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Ubuntu Security Notice USN-5259-2

Ubuntu Security Notice USN-5259-2
Posted May 6, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5259-2 - USN-5259-1 fixed several vulnerabilities in Cron. This update provides the corresponding update for Ubuntu 18.04 LTS. 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.

tags | advisory, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-9525, CVE-2019-9704, CVE-2019-9705, CVE-2019-9706
SHA-256 | f30ea8403ff709ad2f12933000ca06902fbc99d9ae7d782f9e0037b905f42e5f

Ubuntu Security Notice USN-5259-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5259-2
May 06, 2022

cron vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Cron.

Software Description:
- cron: process scheduling daemon

Details:

USN-5259-1 fixed several vulnerabilities in Cron. This update provides
the corresponding update for Ubuntu 18.04 LTS.

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 3.0pl1-128.1ubuntu1.1

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

References:
https://ubuntu.com/security/notices/USN-5259-2
https://ubuntu.com/security/notices/USN-5259-1
CVE-2017-9525, CVE-2019-9704, CVE-2019-9705, CVE-2019-9706

Package Information:
https://launchpad.net/ubuntu/+source/cron/3.0pl1-128.1ubuntu1.1

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