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Test ID:
Category:Web application abuses
Title:Squid Proxy Cache < 4.10 Cache Poisoning Vulnerability
Summary:Squid is prone to a cache poisoning vulnerability.
Squid is prone to a cache poisoning vulnerability.

Vulnerability Insight:
When receiving a request, Squid checks its cache to see if it can serve up a
response. It does this by making a MD5 hash of the absolute URL of the request. If found, it servers the request.
The absolute URL can include the decoded UserInfo (username and password) for certain protocols. This decoded
info is prepended to the domain. This allows an attacker to provide a username that has special characters to
delimit the domain, and treat the rest of the URL as a path or query string. An attacker could first make a
request to their domain using an encoded username, then when a request for the target domain comes in that
decodes to the exact URL, it will serve the attacker's HTML instead of the real HTML. On Squid servers that also
act as reverse proxies, this allows an attacker to gain access to features that only reverse proxies can use,
such as ESI.

Affected Software/OS:
Squid versions prior to 4.10.

Update to version 4.10 or later.

CVSS Score:

CVSS Vector:

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2019-12520
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