CVE-2021-28903 : Security Advisory and Response
Understand the CVE-2021-28903 stack overflow vulnerability in libyang <= v1.0.225, triggering denial of service. Learn about its impact, affected systems, and mitigation steps.
A stack overflow vulnerability in libyang <= v1.0.225 has been identified, posing a risk of denial of service by exploiting the function lyxml_parse_mem(). This flaw triggers recursive calls to the lyxml_parse_elem() function, leading to stack space exhaustion and system crash.
Understanding CVE-2021-28903
This section provides insights into the nature and impact of the CVE-2021-28903 vulnerability.
What is CVE-2021-28903?
The CVE-2021-28903 vulnerability in libyang <= v1.0.225 allows attackers to execute a denial-of-service attack by overwhelming the stack space through recursive calls to the lyxml_parse_elem() function.
The Impact of CVE-2021-28903
The exploitation of this vulnerability can result in a system crash due to stack overflow, causing denial of service for legitimate users.
Technical Details of CVE-2021-28903
Explore the technical aspects of the CVE-2021-28903 vulnerability to understand its implications.
Vulnerability Description
The vulnerability arises in libyang <= v1.0.225 due to stack overflow triggered by recursive calls to the lyxml_parse_elem() function, potentially leading to system crashes.
Affected Systems and Versions
All versions up to v1.0.225 of libyang are impacted by this vulnerability, exposing them to the risk of denial-of-service attacks.
Exploitation Mechanism
By exploiting the lyxml_parse_mem() function, threat actors can initiate recursive calls to lyxml_parse_elem(), consuming stack space and causing system instability.
Mitigation and Prevention
Discover the recommended measures to mitigate the risks associated with CVE-2021-28903.
Immediate Steps to Take
System administrators are advised to apply relevant patches and security updates provided by libyang to address the vulnerability and prevent potential exploitation.
Long-Term Security Practices
Implement secure coding practices, conduct regular security assessments, and stay informed about emerging threats to enhance overall cybersecurity posture.
Patching and Updates
Stay vigilant for security advisories and updates from libyang to deploy patches promptly and ensure the protection of systems against known vulnerabilities.