VDB-186041 · CVE-2021-34594 · VDE-2021-051

Beckhoff TwinCAT OPC UA Server/TcOpcUaServer path traversal

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Beckhoff TwinCAT OPC UA Server and TcOpcUaServer. This impacts an unknown function. The manipulation leads to path traversal. This vulnerability is documented as CVE-2021-34594. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Beckhoff TwinCAT OPC UA Server and TcOpcUaServer (affected version not known). This issue affects some unknown functionality. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-23. The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. Impacted is integrity, and availability.

The weakness was released 11/04/2021 as VDE-2021-051. The advisory is shared at cert.vde.com. The identification of this vulnerability is CVE-2021-34594 since 06/10/2021. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Beckhoff

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.1

VulDB Base Score: 3.8
VulDB Temp Score: 3.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (CERT@VDE): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-23 / CWE-22
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/10/2021 🔍
11/04/2021 +147 days 🔍
11/04/2021 +0 days 🔍
11/09/2021 +5 days 🔍

Sourcesinfo

Advisory: VDE-2021-051
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-34594 (🔍)
GCVE (CVE): GCVE-0-2021-34594
GCVE (VulDB): GCVE-100-186041

Entryinfo

Created: 11/04/2021 14:22
Updated: 11/09/2021 14:34
Changes: 11/04/2021 14:22 (47), 11/09/2021 14:29 (2), 11/09/2021 14:34 (7)
Complete: 🔍
Cache ID: 216::103