TigerVNC 1.7.1 SSecurityPlain.cxx processMsg) Long Username input validation

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

Summaryinfo

A vulnerability categorized as problematic has been discovered in TigerVNC 1.7.1. This affects the function SSecurityPlain::processMsg) of the file SSecurityPlain.cxx. The manipulation as part of Long Username results in input validation. This vulnerability is identified as CVE-2017-7394. The attack can be executed remotely. There is not any exploit available. Applying restrictive firewalling is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, was found in TigerVNC 1.7.1. Affected is the function SSecurityPlain::processMsg) of the file SSecurityPlain.cxx. The manipulation as part of a Long Username leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. CVE summarizes:

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.

The bug was discovered 03/31/2017. The weakness was released 04/01/2017 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2017-7394 since 03/31/2017. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

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)).

It is possible to mitigate the weakness 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†). Entries connected to this vulnerability are available at VDB-99155, VDB-99157, VDB-99154 and VDB-99158. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.1

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
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: Input validation
CWE: CWE-20
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-2017-7394 (🔍)
GCVE (CVE): GCVE-0-2017-7394
GCVE (VulDB): GCVE-100-99156
SecurityFocus: 97305 - TigerVNC Multiple Security Vulnerabilities
OSVDB: - CVE-2017-7394 - TigerVNC - Denial of Service Issue

See also: 🔍

Entryinfo

Created: 04/01/2017 10:12
Updated: 11/24/2022 12:16
Changes: 04/01/2017 10:12 (81), 11/24/2022 12:07 (5), 11/24/2022 12:16 (1)
Complete: 🔍
Cache ID: 216::103

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