RealVNC 5.0.6 on UNIX/Linux Xvnc access control

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in RealVNC 5.0.6 on UNIX/Linux. Affected by this vulnerability is an unknown functionality of the component Xvnc. Such manipulation leads to access control. This vulnerability is referenced as CVE-2013-6886. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in RealVNC 5.0.6 on UNIX/Linux and classified as problematic. Affected by this issue is an unknown code block of the component Xvnc. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, integrity, and availability. CVE summarizes:

RealVNC VNC 5.0.6 on Mac OS X, Linux, and UNIX allows local users to gain privileges via a crafted argument to the (1) vncserver, (2) vncserver-x11, or (3) Xvnc helper.

The weakness was published 12/19/2013 as not defined release notes (Website). The advisory is shared for download at realvnc.com. This vulnerability is handled as CVE-2013-6886 since 11/28/2013. The exploitation is known to be difficult. The attack needs to be approached locally. The requirement for exploitation is a simple authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 71884 (RealVNC < 5.0.7 Multiple Local Privilege Escalations), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Misc. and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 121693 (RealVNC Multiple Privilege Escalation Vulnerabilities).

Upgrading to version 5.0.7 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (71884), SecurityFocus (BID 64560†) and OSVDB (101481†). Similar entries are available at VDB-11661 and VDB-11662. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.3

VulDB Base Score: 4.5
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 71884
Nessus Name: RealVNC < 5.0.7 Multiple Local Privilege Escalations
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: RealVNC 5.0.7

Timelineinfo

11/28/2013 🔍
12/19/2013 +21 days 🔍
12/19/2013 +0 days 🔍
12/27/2013 +8 days 🔍
12/30/2013 +3 days 🔍
01/09/2014 +10 days 🔍
12/23/2024 +4001 days 🔍

Sourcesinfo

Advisory: realvnc.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2013-6886 (🔍)
GCVE (CVE): GCVE-0-2013-6886
GCVE (VulDB): GCVE-100-11660
SecurityFocus: 64560
OSVDB: 101481

See also: 🔍

Entryinfo

Created: 12/30/2013 11:19
Updated: 12/23/2024 03:39
Changes: 12/30/2013 11:19 (62), 05/01/2019 06:42 (1), 12/23/2024 03:39 (20)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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