CVE-2021-27419 : Exploit Details and Defense Strategies
Learn about CVE-2021-27419, a vulnerability in uClibc-ng versions before 1.0.37, leading to potential memory allocation issues and unexpected behaviors. Mitigation steps and impact details included.
This article provides detailed information about CVE-2021-27419, a vulnerability in uClibc-ng versions prior to 1.0.37, leading to an integer overflow or wraparound in the malloc-simple function. Learn about the impact, technical details, mitigation steps, and more.
Understanding CVE-2021-27419
CVE-2021-27419 is a vulnerability in uClibc-ng versions prior to 1.0.37 that can result in an integer wrap-around in the malloc-simple function. This can lead to arbitrary memory allocation and potentially cause unexpected behaviors such as crashes or remote code injection/execution.
What is CVE-2021-27419?
uClibc-ng versions earlier than 1.0.37 are vulnerable to integer wrap-around in the malloc-simple function. Improper memory allocation due to this vulnerability can result in arbitrary memory allocation, leading to unexpected behaviors like crashes or remote code injection/execution.
The Impact of CVE-2021-27419
The vulnerability has a CVSS v3.1 base score of 7.3 (High severity) with low confidentiality, integrity, and availability impacts. It requires no special privileges for exploitation and can be triggered over a network with low attack complexity.
Technical Details of CVE-2021-27419
Vulnerability Description
The vulnerability involves integer wrap-around in the malloc-simple function of uClibc-ng versions before 1.0.37, causing improper memory allocation and potentially allowing for arbitrary memory allocation.
Affected Systems and Versions
The vulnerability affects uClibc-ng versions prior to 1.0.37.
Exploitation Mechanism
Exploitation of this vulnerability can lead to arbitrary memory allocation, resulting in unexpected behaviors like crashes or enabling remote code injection/execution.
Mitigation and Prevention
Immediate Steps to Take
Users are advised to update uClibc-ng to version 1.0.37 or newer to mitigate the vulnerability and prevent potential exploitation.
Long-Term Security Practices
Implementing secure coding practices and regularly updating software libraries can help prevent similar vulnerabilities in the future.
Patching and Updates
A solution to this vulnerability is to apply the available update for uClibc-ng, specifically version 1.0.37 or above.