CIFS signing sec= mount options don't work correctly
Published Aug 9, 2007
4.3
MEDIUMCVSS 2.0
EPSS 2.62%
Description
The Linux kernel before 2.6.23-rc1 checks the wrong global variable for the CIFS sec mount option, which might allow remote attackers to spoof CIFS network traffic that the client configured for security signatures, as demonstrated by lack of signing despite sec=ntlmv2i in a SetupAndX request.
Affected products
No data.
- ≤ 2.6.22
No data.
Red Hat Enterprise Linux 4
kernel-0:2.6.9-55.0.12.EL
Fixed · RHSA-2007:0939
Red Hat Enterprise Linux 5
kernel-0:2.6.18-8.1.10.el5
Fixed · RHSA-2007:0705
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | kernel-0:2.6.9-55.0.12.EL | Fixed | RHSA-2007:0939 |
| Red Hat Enterprise Linux 5 | kernel-0:2.6.18-8.1.10.el5 | Fixed | RHSA-2007:0705 |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 2.1 or 3.
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:N/AC:M/Au:N/C:N/I:P/A:N
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 (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.62% (0.02624) | 84.94th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.62% (0.02624) | 83.44th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.78% (0.01780) | 81.47th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.27% (0.01267) | 86.24th | v3 (v2023.03.01) |
| Jul 20, 2024 | 2.02% (0.02022) | 89.07th | v3 (v2023.03.01) |
| Jun 12, 2024 | 1.23% (0.01229) | 85.41th | v3 (v2023.03.01) |
| May 5, 2024 | 0.91% (0.00907) | 82.67th | v3 (v2023.03.01) |
| Mar 28, 2024 | 0.92% (0.00916) | 82.50th | v3 (v2023.03.01) |
| Jan 11, 2024 | 0.87% (0.00870) | 80.57th | v3 (v2023.03.01) |
| Dec 4, 2023 | 0.85% (0.00850) | 80.21th | v3 (v2023.03.01) |
| Aug 15, 2023 | 0.81% (0.00809) | 79.57th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.75% (0.00747) | 78.02th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.78% (0.03779) | 85.48th | v2 (v2022.01.01) |
| Feb 13, 2023 | 3.78% (0.03779) | 85.08th | v2 (v2022.01.01) |
| Feb 3, 2023 | 4.36% (0.04358) | 87.66th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.78% (0.03779) | 84.01th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.78% (0.03779) | 67.21th | v2 (v2022.01.01) |
No CWE recorded.
References (22)
- http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=246595 x_refsource_CONFIRM
- http://kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.23-rc1 x_refsource_CONFIRM
- http://lists.opensuse.org/opensuse-security-announce/2007-12/msg00001.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2008-02/msg00002.html vendor-advisoryx_refsource_SUSE
- http://secunia.com/advisories/26366 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/26647 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/26760 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/27436 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/27747 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/27912 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/28806 third-party-advisoryx_refsource_SECUNIA
- http://support.avaya.com/elmodocs2/security/ASA-2007-474.htm x_refsource_CONFIRM
- http://www.debian.org/security/2007/dsa-1363 vendor-advisoryx_refsource_DEBIAN
- http://www.redhat.com/support/errata/RHSA-2007-0705.html vendor-advisoryx_refsource_REDHAT
- http://www.redhat.com/support/errata/RHSA-2007-0939.html vendor-advisoryx_refsource_REDHAT
- http://www.securityfocus.com/bid/25244 vdb-entryx_refsource_BID
- http://www.ubuntu.com/usn/usn-510-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2007-3843 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=275901 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2007-3843
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9670 vdb-entrysignaturex_refsource_OVAL
- https://www.cve.org/CVERecord?id=CVE-2007-3843
Change history (0)
No recorded changes yet.