CVE-2021-36159 : Exploit Details and Defense Strategies
Learn about CVE-2021-36159 impacting libfetch before 2021-07-26. Find out the vulnerability details, impact, affected systems, exploitation mechanism, and mitigation steps.
A vulnerability tracked as CVE-2021-36159 has been identified in libfetch before 2021-07-26, impacting its usage in various products like apk-tools and xbps. The vulnerability arises due to a mishandling of numeric strings in FTP and HTTP protocols.
Understanding CVE-2021-36159
This section will provide insights into the nature and impact of the CVE-2021-36159 vulnerability.
What is CVE-2021-36159?
CVE-2021-36159 involves a scenario where libfetch, used in tools like apk-tools, exhibits an issue where numeric strings are handled inadequately for FTP and HTTP protocols. This mishandling leads to an out-of-bounds read vulnerability during FTP passive mode implementation.
The Impact of CVE-2021-36159
The impact of CVE-2021-36159 is significant as it allows for an out-of-bounds read due to the improper parsing of numeric strings. This can result in potential security risks and exploitation by malicious parties.
Technical Details of CVE-2021-36159
This section will delve into the technical aspects of the CVE-2021-36159 vulnerability.
Vulnerability Description
The vulnerability stems from libfetch's inadequate handling of numeric strings in FTP and HTTP protocols, leading to an out-of-bounds read scenario and a potential security compromise.
Affected Systems and Versions
Systems utilizing libfetch before the patch released on 2021-07-26 are susceptible to CVE-2021-36159. Products like apk-tools and xbps could be impacted by this vulnerability.
Exploitation Mechanism
By exploiting the FTP passive mode implementation in libfetch, threat actors can trigger an out-of-bounds read by manipulating numeric strings, potentially leading to unauthorized access or data leakage.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-36159, immediate steps should be taken along with long-term security practices.
Immediate Steps to Take
Immediately update the affected systems with the latest patch released on 2021-07-26 to address the vulnerability in libfetch and prevent possible exploitation.
Long-Term Security Practices
Incorporate regular security updates and patches into your system maintenance routine to ensure vulnerabilities like CVE-2021-36159 are promptly addressed and resolved.
Patching and Updates
Stay informed about security advisories related to libfetch and ensure timely application of patches and updates to maintain a secure system environment.