========================================================================== Ubuntu Security Notice USN-4446-2 August 27, 2020
squid3 regression ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: USN-4446-1 introduced a regression in Squid. Software Description: - squid3: Web proxy cache server Details: USN-4446-1 fixed vulnerabilities in Squid. The update introduced a regression when using Squid with the icap or ecap protocols. This update fixes the problem. We apologize for the inconvenience. Original advisory details: Jeriko One discovered that Squid incorrectly handled caching certain requests. A remote attacker could possibly use this issue to perform cache-injection attacks or gain access to reverse proxy features such as ESI. (CVE-2019-12520) 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. (CVE-2019-12523) Jeriko One discovered that Squid incorrectly handled URL decoding. A remote attacker could possibly use this issue to bypass certain rule checks. (CVE-2019-12524) Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly handled input validation. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2019-18676) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: squid 3.5.27-1ubuntu1.8 Ubuntu 16.04 LTS: squid 3.5.12-1ubuntu7.13 In general, a standard system update will make all the necessary changes. References: https://usn.ubuntu.com/4446-2 https://usn.ubuntu.com/4446-1 https://launchpad.net/bugs/1890265 Package Information: https://launchpad.net/ubuntu/+source/squid3/3.5.27-1ubuntu1.8 https://launchpad.net/ubuntu/+source/squid3/3.5.12-1ubuntu7.13
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