CVE-2017-9525 json
In the cron package through 3.0pl1-128 on Debian, and through 3.0pl1-128ubuntu2 on Ubuntu, the postinst maintainer script allows for group-…
published 2017-06-09 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-18456
- cvss
- 6.7
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 46%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- cron Debian 14, Debian 13, Debian 12 3.0pl1-129
- systemd-cron Debian 14, Debian 13, Debian 12 1.5.17-2
debian advisories DEBIAN-CVE-2017-9525
- cron Ubuntu 18.04 LTS 3.0pl1-128.1ubuntu1.2
- cron Ubuntu Pro 16.04 LTS 3.0pl1-128ubuntu2+esm2
ubuntu advisories UBUNTU-CVE-2017-9525
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
Exploit prediction
0.55% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.7 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.9 | AV:L/AC:M/Au:N/C:C/I:C/A:C |
Classification
- Weakness
-
- CWE-59 Improper Link Resolution Before File Access
References
-
bugs.debian.org
/864466
issue-tracking, third-party-advisory, vendor-advisory
-
openwall.com
/lists/oss-security/2017/06/08/3
mailing-list, third-party-advisory
-
securitytracker.com
/id/1038651
vdb-entry, third-party-advisory
-
lists.debian.org
/debian-lts-announce/2019/03/msg00025.html
mailing-list, third-party-advisory
-
lists.debian.org
/debian-lts-announce/2021/10/msg00029.html
mailing-list, third-party-advisory
Sources
- CVE List CVE-2017-9525
- NVD CVE-2017-9525
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.