CVE-2021-23177 : Vulnerability Insights and Analysis
CVE-2021-23177 allows a local attacker to change file ACLs in libarchive, leading to privilege escalation. Learn the impact, technical details, and mitigation steps here.
A vulnerability in libarchive could allow a local attacker to change the access control list (ACL) of a file on the system, potentially gaining more privileges.
Understanding CVE-2021-23177
This section will delve into the details of CVE-2021-23177, its impact, technical details, and mitigation strategies.
What is CVE-2021-23177?
CVE-2021-23177 is an improper link resolution vulnerability in libarchive that could be exploited by a local attacker to modify the ACL of a file by providing a malicious archive to a victim user during the extraction process.
The Impact of CVE-2021-23177
The vulnerability can be leveraged by an attacker to escalate privileges on the system by changing the ACL of a targeted file, potentially leading to unauthorized access and control.
Technical Details of CVE-2021-23177
Let's explore the technical aspects of the CVE-2021-23177 vulnerability, including its description, affected systems, and exploitation mechanism.
Vulnerability Description
The flaw arises from an improper link resolution during the extraction of an archive, enabling unauthorized modification of file ACLs.
Affected Systems and Versions
The vulnerability affects libarchive versions prior to 3.5.2, with successful exploitation allowing an attacker to alter file ACLs on the system.
Exploitation Mechanism
An attacker can provide a crafted archive file, triggering the vulnerability when extracted by a victim user. This leads to unauthorized changes in file ACLs, potentially granting elevated privileges.
Mitigation and Prevention
Discover the necessary steps to mitigate the risks associated with CVE-2021-23177 and enhance the security posture of affected systems.
Immediate Steps to Take
Users should update libarchive to version 3.5.2 or later to remediate the vulnerability and prevent potential ACL manipulation attacks.
Long-Term Security Practices
Enforce the principle of least privilege, regularly monitor system ACLs, and maintain timely security updates to thwart similar vulnerabilities in the future.
Patching and Updates
Stay informed about security advisories and promptly apply patches released by vendors to address known vulnerabilities and bolster system security.