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[SECURITY] [DLA 1723-1] cron security update

Package        : cron
Version        : 3.0pl1-127+deb8u2
CVE ID         : CVE-2017-9525 CVE-2019-9704 CVE-2019-9705 CVE-2019-9706
Debian Bug     : 809167

Various security problems have been discovered in Debian's CRON scheduler.


    Fix group crontab to root escalation via the Debian package's
    postinst script as described by Alexander Peslyak (Solar Designer) in


    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


    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


    A user reported a use-after-free condition in the cron daemon,
    leading to a possible Denial-of-Service scenario by crashing the

For Debian 8 "Jessie", these problems have been fixed in version

We recommend that you upgrade your cron packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


mike gabriel aka sunweaver (Debian Developer)
fon: +49 (1520) 1976 148

GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22  0782 9AF4 6B30 2577 1B31
mail: sunweaver@debian.org, http://sunweavers.net

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