Critical Assertion Failure in Privoxy Package Leading to Server Crash
Summary
ALPINE-CVE-2021-20272: A flaw was found in privoxy before 3.0.32. An assertion failure could be triggered with a crafted CGI request leading to server crash. Affects privoxy versions < 3.0.32-r0. Fixed in 3.0.32-r0. How to fix ↓
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Background
Privoxy is a non-caching web proxy with advanced filtering capabilities for enhancing privacy, modifying web page data, and managing ads. It is widely used to improve user security and privacy while browsing the internet. However, prior to version 3.0.32, Privoxy was susceptible to a critical vulnerability that could lead to a server crash when handling crafted CGI requests.
Vulnerability Detail
A flaw was identified in Privoxy versions before 3.0.32, where an assertion failure could be triggered by a specially crafted CGI request. This vulnerability can lead to a server crash, potentially disrupting service and exposing users to security risks. The vulnerability has a CVSS score of 7.5, indicating a high severity level, which emphasizes the importance of addressing this issue promptly.
How To Fix
Minimum fixed version
3.0.32-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
As a temporary measure, users can restrict access to the Privoxy service or implement firewall rules to block potentially malicious CGI requests until the package is updated.
Conclusion
The identified vulnerability in Privoxy poses a significant risk, leading to potential server crashes and service disruptions. It is crucial for users to update to the patched version 3.0.32-r0 to mitigate these risks. Implementing temporary workarounds can help maintain service continuity until the update is applied.
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FAQ
The vulnerability can lead to a server crash, disrupting service and potentially exposing sensitive user data.
You can check your Privoxy version by running 'privoxy --version' in the terminal. If it is below 3.0.32, it is affected.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in your software using just a manifest file. Visit https://vulert.com for more information.
Implement firewall rules to restrict access to the Privoxy service and block potentially malicious requests as a temporary workaround.
Detailed information can be found in the CVE database or by visiting the provided source link in the vulnerability report.
References
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