Denial of Service Vulnerability in Privoxy
Summary
CVE-2021-20217: A flaw was found in Privoxy in versions before 3.0.31. Affects privoxy versions < 3.0.31-r0. Fixed in 3.0.31-r0. How to fix ↓
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Background
Privoxy is an open-source web proxy server that provides advanced filtering capabilities for enhancing privacy, security, and anonymity while browsing the internet. It acts as an intermediary between the user's device and the web server, filtering and modifying web page content according to predefined rules. Privoxy is widely used to block ads, remove tracking cookies, and protect against various web-based threats. However, a vulnerability has been discovered in Privoxy that could potentially lead to a denial of service (DoS) attack.
Vulnerability Detail
The vulnerability, identified as CVE-2021-20217, exists in Privoxy versions prior to 3.0.31. It is triggered by a crafted CGI request, causing an assertion failure that can result in a DoS condition. An attacker could exploit this vulnerability to disrupt the availability of the Privoxy service, rendering it unresponsive and potentially impacting the overall system availability. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 7.5, indicating a high severity level.
How To Fix
Minimum fixed version
3.0.31-r0
This is the first release that contains the fix.
sudo apk add --upgrade privoxyTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no known workaround for this vulnerability. It is essential to apply the official patch or update to the latest version of Privoxy to mitigate the risk of exploitation.
Conclusion
The vulnerability in Privoxy versions prior to 3.0.31 can lead to a denial of service (DoS) condition. It is crucial to update Privoxy to the latest version or apply the official patch to mitigate the risk of exploitation. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for privoxy →
FAQ
Privoxy is an open-source web proxy server that enhances privacy, security, and anonymity while browsing the internet. It filters and modifies web page content according to predefined rules.
This vulnerability can lead to a denial of service (DoS) condition, potentially rendering the Privoxy service unresponsive and impacting system availability.
To fix this vulnerability, update Privoxy to version 3.0.31 or later by following the official upgrade instructions provided by the Privoxy project.
No, there is no known workaround for this vulnerability. It is crucial to apply the official patch or update to the latest version of Privoxy.
The CVSS score for this vulnerability is 7.5, indicating a high severity level.
References
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