Squid - Header Smuggling Attack Vulnerability
Summary
DLA-558-1: squid - security update. Affects squid versions < 2.7.STABLE9-4.1+deb7u2. Fixed in 2.7.STABLE9-4.1+deb7u2. How to fix ↓
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Background
Squid is a caching proxy that is widely used to improve web server performance by caching frequently accessed web content. It acts as an intermediary between clients and servers, storing copies of web pages and serving them to clients upon request. Squid is a popular choice for organizations looking to optimize their network traffic and reduce bandwidth usage. However, the Squid version 2.7.STABLE9 is vulnerable to a header smuggling attack, which can lead to cache poisoning and bypass of same-origin security policy in Squid and some client browsers.
Vulnerability Detail
The vulnerability, identified as CVE-2016-4554, was discovered by Jianjun Chen. It allows an attacker to manipulate HTTP headers in a way that can deceive Squid and client browsers, potentially leading to cache poisoning and bypassing of same-origin security policy. This could enable an attacker to inject malicious content into the cache or bypass security restrictions, compromising the integrity and confidentiality of the system. The vulnerability affects Squid version 2.7.STABLE9.
How To Fix
Minimum fixed version
2.7.STABLE9-4.1+deb7u2
This is the first release that contains the fix.
sudo apt-get install --only-upgrade squidTip — 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 recommended to apply the fix mentioned above to mitigate the risk.
Conclusion
The Squid caching proxy version 2.7.STABLE9 is vulnerable to a header smuggling attack, which can lead to cache poisoning and bypass of same-origin security policy. It is crucial to upgrade the Squid package to version 2.7.STABLE9-4.1+deb7u2 or later to mitigate the risk. No known workaround is available for this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
Squid is a caching proxy that improves web server performance by caching frequently accessed web content.
A header smuggling attack is a technique used by attackers to manipulate HTTP headers in a way that can deceive the proxy server and client browsers.
Cache poisoning is a type of attack where an attacker injects malicious content into the cache, which is then served to clients, compromising their security.
The same-origin security policy is a security mechanism that restricts how a document or script loaded from one origin can interact with resources from another origin.
You can use Vulert's playground (https://vulert.com/scanner) to check if your Squid installation is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will analyze the dependencies and alert you if any vulnerabilities are found.
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