Ubuntu alert USN-5259-1 (cron)

From:
             
 
Camila Camargo de Matos <camila.camargodematos@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-5259-1] Cron vulnerabilities
Date:
             
 
Tue, 01 Feb 2022 12:07:02 -0300
Message-ID:
             
 
<fbe4cc8d-8941-5510-b336-6998dbe9d20f@canonical.com>
==========================================================================
Ubuntu Security Notice USN-5259-1
February 01, 2022

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

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

- Ubuntu 16.04 ESM

Summary:

Several security issues were fixed in Cron.

Software Description:
- cron: process scheduling daemon

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 16.04 ESM:
cron 3.0pl1-128ubuntu2+esm1

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

References:
https://ubuntu.com/security/notices/USN-5259-1
CVE-2017-9525, CVE-2019-9704, CVE-2019-9705, CVE-2019-9706
-- 
ubuntu-security-announce mailing list
ubuntu-security-announce@lists.ubuntu.com
Modify settings or unsubscribe at:
https://lists.ubuntu.com/mailman/listinfo/ubuntu-security...