Vulnerability in squid3 - security update
Summary
DLA-1266-1: squid3 - security update. Affects squid3 versions < 3.1.20-2.2+deb7u8. Fixed in 3.1.20-2.2+deb7u8. How to fix ↓
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Background
Squid is a high-performance proxy caching server for web clients. It is vulnerable to denial of service attacks associated with ESI response processing and intermediate CA certificate downloading.
Vulnerability Detail
The vulnerability, identified as CVE-2018-1000024, is caused by incorrect pointer handling in the Squid custom ESI parser. It allows a remote server to return a crafted ESI response, triggering a denial of service for all clients accessing the Squid service. Another vulnerability, CVE-2018-1000027, is also present due to incorrect pointer handling. It enables a remote client to deliver certain HTTP requests in conjunction with certain trusted server responses involving the processing of ESI responses or downloading of intermediate CA certificates, resulting in a denial of service for all clients accessing the Squid service.
How To Fix
Minimum fixed version
3.1.20-2.2+deb7u8
This is the first release that contains the fix.
sudo apt-get install --only-upgrade squid3Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Conclusion
Upgrading the squid3 packages to version 3.1.20-2.2+deb7u8 or later will fix the vulnerabilities. For further support on vulnerability remediation, contact DevNack.com.
See every vulnerability recorded for squid3 →
FAQ
Squid is a high-performance proxy caching server for web clients. It is commonly used to improve web server performance by caching frequently accessed content.
ESI (Edge Side Includes) is a markup language used to include dynamic content in web pages. ESI response processing refers to the handling of ESI tags and the retrieval of included content.
Intermediate CA certificates are certificates that are used to establish trust between a root CA certificate and end-entity certificates. They are used in the SSL/TLS certificate chain.
The vulnerabilities can be exploited by a remote server returning a crafted ESI response or a remote client delivering certain HTTP requests in conjunction with certain trusted server responses involving ESI responses or intermediate CA certificate downloading.
The vulnerabilities can lead to a denial of service for all clients accessing the Squid service.
Related vulnerabilities
Recent vulnerabilities recorded for squid3.
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