CVE-2017-9525

Name: CVE-2017-9525
Creator: NVD / NIST
Published: 2017-06-09T16:29:02.11+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.7/10EPSS 0.55%

Last modified Jun 17, 2026

CVE-2017-9525 is a medium-severity vulnerability rated 6.7/10 on the CVSS scale. 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.. EPSS estimates a 0.55% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.7/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.55%

41.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-59

Affected Software

Vendor	Product	Versions
Cron Project	Cron	<= 3.0pl1-128.
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0

References

http://bugs.debian.org/864466Issue Tracking, Third Party Advisory, Vendor Advisory
http://www.openwall.com/lists/oss-security/2017/06/08/3Mailing List, Third Party Advisory
http://www.securitytracker.com/id/1038651Third Party Advisory, VDB Entry
https://lists.debian.org/debian-lts-announce/2019/03/msg00025.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00029.htmlMailing List, Third Party Advisory
http://bugs.debian.org/864466Issue Tracking, Third Party Advisory, Vendor Advisory
http://www.openwall.com/lists/oss-security/2017/06/08/3Mailing List, Third Party Advisory
http://www.securitytracker.com/id/1038651Third Party Advisory, VDB Entry
https://lists.debian.org/debian-lts-announce/2019/03/msg00025.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00029.htmlMailing List, Third Party Advisory

Timeline

Published: Jun 9, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-9525?

How severe is CVE-2017-9525?

CVE-2017-9525 has a CVSS score of 6.7/10 (MEDIUM severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.

How do I fix CVE-2017-9525?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-9525?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST