TigerVNC up to 1.7 Xvnc Server memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability was found in TigerVNC up to 1.7. It has been classified as problematic. This affects an unknown function of the component Xvnc Server. Performing a manipulation results in memory corruption. This vulnerability is reported as CVE-2016-10207. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, was found in TigerVNC up to 1.7. This affects an unknown code block of the component Xvnc Server. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on availability. The summary by CVE is:

The Xvnc server in TigerVNC allows remote attackers to cause a denial of service (invalid memory access and crash) by terminating a TLS handshake early.

The bug was discovered 01/21/2017. The weakness was disclosed 02/28/2017 by Ruediger Meier and Michal Srb (oss-sec). It is possible to read the advisory at openwall.com. This vulnerability is uniquely identified as CVE-2016-10207 since 02/04/2017. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 38 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 97953 (CentOS 6 : tigervnc (CESA-2017:0630)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157513 (Oracle Enterprise Linux Security Update for tigervnc and fltk (ELSA-2017-2000)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (97953) and SecurityFocus (BID 96012†). The entry VDB-97350 is pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 97953
Nessus Name: CentOS 6 : tigervnc (CESA-2017:0630)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 871165
OpenVAS Name: RedHat Update for tigervnc RHSA-2017:0630-01
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Timelineinfo

01/21/2017 🔍
02/02/2017 +12 days 🔍
02/04/2017 +2 days 🔍
02/28/2017 +24 days 🔍
02/28/2017 +0 days 🔍
03/01/2017 +1 days 🔍
03/24/2017 +23 days 🔍
03/27/2017 +3 days 🔍
09/02/2020 +1255 days 🔍

Sourcesinfo

Advisory: openwall.com
Researcher: Ruediger Meier, Michal Srb
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-10207 (🔍)
GCVE (CVE): GCVE-0-2016-10207
GCVE (VulDB): GCVE-100-97347
SecurityFocus: 96012 - TigerVNC CVE-2016-10207 Denial of Service Vulnerability
OSVDB: - CVE-2016-10207 - TigerVNC - Denial of Service Issue

See also: 🔍

Entryinfo

Created: 03/01/2017 08:12
Updated: 09/02/2020 17:21
Changes: 03/01/2017 08:12 (77), 09/02/2020 17:21 (4)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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