120122) was mentioned in
https://build.opensuse.org/request/show/664669 Factory / LibVNCServer
Comment 8 Swamp Workflow Management 2019-01-11 20:12:34 UTC
SUSE-SU-2019:0080-1: An update that fixes 9 vulnerabilities is now available.

Category: security (important)
Bug References: 1120114,1120115,1120116,1120117,1120118,1120119,1120120,1120121,1120122
CVE References: CVE-2018-15126,CVE-2018-15127,CVE-2018-20019,CVE-2018-20020,CVE-2018-20021,CVE-2018-20022,CVE-2018-20023,CVE-2018-20024,CVE-2018-6307
Sources used:
SUSE Linux Enterprise Workstation Extension 15 (src):    LibVNCServer-0.9.10-4.3.1
SUSE Linux Enterprise Module for Packagehub Subpackages 15 (src):    LibVNCServer-0.9.10-4.3.1
SUSE Linux Enterprise Module for Open Buildservice Development Tools 15 (src):    LibVNCServer-0.9.10-4.3.1
Comment 9 Swamp Workflow Management 2019-01-12 02:16:38 UTC
openSUSE-SU-2019:0045-1: An update that fixes 9 vulnerabilities is now available.

Category: security (important)
Bug References: 1120114,1120115,1120116,1120117,1120118,1120119,1120120,1120121,1120122
CVE References: CVE-2018-15126,CVE-2018-15127,CVE-2018-20019,CVE-2018-20020,CVE-2018-20021,CVE-2018-20022,CVE-2018-20023,CVE-2018-20024,CVE-2018-6307
Sources used:
openSUSE Leap 42.3 (src):    LibVNCServer-0.9.9-16.6.1
Comment 10 Swamp Workflow Management 2019-01-17 23:10:57 UTC
openSUSE-SU-2019:0053-1: An update that fixes 9 vulnerabilities is now available.

Category: security (important)
Bug References: 1120114,1120115,1120116,1120117,1120118,1120119,1120120,1120121,1120122
CVE References: CVE-2018-15126,CVE-2018-15127,CVE-2018-20019,CVE-2018-20020,CVE-2018-20021,CVE-2018-20022,CVE-2018-20023,CVE-2018-20024,CVE-2018-6307
Sources used:
openSUSE Leap 15.0 (src):    LibVNCServer-0.9.10-lp150.3.3.1
Comment 11 Marcus Meissner 2019-01-29 07:42:17 UTC
released
Comment 12 Swamp Workflow Management 2019-04-29 10:16:43 UTC
SUSE-SU-2019:0060-2: An update that fixes 9 vulnerabilities is now available.

Category: security (important)
Bug References: 1120114,1120115,1120116,1120117,1120118,1120119,1120120,1120121,1120122
CVE References: CVE-2018-15126,CVE-2018-15127,CVE-2018-20019,CVE-2018-20020,CVE-2018-20021,CVE-2018-20022,CVE-2018-20023,CVE-2018-20024,CVE-2018-6307
Sources used:
SUSE Linux Enterprise Server for SAP 12-SP1 (src):    LibVNCServer-0.9.9-17.8.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.