CVE-2021-21827 : Vulnerability Insights and Analysis

A heap-based buffer overflow vulnerability found in the XML Decompression DecodeTreeBlock feature of AT&T Labs Xmill 0.7 allows attackers to execute malicious code by providing a specially crafted file.

Understanding CVE-2021-21827

This section provides insights into the vulnerability's impact, technical details, and mitigation strategies.

What is CVE-2021-21827?

The vulnerability in AT&T Labs Xmill 0.7's XML Decompression DecodeTreeBlock function enables attackers to trigger a heap-based buffer overflow using a malicious file.

The Impact of CVE-2021-21827

With a CVSS base score of 8.1, this high-severity vulnerability can be exploited remotely without requiring user interaction. Attackers can compromise confidentiality, integrity, and availability.

Technical Details of CVE-2021-21827

Learn more about the specifics of the vulnerability for better understanding and proactive defense.

Vulnerability Description

During XMI file decompression, a UINT32 value is read as the buffer length without proper validation, leading to a buffer overflow condition.

Affected Systems and Versions

AT&T Labs Xmill 0.7 and Schneider Electric EcoStruxure Control Expert 15 are impacted by this vulnerability.

Exploitation Mechanism

Attackers exploit the vulnerable DecodeTreeBlock function by providing a malicious file to trigger the heap-based buffer overflow.

Mitigation and Prevention

Discover the necessary steps to secure your systems against CVE-2021-21827 and similar threats.

Immediate Steps to Take

Implement network-level controls, monitor for any anomalous activities, and restrict file inputs to mitigate the risk of exploitation.

Long-Term Security Practices

Enforce secure coding practices, conduct regular security assessments, and educate users on file handling best practices to enhance overall security posture.

Patching and Updates

Stay informed about security updates and patches released by the vendor to address the vulnerability in AT&T Labs Xmill 0.7.