========================================================================== Ubuntu Security Notice USN-5259-3 May 11, 2022
cron regression ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS - Ubuntu 16.04 ESM Summary: USN-5259-1 and USN-5259-2 introduced a regression in Cron. Software Description: - cron: process scheduling daemon Details: USN-5259-1 and USN-5259-2 fixed vulnerabilities in Cron. Unfortunately that update was incomplete and could introduce a regression. This update fixes the problem. We apologize for the inconvenience. Original advisory details: It was discovered that the postinst maintainer script in Cron unsafely handled file permissions during package install or update operations. An attacker could possibly use this issue to perform a privilege escalation attack. (CVE-2017-9525) Florian Weimer discovered that Cron incorrectly handled certain memory operations during crontab file creation. An attacker could possibly use this issue to cause a denial of service. (CVE-2019-9704) It was discovered that Cron incorrectly handled user input during crontab file creation. An attacker could possibly use this issue to cause a denial of service. (CVE-2019-9705) It was discovered that Cron contained a use-after-free vulnerability in its force_rescan_user function. An attacker could possibly use this issue to cause a denial of service. (CVE-2019-9706) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: cron 3.0pl1-128.1ubuntu1.2 Ubuntu 16.04 ESM: cron 3.0pl1-128ubuntu2+esm2 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-5259-1 https://ubuntu.com/security/notices/USN-5259-2 https://ubuntu.com/security/notices/USN-5259-3 https://launchpad.net/bugs/1971895 CVE-2017-9525 Package Information: https://launchpad.net/ubuntu/+source/cron/3.0pl1-128.1ubuntu1.2
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