An issue exists in Squid prior to 4.9. When handling a URN request, a corresponding HTTP request is made. This HTTP request doesn't go through the access checks that incoming HTTP requests go through. This causes all access checks to be bypassed and allows access to restricted HTTP servers, e.g., an attacker can connect to HTTP servers that only listen on localhost.
Vulnerable Product | Search on Vulmon | Subscribe to Product |
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squid-cache squid |
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canonical ubuntu linux 16.04 |
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canonical ubuntu linux 18.04 |
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canonical ubuntu linux 19.04 |
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canonical ubuntu linux 19.10 |
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fedoraproject fedora 30 |
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fedoraproject fedora 31 |
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opensuse leap 15.0 |
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debian debian linux 9.0 |
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debian debian linux 10.0 |