CVE-2021-42019 : Exploit Details and Defense Strategies

A vulnerability has been identified in Siemens RUGGEDCOM devices that could allow an attacker to allocate a small size instead of the requested larger amount due to an integer-wrap around issue.

Understanding CVE-2021-42019

The vulnerability affects multiple Siemens RUGGEDCOM products, potentially exposing them to security risks.

What is CVE-2021-42019?

The vulnerability arises due to the failure to check memory boundaries during the allocation of partition size within a third-party component.

The Impact of CVE-2021-42019

If exploited, an attacker could request a large memory allocation leading to an integer-wrap around, resulting in a smaller size being allocated instead.

Technical Details of CVE-2021-42019

The following technical details provide a more in-depth understanding of the vulnerability.

Vulnerability Description

The flaw allows an attacker to trigger an integer-wrap around, leading to improper memory allocation.

Affected Systems and Versions

Siemens RUGGEDCOM i800, i800NC, i801, i801NC, i802, and more.
Versions affected are typically < V4.3.8 or < V5.6.0.

Exploitation Mechanism

By manipulating the memory allocation process, an attacker can exploit the integer-wrap around to force smaller memory allocation.

Mitigation and Prevention

Taking immediate action and establishing long-term security practices can help mitigate the risks associated with CVE-2021-42019.

Immediate Steps to Take

Update affected Siemens RUGGEDCOM devices to versions V4.3.8 or V5.6.0 and above.
Implement network segmentation to limit the impact of any potential exploitation.

Long-Term Security Practices

Regularly monitor security advisories from Siemens for any new updates or patches.
Conduct periodic security audits and penetration testing to identify and address vulnerabilities.

Patching and Updates

Apply recommended patches and updates provided by Siemens to address the vulnerability.