CVE-2021-26529 : Exploit Details and Defense Strategies
Learn about CVE-2021-26529, a vulnerability in Cesanta Mongoose HTTPS server versions 7.0 and 6.7-6.18 that allows remote attackers to execute an out-of-bounds write attack.
A vulnerability has been identified in Cesanta Mongoose HTTPS server versions 7.0 and 6.7-6.18 that can be exploited by remote attackers. This CVE-2021-26529 allows for a remote out-of-bounds write attack when the memory pool is exhausted. Here's what you need to know about this CVE.
Understanding CVE-2021-26529
This section delves into the details of CVE-2021-26529, shedding light on its impact and implications.
What is CVE-2021-26529?
The mg_tls_init function in Cesanta Mongoose HTTPS server is susceptible to a remote OOB write attack via connection request following memory pool exhaustion.
The Impact of CVE-2021-26529
The impact of this CVE is that it allows remote attackers to execute an out-of-bounds write attack, potentially leading to unauthorized access and further exploitation.
Technical Details of CVE-2021-26529
In this section, we explore the technical aspects of CVE-2021-26529 to understand how the vulnerability operates.
Vulnerability Description
The vulnerability lies in the mg_tls_init function of Cesanta Mongoose HTTPS server versions 7.0 and 6.7-6.18, specifically affecting instances compiled with mbedTLS support.
Affected Systems and Versions
The impacted systems include Cesanta Mongoose HTTPS server versions 7.0 and 6.7-6.18 that were compiled with mbedTLS support.
Exploitation Mechanism
Remote attackers can exploit this vulnerability by sending a connection request after exhausting the memory pool, initiating a remote OOB write attack.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-26529, immediate action and long-term security practices are essential.
Immediate Steps to Take
Immediate steps include applying relevant patches, monitoring network traffic for any suspicious activity, and restricting access to vulnerable systems.
Long-Term Security Practices
Enhancing network security measures, conducting regular security audits, and implementing access controls are vital for long-term security.
Patching and Updates
Regularly apply security patches provided by Cesanta for the Mongoose HTTPS server to address and mitigate CVE-2021-26529.