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Ubuntu 16.04 USN-5259-1 Critical: Cron Privilege Escalation & DoS

ubuntu
Calendar Grey February 1, 2022
Dist Ubuntu Esm H88
Ubuntu Security Announcement USN-5260-1 addresses significant vulnerabilities in OpenSSL impacting Ubuntu 18.04 LTS. Immediate upgrade advised.
Several security issues were fixed in Cron.

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)

Topics%20covered

Topics Covered

security advisory denial of service critical issue privilege escalation ubuntu cron

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

CVE-2017-9525, CVE-2019-9704, CVE-2019-9705, CVE-2019-9706

Severity
critical
Lowest
Low
Medium
High
Critical

February 01, 2022

Topics%20covered

Topics Covered

security advisory denial of service critical issue privilege escalation ubuntu cron

Package Information

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