USN-5259-1

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USN-5259-1

Summary: cron vulnerabilities

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)

References: https://ubuntu.com/security/notices/USN-5259-1, https://ubuntu.com/security/CVE-2017-9525, https://ubuntu.com/security/CVE-2019-9704, https://ubuntu.com/security/CVE-2019-9705, https://ubuntu.com/security/CVE-2019-9706