CVE-2019-12523

Description

An issue was discovered in Squid before 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.

9.1

CVSS

Severity: Critical

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.77% Top 30%

Vendor Advisory ubuntu.com Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory debian.org Vendor Advisory ubuntu.com

Affected: n/a n/a

References

Link	Tags
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html	broken link
http://www.squid-cache.org/Advisories/SQUID-2019_8.txt	third party advisory
https://bugzilla.suse.com/show_bug.cgi?id=1156329	issue tracking third party advisory
https://usn.ubuntu.com/4213-1/	third party advisory vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/	vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/	vendor advisory
https://www.debian.org/security/2020/dsa-4682	third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html	third party advisory mailing list
https://usn.ubuntu.com/4446-1/	third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2019-12523?: CVE-2019-12523 has been scored as a critical severity vulnerability.
How to fix CVE-2019-12523?: To fix CVE-2019-12523, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-12523 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2019-12523 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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