CVE-2017-9525: cron_project cron Link Following
CVSS: 6.9v2.0MediumModified
AliasesUBUNTU-CVE-2017-9525USN-5259-3DEBIAN-CVE-2017-9525
Published 09-06-2017Last modified 05-08-2024
Vulnerability summary
CVE-2017-9525 is a medium (CVSS 6.9) Link Following vulnerability in cron_project cron. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 44.8% of scored vulnerabilities.
CVSS score
6.9/10
010
Medium · v2.0 (NVD)EPSS score
0.55%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 4 · Related 2Timeline
- 09-06-2017PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versionsMedium 6.7Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated6.7MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated6.7MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Medium 6.9Preferred score · NVD (NIST)
AV:L/AC:M/Au:N/C:C/I:C/A:CSourcesSingle source
EPSS trend
Probability
0.55%
Chance of exploitation in the next 30 days
Percentile
45%
Versus all other CVEs
30-day change
0.00 pp
From 0.55% on 18-09-2026
18-09-202618-10-2026
EPSS score0.55%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian3 products
- cron< 3.0pl1-129
- systemd-cron< 1.5.17-2
- debian_linuxEOL8.0 | 9.0
Cron_project1 product
- cron≤ 3.0pl1-128.
Ubuntu1 product
- cronAll versions (No fix recorded) | < 3.0pl1-128ubuntu2+esm2 | < 3.0pl1-128.1ubuntu1.2
3 vendors · 5 products
References
12 links
- www.openwall.com/lists/oss-security/2017/06/08/3X Refsource MISCMailing ListThird Party AdvisoryREPORT
- lists.debian.org/debian-lts-announce/2019/03/msg00025.htmlMailing ListX Refsource MLISTThird Party Advisory
- lists.debian.org/debian-lts-announce/2021/10/msg00029.htmlMailing ListX Refsource MLISTThird Party Advisory