{"id":"USN-4446-2","aliases":[],"status":"published","title":"squid3 regression","description":"USN-4446-1 fixed vulnerabilities in Squid. The update introduced a\nregression when using Squid with the icap or ecap protocols. This update\nfixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Jeriko One discovered that Squid incorrectly handled caching certain\n requests. A remote attacker could possibly use this issue to perform\n cache-injection attacks or gain access to reverse proxy features such as\n ESI. (CVE-2019-12520)\n \n Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly\n handled certain URN requests. A remote attacker could possibly use this\n issue to bypass access checks. (CVE-2019-12523)\n \n Jeriko One discovered that Squid incorrectly handled URL decoding. A remote\n attacker could possibly use this issue to bypass certain rule checks.\n (CVE-2019-12524)\n \n Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly\n handled input validation. A remote attacker could use this issue to cause\n Squid to crash, resulting in a denial of service. (CVE-2019-18676)","facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2020-08-27T10:46:21Z","modified":"2026-02-10T04:41:54Z","fixes":[{"ecosystem":"Ubuntu:16.04:LTS","package":"squid3","fixed_in":["3.5.12-1ubuntu7.13"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"squid3","fixed_in":["3.5.27-1ubuntu1.8"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"squid3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.12-1ubuntu7.13"}]}],"versions":["3.3.8-1ubuntu16","3.3.8-1ubuntu17","3.5.12-1ubuntu6","3.5.12-1ubuntu7","3.5.12-1ubuntu7.1","3.5.12-1ubuntu7.2","3.5.12-1ubuntu7.3","3.5.12-1ubuntu7.4","3.5.12-1ubuntu7.5","3.5.12-1ubuntu7.6","3.5.12-1ubuntu7.7","3.5.12-1ubuntu7.8","3.5.12-1ubuntu7.9","3.5.12-1ubuntu7.10","3.5.12-1ubuntu7.11","3.5.12-1ubuntu7.12"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"squid3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.27-1ubuntu1.8"}]}],"versions":["3.5.23-5ubuntu1","3.5.23-5ubuntu2","3.5.27-1ubuntu1","3.5.27-1ubuntu1.1","3.5.27-1ubuntu1.2","3.5.27-1ubuntu1.3","3.5.27-1ubuntu1.4","3.5.27-1ubuntu1.5","3.5.27-1ubuntu1.6","3.5.27-1ubuntu1.7"]}],"references":[{"url":"https://ubuntu.com/security/notices/USN-4446-2","tags":["advisory"]},{"url":"https://launchpad.net/bugs/1890265","tags":["report"]}],"sources":{"osv":[{"id":"USN-4446-2","title":"squid3 regression","description":"USN-4446-1 fixed vulnerabilities in Squid. The update introduced a\nregression when using Squid with the icap or ecap protocols. This update\nfixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Jeriko One discovered that Squid incorrectly handled caching certain\n requests. A remote attacker could possibly use this issue to perform\n cache-injection attacks or gain access to reverse proxy features such as\n ESI. (CVE-2019-12520)\n \n Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly\n handled certain URN requests. A remote attacker could possibly use this\n issue to bypass access checks. (CVE-2019-12523)\n \n Jeriko One discovered that Squid incorrectly handled URL decoding. A remote\n attacker could possibly use this issue to bypass certain rule checks.\n (CVE-2019-12524)\n \n Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly\n handled input validation. A remote attacker could use this issue to cause\n Squid to crash, resulting in a denial of service. (CVE-2019-18676)\n","status":"published","published":"2020-08-27T10:46:21Z","modified":"2026-02-10T04:41:54Z","updated_at":"2026-11-02T16:58:14.547547Z"}]}}