CVE-2019-12524
Critical
Description
An issue was discovered in Squid through 4.7. When handling requests from users, Squid checks its rules to see if the request should be denied. Squid by default comes with rules to block access to the Cache Manager, which serves detailed server information meant for the maintainer. This rule is implemented via url_regex. The handler for url_regex rules URL decodes an incoming request. This allows an attacker to encode their URL to bypass the url_regex check, and gain access to the blocked resource.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Squid
PublishedApr 15, 2020
First seenApr 15, 2020
How to fix
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| squid-cache squid | v ≤ 4.7 | — |
| debian debian_linux | 9.0, 10.0 | — |
| canonical ubuntu_linux | 16.04, 18.04 | — |
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