--- title: 'USN-6500-2: Squid vulnerabilities | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-6500-2 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-6500-2 --- # USN-6500-2: Squid vulnerabilities Publication date 11 December 2023 Overview Several security issues were fixed in Squid. Releases [18.04 LTS](https://ubuntu.com/security/notices?release=bionic) [16.04 LTS](https://ubuntu.com/security/notices?release=xenial) --- Open side navigation ## Packages * [squid3](https://ubuntu.com/security/cves?package=squid3) - Web proxy cache server ## Details USN-6500-1 fixed several vulnerabilities in Squid. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Original advisory details: Joshua Rogers discovered that Squid incorrectly handled the Gopher protocol. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. Gopher support has been disabled in this update. ([CVE-2023-46728](https://ubuntu.com/security/CVE-2023-46728)) Joshua Rogers discovered that Squid incorrectly handled HTTP Digest Authentication. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. ([CVE-2023-46847](https://ubuntu.com/security/CVE-2023-46847)) ## Update instructions In general, a standard system update will make all the necessary changes. [Learn more about how to get the fixes.](https://ubuntu.com/security/cves/about#security) The problem can be corrected by updating your system to the following package versions: | Ubuntu Release | Package Version | | --- | --- | | 18.04 LTS bionic | [squid](https://launchpad.net/ubuntu/+source/squid3) –  3.5.27-1ubuntu1.14+esm1   Ubuntu Pro | | | | [squid3](https://launchpad.net/ubuntu/+source/squid3) –  3.5.27-1ubuntu1.14+esm1   Ubuntu Pro | | | | 16.04 LTS xenial | [squid](https://launchpad.net/ubuntu/+source/squid3) –  3.5.12-1ubuntu7.16+esm2   Ubuntu Pro | | | | [squid3](https://launchpad.net/ubuntu/+source/squid3) –  3.5.12-1ubuntu7.16+esm2   Ubuntu Pro | | | --- ### Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. [Get Ubuntu Pro](https://ubuntu.com/pro) ## References * [CVE-2023-46847](https://ubuntu.com/security/CVE-2023-46847) * [CVE-2023-46728](https://ubuntu.com/security/CVE-2023-46728) ## Related notices * [USN-6500-1](https://ubuntu.com/security/notices/USN-6500-1)