Vulnerability Details : CVE-2017-9525
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.
Vulnerability category: Gain privilege
Products affected by CVE-2017-9525
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:a:cron_project:cron:*:*:*:*:*:*:*:*When used together with: Canonical » Ubuntu LinuxWhen used together with: Debian » Debian Linux
Exploit prediction scoring system (EPSS) score for CVE-2017-9525
0.06%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 25 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-9525
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.9
|
MEDIUM | AV:L/AC:M/Au:N/C:C/I:C/A:C |
3.4
|
10.0
|
NIST | |
|
6.7
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
0.8
|
5.9
|
NIST |
CWE ids for CVE-2017-9525
-
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.Assigned by: nvd@nist.gov (Primary)
References for CVE-2017-9525
-
http://bugs.debian.org/864466
#864466 - cron: CVE-2017-9525: group crontab to root escalation via postinst - Debian Bug report logsIssue Tracking;Third Party Advisory;Vendor Advisory
-
https://lists.debian.org/debian-lts-announce/2019/03/msg00025.html
[SECURITY] [DLA 1723-1] cron security updateMailing List;Third Party Advisory
-
http://www.securitytracker.com/id/1038651
Debian/Ubuntu Cron Symlink Validation Flaw Lets Local Users Bypass Security Restrictions - SecurityTrackerThird Party Advisory;VDB Entry
-
http://www.openwall.com/lists/oss-security/2017/06/08/3
oss-security - Vixie/ISC Cron group crontab to root escalationMailing List;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2021/10/msg00029.html
[SECURITY] [DLA 2801-1] cron security updateMailing List;Third Party Advisory
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