fuse: incorrect filtering of environment variables leading to privilege escalation
Published Jul 2, 2015
3.6
LOWCVSS 2.0
EPSS 1.00%
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.
Affected products
No data.
Configuration 1
- 8.0
Configuration 2
- ≤ 2.9.2
No data.
Red Hat Enterprise Linux 5
fuse
Will not fix
Red Hat Enterprise Linux 6
fuse
Will not fix
Red Hat Enterprise Linux 7
fuse
Will not fix
Red Hat Enterprise Linux 7
libguestfs-winsupport
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | fuse | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | fuse | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | fuse | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | libguestfs-winsupport | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:L/AC:L/Au:N/C:N/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (8 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.00% (0.01004) | 61.62th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.01% (0.01008) | 58.38th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.20% (0.00203) | 40.42th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 0.34th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 0.50th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.53% (0.03534) | 84.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.53% (0.03534) | 83.33th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.53% (0.03534) | 66.49th | v2 (v2022.01.01) |
References (26)
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159298.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159543.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159683.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159831.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/160094.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2015-June/160106.html vendor-advisoryx_refsource_FEDORA
- http://lists.opensuse.org/opensuse-updates/2015-06/msg00005.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-updates/2015-06/msg00007.html vendor-advisoryx_refsource_SUSE
- http://packetstormsecurity.com/files/132021/Fuse-Local-Privilege-Escalation.html x_refsource_MISC
- http://www.debian.org/security/2015/dsa-3266 vendor-advisoryx_refsource_DEBIAN
- http://www.debian.org/security/2015/dsa-3268 vendor-advisoryx_refsource_DEBIAN
- http://www.openwall.com/lists/oss-security/2015/05/21/9 mailing-listx_refsource_MLISTExploit
- http://www.securityfocus.com/bid/74765 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1032386 vdb-entryx_refsource_SECTRACK
- http://www.ubuntu.com/usn/USN-2617-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-2617-2 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-2617-3 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2015-3202 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1224103 Issue Tracking
- https://gist.github.com/taviso/ecb70eb12d461dd85cba x_refsource_MISCExploit
- https://nvd.nist.gov/vuln/detail/CVE-2015-3202
- https://security.gentoo.org/glsa/201603-04 vendor-advisoryx_refsource_GENTOO
- https://security.gentoo.org/glsa/201701-19 vendor-advisoryx_refsource_GENTOO
- https://twitter.com/taviso/status/601370527437967360 x_refsource_MISC
- https://www.cve.org/CVERecord?id=CVE-2015-3202
- https://www.exploit-db.com/exploits/37089/ exploitx_refsource_EXPLOIT-DB
Change history (0)
No recorded changes yet.