CVE-2021-28116 Explained : Impact and Mitigation
Discover CVE-2021-28116 impacting Squid versions 4.14 and 5.x. Learn about the information disclosure risk and potential for remote code execution due to an out-of-bounds read in the WCCP protocol.
Squid through version 4.14 and 5.x through 5.0.5 may allow information disclosure due to an out-of-bounds read in the WCCP protocol. This vulnerability in specific configurations can potentially be exploited for remote code execution.
Understanding CVE-2021-28116
This section provides insights into the nature and impact of CVE-2021-28116.
What is CVE-2021-28116?
CVE-2021-28116 is a vulnerability found in Squid versions 4.14 and 5.x through 5.0.5, which can lead to information disclosure and potentially enable a chain for remote code execution.
The Impact of CVE-2021-28116
The vulnerability has a low severity base score of 3.7 and a high attack complexity. It can result in the disclosure of low confidentiality information with no impact on integrity and availability. No privileges are required for exploitation, and the attack vector is through the network.
Technical Details of CVE-2021-28116
This section delves into the specific technical aspects of the vulnerability.
Vulnerability Description
Squid's versions are affected due to an out-of-bounds read in the WCCP protocol, which under certain configurations, may facilitate unauthorized information access and potential exploitation for remote code execution.
Affected Systems and Versions
The impacted versions include Squid 4.14 and 5.x up to version 5.0.5.
Exploitation Mechanism
In certain configurations, this vulnerability can be leveraged to perform a chain that may ultimately lead to remote code execution.
Mitigation and Prevention
In this section, we discuss the steps to mitigate and prevent the exploitation of CVE-2021-28116.
Immediate Steps to Take
Users are advised to update Squid to a patched version. Additionally, network segmentation and monitoring can help detect and prevent potential exploitation.
Long-Term Security Practices
Implementing regular security updates, conducting security audits, and following best practices can enhance overall system security.
Patching and Updates
Stay informed about security advisories related to Squid, and promptly apply patches and updates to ensure system integrity and security.