CVE-2021-27380 : What You Need to Know

A vulnerability has been identified in Solid Edge SE2020 and SE2021, allowing attackers to execute code in the context of the current process by exploiting a lack of proper validation of user-supplied data when parsing PAR files.

Understanding CVE-2021-27380

This CVE highlights a security flaw in Siemens' Solid Edge software versions SE2020 and SE2021, which could be leveraged by malicious actors to execute arbitrary code.

What is CVE-2021-27380?

The vulnerability identified in Solid Edge SE2020 (all versions prior to SE2020MP13) and SE2021 (all versions prior to SE2021MP4) arises from insufficient validation of user inputs when processing PAR files. This oversight may lead to an out-of-bounds write beyond the allocated memory space, enabling an attacker to run malicious code.

The Impact of CVE-2021-27380

Exploitation of this vulnerability could result in unauthorized code execution within the current process context. Attackers could potentially gain control of affected systems, compromising their integrity and confidentiality.

Technical Details of CVE-2021-27380

Siemens' Solid Edge SE2020 and SE2021 are susceptible to an out-of-bounds write vulnerability due to inadequate input validation during PAR file parsing.

Vulnerability Description

The flaw allows an attacker to write data beyond the allocated memory, potentially leading to arbitrary code execution.

Affected Systems and Versions

All versions of Solid Edge SE2020 before SE2020MP13 and SE2021 before SE2021MP4 are impacted by this vulnerability.

Exploitation Mechanism

By crafting a malicious PAR file with specially designed data, threat actors can trigger the out-of-bounds write leading to code execution.

Mitigation and Prevention

Organizations can take immediate steps to reduce the risk posed by CVE-2021-27380 and implement long-term security practices to enhance resilience.

Immediate Steps to Take

Apply the latest patches or updates provided by Siemens for Solid Edge SE2020 and SE2021.
Monitor for any suspicious activity or unauthorized code execution attempts.

Long-Term Security Practices

Conduct regular security assessments and vulnerability scans to identify and address weaknesses proactively.
Educate users about safe computing practices and the importance of verifying file sources before opening.

Patching and Updates

Stay informed about security advisories from Siemens and promptly apply any patches or updates released to address CVE-2021-27380.