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Ubuntu Security Notice USN-5259-3

Ubuntu Security Notice USN-5259-3
Posted May 11, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5259-3 - USN-5259-1 and USN-5259-2 fixed vulnerabilities in Cron. Unfortunately that update was incomplete and could introduce a regression. This update fixes the problem. 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. 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. 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. 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.

tags | advisory, denial of service, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-9525, CVE-2019-9704, CVE-2019-9705, CVE-2019-9706
SHA-256 | 2c9318e69fe86c3b063c4d4569574e3f0fdc2dd430d0ba5c56dd3604970268db

Ubuntu Security Notice USN-5259-3

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5259-3
May 11, 2022

cron regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM

Summary:

USN-5259-1 and USN-5259-2 introduced a regression in Cron.

Software Description:
- cron: process scheduling daemon

Details:

USN-5259-1 and USN-5259-2 fixed vulnerabilities in Cron. Unfortunately
that update was incomplete and could introduce a regression. This update
fixes the problem.

We apologize for the inconvenience.

Original advisory 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)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
cron 3.0pl1-128.1ubuntu1.2

Ubuntu 16.04 ESM:
cron 3.0pl1-128ubuntu2+esm2

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-5259-1
https://ubuntu.com/security/notices/USN-5259-2
https://ubuntu.com/security/notices/USN-5259-3
https://launchpad.net/bugs/1971895
CVE-2017-9525

Package Information:
https://launchpad.net/ubuntu/+source/cron/3.0pl1-128.1ubuntu1.2
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