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Test ID:1.3.6.1.4.1.25623.1.0.891723
Category:Debian Local Security Checks
Title:Debian LTS: Security Advisory for cron (DLA-1723-1)
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.
Description: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/OS:
cron on Debian Linux

Solution:
For Debian 8 'Jessie', these problems have been fixed in version
3.0pl1-127+deb8u2.

We recommend that you upgrade your cron packages.

CVSS Score:
6.9

CVSS Vector:
AV:L/AC:M/Au:N/C:C/I:C/A:C

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2017-9525
http://bugs.debian.org/864466
http://www.openwall.com/lists/oss-security/2017/06/08/3
https://lists.debian.org/debian-lts-announce/2019/03/msg00025.html
http://www.securitytracker.com/id/1038651
Common Vulnerability Exposure (CVE) ID: CVE-2019-9704
BugTraq ID: 107373
http://www.securityfocus.com/bid/107373
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6DU7HAUAQR4E4AEBPYLUV6FZ4PHKH6A2/
https://salsa.debian.org/debian/cron/commit/f2525567
Common Vulnerability Exposure (CVE) ID: CVE-2019-9705
BugTraq ID: 107378
http://www.securityfocus.com/bid/107378
https://salsa.debian.org/debian/cron/commit/26814a26
Common Vulnerability Exposure (CVE) ID: CVE-2019-9706
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=809167
https://packages.qa.debian.org/c/cron/news/20190311T170403Z.html
https://salsa.debian.org/debian/cron/commit/40791b93
CopyrightCopyright (C) 2019 Greenbone Networks GmbH

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