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Emc Data Domain OsOperating system · Dell

CVE-2016-0911

HIGH · 8.2 CVSS v3.0 Published 2016-06-19
Fix available
A fix is available. Upgrade to after 5.7.1.0 or later.
See remediation →
84/100
Remediation priority · High
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
EMC Data Domain OS 5.4 through 5.7 before 5.7.2.0 has a default no_root_squash option for NFS exports, which makes it easier for remote attackers to obtain filesystem access by leveraging client root privileges.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

EMC Data Domain OS versions 5.4 through 5.7 before 5.7.2.0 ships with a default NFS export configuration that includes the no_root_squash option. This allows remote clients connecting via NFS to retain root privileges when accessing exported filesystems, enabling attackers with root access on NFS client machines to obtain privileged filesystem access on the Data Domain system.

MitigationModify NFS export configurations to remove the no_root_squash option, replacing it with root_squash to map remote root users to unprivileged accounts, or restrict NFS exports to specific trusted IP addresses.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Emc Data Domain OsOperating system
Affected:<= 5.7.1.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check Data Domain OS version
    Run 'ddboost show version' or access the system management interface to view the OS version
    Affected if Version is 5.4.x, 5.5.x, 5.6.x, or 5.7.0-5.7.1.0 (any version from 5.4 through 5.7.1.0)
  2. Verify NFS export is configured
    Run 'nfs export list' or check the NFS export configuration on the Data Domain system to see if any NFS exports exist
    Affected if NFS exports are configured and active on the system
  3. Inspect NFS export configuration for no_root_squash
    Run 'nfs export show' for each export, or examine the NFS export configuration files to identify whether the 'no_root_squash' option is present in any export entry
    Affected if The no_root_squash option is enabled in any NFS export configuration

A system is affected if it runs Data Domain OS version 5.4 through 5.7.1.0, has NFS exports configured, and includes the no_root_squash option, allowing remote root users to retain privileged access on exported filesystems.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Upgrade available Upgrade to a release after 5.7.1.0
Interim mitigation

Modify NFS export configurations to remove the no_root_squash option, replacing it with root_squash to map remote root users to unprivileged accounts, or restrict NFS exports to specific trusted IP addresses.

Fix this in Emc Data Domain Os Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2016-0911 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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