CVE-2021-20213 : Security Advisory and Response
Discover the details of CVE-2021-20213, a vulnerability in Privoxy versions before 3.0.29. Learn about its impact, affected systems, exploitation, and mitigation steps.
A detailed overview of CVE-2021-20213, a vulnerability found in Privoxy before version 3.0.29, impacting systems that have 'accept-intercepted-requests' enabled.
Understanding CVE-2021-20213
This section delves into the specifics of the CVE-2021-20213 vulnerability found in Privoxy.
What is CVE-2021-20213?
CVE-2021-20213 is a flaw in Privoxy versions before 3.0.29, involving a NULL-pointer dereference that could lead to a crash under certain conditions. The issue arises when Privoxy fails to retrieve the request destination from the Host header due to a memory allocation failure.
The Impact of CVE-2021-20213
The impact of this vulnerability is significant as it could potentially cause a denial-of-service (DoS) condition or system instability, particularly when 'accept-intercepted-requests' is activated.
Technical Details of CVE-2021-20213
Explore the technical aspects of CVE-2021-20213 to understand its implications better.
Vulnerability Description
The vulnerability involves a NULL-pointer dereference in Privoxy that triggers a crash due to failed memory allocation when specific conditions are met.
Affected Systems and Versions
Privoxy versions prior to 3.0.29 are affected by this vulnerability, particularly if 'accept-intercepted-requests' is enabled.
Exploitation Mechanism
Exploiting this vulnerability requires an attacker to send a crafted request to a vulnerable Privoxy instance, causing it to crash or become unresponsive.
Mitigation and Prevention
Learn how to mitigate the risks associated with CVE-2021-20213 and prevent potential exploitation.
Immediate Steps to Take
Users are advised to update Privoxy to version 3.0.29 or later to address the vulnerability. Additionally, disabling 'accept-intercepted-requests' can reduce the attack surface.
Long-Term Security Practices
Implementing regular security updates and monitoring CVE announcements can help maintain a secure environment and protect against known vulnerabilities.
Patching and Updates
Stay informed about security patches released by Privoxy developers and apply them promptly to ensure the protection of your systems.