critical
9.1
Advisory Published
Updated

CVE-2019-12523

First published: Tue Nov 26 2019(Updated: )

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.

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Squid-Cache Squid>=3.0<=3.5.28
Squid-Cache Squid>=4.0<=4.8
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=19.04
Canonical Ubuntu Linux=19.10
Fedoraproject Fedora=30
Fedoraproject Fedora=31
openSUSE Leap=15.0
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Canonical Ubuntu Linux=16.04
ubuntu/squid<4.4-1ubuntu2.3
4.4-1ubuntu2.3
ubuntu/squid<4.8-1ubuntu2.1
4.8-1ubuntu2.1
ubuntu/squid<4.9-2ubuntu1
4.9-2ubuntu1
ubuntu/squid<4.9-2ubuntu1
4.9-2ubuntu1
ubuntu/squid<4.9-2ubuntu1
4.9-2ubuntu1
ubuntu/squid<4.9-1
4.9-1
ubuntu/squid3<3.5.27-1ubuntu1.7
3.5.27-1ubuntu1.7
ubuntu/squid3<3.5.12-1ubuntu7.12
3.5.12-1ubuntu7.12
debian/squid
4.6-1+deb10u7
4.6-1+deb10u10
4.13-10+deb11u2
4.13-10+deb11u3
5.7-2
5.7-2+deb12u1
6.6-1
6.9-1

Remedy

http://www.squid-cache.org/Versions/v4/changesets/squid-4-fbbdf75efd7a5cc244b4886a9d42ea458c5a3a73.patch

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2019-12523?

    CVE-2019-12523 is a vulnerability in Squid before version 4.9 that allows bypassing access checks and accessing restricted HTTP servers.

  • What is the severity of CVE-2019-12523?

    The severity of CVE-2019-12523 is critical with a CVSS score of 9.1.

  • How does CVE-2019-12523 impact Squid?

    CVE-2019-12523 impacts Squid by allowing access to restricted HTTP servers and bypassing access checks.

  • What versions of Squid are affected by CVE-2019-12523?

    Versions before 4.9 of Squid are affected by CVE-2019-12523.

  • How do I fix CVE-2019-12523?

    Update Squid to version 4.9 or later to fix CVE-2019-12523.

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