Advisory Published

USN-4213-1: Squid vulnerabilities

First published: Wed Dec 04 2019(Updated: )

Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly handled certain URN requests. A remote attacker could possibly use this issue to bypass access checks and access restricted servers. This issue was only addressed in Ubuntu 19.04 and Ubuntu 19.10. (CVE-2019-12523) Jeriko One discovered that Squid incorrectly handed URN responses. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2019-12526) Alex Rousskov discovered that Squid incorrectly handled certain strings. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 19.04. (CVE-2019-12854) Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly handled certain input. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue was only addressed in Ubuntu 19.04 and Ubuntu 19.10. (CVE-2019-18676) Kristoffer Danielsson discovered that Squid incorrectly handled certain messages. This issue could result in traffic being redirected to origins it should not be delivered to. (CVE-2019-18677) Régis Leroy discovered that Squid incorrectly handled certain HTTP request headers. A remote attacker could use this to smuggle HTTP requests and corrupt caches with arbitrary content. (CVE-2019-18678) David Fifield discovered that Squid incorrectly handled HTTP Digest Authentication. A remote attacker could possibly use this issue to obtain pointer contents and bypass ASLR protections. (CVE-2019-18679)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/squid<4.8-1ubuntu2.1
4.8-1ubuntu2.1
Ubuntu Ubuntu=19.10
All of
ubuntu/squid<4.4-1ubuntu2.3
4.4-1ubuntu2.3
Ubuntu Ubuntu=19.04
All of
ubuntu/squid3<3.5.27-1ubuntu1.4
3.5.27-1ubuntu1.4
Ubuntu Ubuntu=18.04
All of
ubuntu/squid3<3.5.12-1ubuntu7.9
3.5.12-1ubuntu7.9
Ubuntu Ubuntu=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this advisory?

    The vulnerability ID for this advisory is CVE-2019-12523.

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

    The severity of CVE-2019-12523 is not mentioned in the advisory.

  • How does the Squid vulnerability CVE-2019-12523 work?

    The Squid vulnerability CVE-2019-12523 allows a remote attacker to bypass access checks and access restricted servers by handling certain URN requests incorrectly.

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

    Squid versions 3.5.27-1ubuntu1.4 and 3.5.12-1ubuntu7.9 are affected by CVE-2019-12523.

  • How can I fix the Squid vulnerability CVE-2019-12523?

    To fix the Squid vulnerability CVE-2019-12523, update to Squid version 4.8-1ubuntu2.1 for Ubuntu 19.04 and Ubuntu 19.10, or update to Squid version 4.4-1ubuntu2.3 for Ubuntu 18.04.

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