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Debian LTS: Security Advisory for cron (DLA-2801-1)

Information

Severity

Severity

Medium

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

6.9

CVSSv2 Vector

CVSSv2 Vector

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

Solution Type

Solution Type

Vendor Patch

Created

Created

2 years ago

Modified

Modified

2 years ago

Summary

The remote host is missing an update for the 'cron' package(s) announced via the DLA-2801-1 advisory.

Insight

Insight

CVE-2017-9525 Fix group crontab to root escalation via postinst. CVE-2019-9704 A very large crontab created by a user could crash the daemon. CVE-2019-9705 Enforce maximum crontab line count of 10000 to prevent a malicious user from creating an excessivly large crontab. CVE-2019-9706 Fix for possible DoS by use-after-free. Additionally, a bypass of /etc/cron.{allow, deny} on failure to open has been fixed. If these files exist, then they must be readable by the user executing crontab(1). Users will now be denied by default if they aren't.

Affected Software

Affected Software

'cron' package(s) on Debian Linux.

Detection Method

Detection Method

Checks if a vulnerable package version is present on the target host.

Solution

Solution

For Debian 9 stretch, these problems have been fixed in version 3.0pl1-128+deb9u2. We recommend that you upgrade your cron packages.

Common Vulnerabilities and Exposures (CVE)