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CVE-2017-9525

Status Candidate

Overview

In the cron package through 3.0pl1-128 on Debian, and through 3.0pl1-128ubuntu2 on Ubuntu, the postinst maintainer script allows for group-crontab-to-root privilege escalation via symlink attacks against unsafe usage of the chown and chmod programs.

Related Files

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-5259-2
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-5259-1
Posted Feb 1, 2022
Authored by Ubuntu | Site security.ubuntu.com

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.

tags | advisory, denial of service
systems | linux, ubuntu
advisories | CVE-2017-9525, CVE-2019-9704, CVE-2019-9705, CVE-2019-9706
SHA-256 | 7708b42ed0cb12cf75a820c930eeee446f370eea62c1f51b9719302793412a84
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