openssh: Bounds check can be evaded in the shared memory manager used by pre-authentication compression support
Published Jan 5, 2017
7.8
HIGHCVSS 3.1
EPSS 1.28%
Description
The shared memory manager (associated with pre-authentication compression) in sshd in OpenSSH before 7.4 does not ensure that a bounds check is enforced by all compilers, which might allows local users to gain privileges by leveraging access to a sandboxed privilege-separation process, related to the m_zback and m_zlib data structures.
Affected products
No data.
No data.
Red Hat Enterprise Linux 7
openssh-0:7.4p1-11.el7
Fixed · RHSA-2017:2029
Red Hat Enterprise Linux 4
openssh
Will not fix
Red Hat Enterprise Linux 5
openssh
Will not fix
Red Hat Enterprise Linux 6
openssh
Fix deferred
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | openssh-0:7.4p1-11.el7 | Fixed | RHSA-2017:2029 |
| Red Hat Enterprise Linux 4 | openssh | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | openssh | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | openssh | Fix deferred | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
In order to exploit this flaw, the attacker needs to first compromise the sandboxed privilege-separation process by using another security flaw. Because of this restriction for successful exploitation, this issue has been rated as having Low security impact.
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:H/A:H
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
AV:L/AC:L/Au:N/C:C/I:C/A:C
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Jan 30, 2024 · 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 | 1.28% (0.01281) | 68.97th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.28% (0.01281) | 66.15th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.02% (0.00016) | 1.96th | 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 | 1.28% (0.01282) | 68.34th | v2 (v2022.01.01) |
| Feb 22, 2023 | 1.28% (0.01282) | 68.05th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.28% (0.01282) | 65.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.28% (0.01282) | 41.72th | v2 (v2022.01.01) |
References (16)
- http://www.openwall.com/lists/oss-security/2016/12/19/2 mailing-listMailing ListRelease Notes
- http://www.securityfocus.com/bid/94975 vdb-entry
- http://www.securitytracker.com/id/1037490 vdb-entry
- http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.647637
- https://access.redhat.com/errata/RHSA-2017:2029 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2016-10012 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1406293 Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://github.com/openbsd/src/commit/3095060f479b86288e31c79ecbc5131a66bcd2f9 PatchVendor Advisory
- https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html mailing-list
- https://nvd.nist.gov/vuln/detail/CVE-2016-10012
- https://security.netapp.com/advisory/ntap-20171130-0002/
- https://support.f5.com/csp/article/K62201745?utm_source=f5support&%3Butm_medium=RSS
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03818en_us
- https://www.cve.org/CVERecord?id=CVE-2016-10012
- https://www.openssh.com/txt/release-7.4
Change history (0)
No recorded changes yet.