CVE-2021-26194 : Exploit Details and Defense Strategies
Learn about CVE-2021-26194, a critical heap-use-after-free vulnerability discovered in JerryScript 2.4.0, allowing attackers to execute arbitrary code or initiate denial of service attacks.
An issue was discovered in JerryScript 2.4.0, involving a heap-use-after-free vulnerability in the ecma_is_lexical_environment function in the ecma-helpers.c file.
Understanding CVE-2021-26194
This CVE record highlights a critical vulnerability identified in JerryScript 2.4.0, posing a risk of heap-use-after-free exploitation.
What is CVE-2021-26194?
The CVE-2021-26194 vulnerability pertains to a heap-use-after-free flaw found in the ecma_is_lexical_environment function within the ecma-helpers.c file of JerryScript 2.4.0.
The Impact of CVE-2021-26194
The impact of this vulnerability includes the potential for malicious actors to execute arbitrary code or cause a denial of service by triggering a heap-use-after-free condition in affected systems.
Technical Details of CVE-2021-26194
This section covers specific technical aspects of CVE-2021-26194 to better understand the nature of the vulnerability.
Vulnerability Description
The vulnerability arises due to improper handling of memory operations in the ecma_is_lexical_environment function, leading to a heap-use-after-free scenario.
Affected Systems and Versions
The affected system is JerryScript 2.4.0, with the specific vulnerable component being the ecma-helpers.c file.
Exploitation Mechanism
Exploitation of this vulnerability involves crafting and executing malicious code that triggers the heap-use-after-free condition through the ecma_is_lexical_environment function.
Mitigation and Prevention
Employing suitable mitigation strategies is crucial to safeguard systems from the risks posed by CVE-2021-26194.
Immediate Steps to Take
Immediately updating JerryScript to a patched version that addresses the identified heap-use-after-free vulnerability is recommended.
Long-Term Security Practices
Incorporating secure coding practices, regular security assessments, and maintaining up-to-date software can enhance the overall security posture and help prevent similar vulnerabilities.
Patching and Updates
Regularly monitoring for security advisories and promptly applying patches released by JerryScript can mitigate the risk of exploitation through CVE-2021-26194.