TigerVNC 1.7.1 VNCSConnectionST.cxx VNCSConnectionST::fence) double free

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability was found in TigerVNC 1.7.1. It has been rated as critical. Affected by this issue is the function VNCSConnectionST::fence) of the file VNCSConnectionST.cxx. The manipulation leads to double free. This vulnerability is referenced as CVE-2017-7393. Remote exploitation of the attack is possible. No exploit is available. It is recommended to apply restrictive firewalling.

Detailsinfo

A vulnerability, which was classified as critical, has been found in TigerVNC 1.7.1. This issue affects the function VNCSConnectionST::fence) of the file VNCSConnectionST.cxx. The manipulation with an unknown input leads to a double free vulnerability. Using CWE to declare the problem leads to CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In TigerVNC 1.7.1 (VNCSConnectionST.cxx VNCSConnectionST::fence), an authenticated client can cause a double free, leading to denial of service or potentially code execution.

The bug was discovered 03/31/2017. The weakness was published 04/01/2017 (GitHub Repository). It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2017-7393 since 03/31/2017. The attack may be initiated remotely. The successful exploitation requires a simple authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 99239 (Fedora 25 : tigervnc (2017-51979161f4)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 276556 (Fedora Security Update for tigervnc (FEDORA-2017-51979161f4)).

Addressing this vulnerability is possible by firewalling . A possible mitigation has been published 6 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (99239) and SecurityFocus (BID 97305†). Similar entries are available at VDB-99157, VDB-99154, VDB-99156 and VDB-99158. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.2

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Double free
CWE: CWE-415 / 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: 99239
Nessus Name: Fedora 25 : tigervnc (2017-51979161f4)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for tigervnc FEDORA-2017-a66ca10c22
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

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

Patch: github.com

Timelineinfo

03/31/2017 🔍
03/31/2017 +0 days 🔍
03/31/2017 +0 days 🔍
03/31/2017 +0 days 🔍
04/01/2017 +1 days 🔍
04/01/2017 +0 days 🔍
04/07/2017 +6 days 🔍
04/07/2017 +0 days 🔍
11/24/2022 +2057 days 🔍

Sourcesinfo

Product: github.com

Advisory: FEDORA-2017-51979161f4
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-7393 (🔍)
GCVE (CVE): GCVE-0-2017-7393
GCVE (VulDB): GCVE-100-99155
SecurityFocus: 97305 - TigerVNC Multiple Security Vulnerabilities
OSVDB: - CVE-2017-7393 - TigerVNC - Double Free Issue

See also: 🔍

Entryinfo

Created: 04/01/2017 10:03
Updated: 11/24/2022 12:01
Changes: 04/01/2017 10:03 (81), 11/24/2022 11:53 (5), 11/24/2022 12:01 (1)
Complete: 🔍
Cache ID: 216::103

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