CVE-2017-9525

Severity: medium (CVSS 6.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-06-09 · updated 2026-06-17
Weakness: CWE-59

Description

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.

Affected products

Cron Project Cron: through 3.0pl1-128.
Debian Linux: 8.0, 9.0

References

http://bugs.debian.org/864466
http://www.openwall.com/lists/oss-security/2017/06/08/3
http://www.securitytracker.com/id/1038651
https://lists.debian.org/debian-lts-announce/2019/03/msg00025.html
https://lists.debian.org/debian-lts-announce/2021/10/msg00029.html
http://bugs.debian.org/864466
http://www.openwall.com/lists/oss-security/2017/06/08/3
http://www.securitytracker.com/id/1038651
https://lists.debian.org/debian-lts-announce/2019/03/msg00025.html
https://lists.debian.org/debian-lts-announce/2021/10/msg00029.html

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