openssh: Unauthorized local access to host keys on platforms where ssh-rand-helper used
Published Feb 3, 2014
5.5
MEDIUMCVSS 3.1
EPSS 0.42%
Description
ssh-keysign.c in ssh-keysign in OpenSSH before 5.8p2 on certain platforms executes ssh-rand-helper with unintended open file descriptors, which allows local users to obtain sensitive key information via the ptrace system call.
Affected products
No data.
- ≤ 5.8
- 1.2
- 1.2.1
- 1.2.2
- 1.2.3
- 1.2.27
- 1.3
- 1.5
- 1.5.7
- 1.5.8
- 2
- 2.1
- 2.1.1
- 2.2
- 2.3
- 2.3.1
- 2.5
- 2.5.1
- 2.5.2
- 2.9
- 2.9.9
- 2.9.9p2
- 2.9p1
- 2.9p2
- 3.0
- 3.0.1
- 3.0.1p1
- 3.0.2
- 3.0.2p1
- 3.0p1
- 3.1
- 3.1p1
- 3.2
- 3.2.2
- 3.2.2p1
- 3.2.3p1
- 3.3
- 3.3p1
- 3.4
- 3.4p1
- 3.5
- 3.5p1
- 3.6
- 3.6.1
- 3.6.1p1
- 3.6.1p2
- 3.7
- 3.7.1
- 3.7.1p1
- 3.7.1p2
- 3.8
- 3.8.1
- 3.8.1p1
- 3.9
- 3.9.1
- 3.9.1p1
- 4.0
- 4.0p1
- 4.1
- 4.1p1
- 4.2
- 4.2p1
- 4.3
- 4.3p1
- 4.3p2
- 4.4
- 4.4p1
- 4.5
- 4.6
- 4.7
- 4.8
- 4.9
- 5.0
- 5.1
- 5.2
- 5.3
- 5.4
- 5.5
- 5.6
- 5.7
No data.
Red Hat Enterprise Linux 4
openssh
Not affected
Red Hat Enterprise Linux 5
openssh
Not affected
Red Hat Enterprise Linux 6
openssh
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | openssh | Not affected | n/a |
| Red Hat Enterprise Linux 5 | openssh | Not affected | n/a |
| Red Hat Enterprise Linux 6 | openssh | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of openssh as shipped with Red Hat Enterprise Linux 4, 5, and 6, as they use a built-in entropy pool to generate and retrieve entropy information when performing host-based authentication.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
No CVSS v3.0 score for this CVE.
AV:L/AC:L/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed May 29, 2026 · SSVC 2.0.3
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 (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.42% (0.00416) | 33.54th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.42% (0.00416) | 32.99th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.07% (0.00071) | 19.16th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.89% (0.00885) | 26.24th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
References (5)
- http://www.openssh.com/txt/portable-keysign-rand-helper.adv x_refsource_CONFIRMVendor Advisory
- https://access.redhat.com/security/cve/CVE-2011-4327 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=755640 x_refsource_CONFIRMIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2011-4327
- https://www.cve.org/CVERecord?id=CVE-2011-4327
| Link | Providers | Tags |
|---|---|---|
| http://www.openssh.com/txt/portable-keysign-rand-helper.adv | x_refsource_CONFIRMVendor Advisory | |
| https://access.redhat.com/security/cve/CVE-2011-4327 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=755640 | x_refsource_CONFIRMIssue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-4327 | ||
| https://www.cve.org/CVERecord?id=CVE-2011-4327 |
Change history (0)
No recorded changes yet.