CVE-2022-34759 : Exploit Details and Defense Strategies

A CWE-787: Out-of-bounds Write vulnerability in Schneider Electric products could lead to a denial of service due to improper HTTP Headers parsing.

Understanding CVE-2022-34759

This CVE impacts Schneider Electric's OPC UA Modicon Communication Module and X80 advanced RTU Communication Module.

What is CVE-2022-34759?

The vulnerability allows for an out-of-bounds write, potentially resulting in a webserver denial of service on affected products.

The Impact of CVE-2022-34759

The vulnerability poses a HIGH availability impact with a CVSS base score of 7.5, categorizing it as HIGH severity.

Technical Details of CVE-2022-34759

The technical details outline the vulnerability description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The flaw arises from improper parsing of HTTP Headers, leading to an out-of-bounds write vulnerability.

Affected Systems and Versions

Impacted products include OPC UA Modicon Communication Module (BMENUA0100) prior to V1.10 and X80 advanced RTU Communication Module (BMENOR2200H) V1.0.

Exploitation Mechanism

The vulnerability can be exploited remotely with a low attack complexity over the network, requiring no user interaction.

Mitigation and Prevention

To address CVE-2022-34759, immediate steps, long-term security practices, and the importance of patching and updates are crucial.

Immediate Steps to Take

Apply vendor-supplied patches promptly to mitigate the vulnerability
Monitor vendor communications for security advisories

Long-Term Security Practices

Regularly update and maintain systems to prevent vulnerabilities
Implement network segmentation and access controls

Patching and Updates

Stay informed about security updates from Schneider Electric
Test patches in a controlled environment before applying to production systems