CVE-2021-25668 : Security Advisory and Response
Discover the details of CVE-2021-25668 affecting multiple SCALANCE devices by Siemens. Learn about the impact, affected systems, exploitation mechanism, and mitigation steps to secure your devices.
A vulnerability has been identified in various SCALANCE products by Siemens, potentially allowing an attacker to cause denial-of-service and execute code remotely due to an incorrect processing of POST requests in the webserver.
Understanding CVE-2021-25668
This CVE pertains to a heap-based buffer overflow vulnerability affecting multiple SCALANCE devices of Siemens.
What is CVE-2021-25668?
The vulnerability in SCALANCE devices may allow an attacker to trigger a denial-of-service condition and potentially achieve remote code execution by exploiting a heap-based buffer overflow.
The Impact of CVE-2021-25668
The vulnerability can be exploited by malicious actors to disrupt device services and gain unauthorized access, posing a serious threat to the affected systems.
Technical Details of CVE-2021-25668
The vulnerable SCALANCE products include X200-4P IRT, X201-3P IRT, X202-2 IRT, X204 IRT, X204-2FM, XF201-3P IRT, and more.
Vulnerability Description
The issue arises from the mishandling of POST requests within the webserver, leading to a heap-based buffer overflow that can be abused for malicious purposes.
Affected Systems and Versions
All versions below 5.5.1 and V5.2.5 of the identified SCALANCE devices are affected by this vulnerability.
Exploitation Mechanism
By leveraging the incorrect processing of POST requests, an attacker can exploit this vulnerability to overwrite memory and execute arbitrary code remotely.
Mitigation and Prevention
Organizations and users are advised to take immediate steps to secure their SCALANCE devices against this vulnerability to prevent potential exploitation.
Immediate Steps to Take
It is recommended to apply security patches provided by Siemens and review the necessary configurations to mitigate the risk of exploitation.
Long-Term Security Practices
Implementing network segmentation, access controls, and regular security audits can enhance the overall security posture of the affected systems.
Patching and Updates
Stay updated with security advisories from Siemens and promptly apply patches and updates to address vulnerabilities and strengthen the security of SCALANCE devices.