Ubuntu Security Notice USN-5259-1 ≈ Packet Storm

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Ubuntu Security Notice USN-5259-1^[6]: Authored by Ubuntu ^[7] | Site security.ubuntu.com ^[8]; Ubuntu Security Notice 5259-1 - 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.; systems | linux ^[9], ubuntu ^[10]; advisories | CVE-2017-9525 ^[11], CVE-2019-9704 ^[12], CVE-2019-9705 ^[13], CVE-2019-9706 ^[14]; MD5 | af950739e60267b500aa26f7a50adb73; Download ^[15] | Favorite ^[16] | View ^[17]

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Ubuntu Security Notice USN-5259-1
February 01, 2022
cron vulnerabilities
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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