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Debian LTS Advisory ([SECURITY] [DLA 1723-1] cron security update)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
Various security problems have been discovered in Debian's CRON scheduler. CVE-2017-9525 Fix group crontab to root escalation via the Debian package's postinst script as described by Alexander Peslyak (Solar Designer) in the linked references. CVE-2019-9704 DoS: Fix unchecked return of calloc(). Florian Weimer discovered that a missing check for the return value of calloc() could crash the daemon, which could be triggered by a very large crontab created by a user. CVE-2019-9705 Enforce maximum crontab line count of 1000 to prevent a malicious user from creating an excessivly large crontab. The daemon will log a warning for existing files, and crontab(1) will refuse to create new ones. CVE-2019-9706 A user reported a use-after-free condition in the cron daemon, leading to a possible Denial-of-Service scenario by crashing the daemon.
Affected Software
Affected Software
cron on Debian Linux
Detection Method
Detection Method
This check tests the installed software version using the apt package manager.
Solution
Solution
For Debian 8 'Jessie', these problems have been fixed in version 3.0pl1-127+deb8u2. We recommend that you upgrade your cron packages.