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LogstashApplication · Elastic

CVE-2014-4326

HIGH · 7.5 CVSS v2.0 Published 2014-07-22
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges 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
Elasticsearch Logstash 1.0.14 through 1.4.x before 1.4.2 allows remote attackers to execute arbitrary commands via a crafted event in (1) zabbix.rb or (2) nagios_nsca.rb in outputs/.

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 · high confidence

Elasticsearch Logstash versions 1.0.14 through 1.4.x before 1.4.2 contains a command injection vulnerability in the zabbix.rb and nagios_nsca.rb output plugins. Remote attackers can execute arbitrary OS commands by sending specially crafted events to these plugins, which improperly sanitize input before passing it to system shell commands.

MitigationUpgrade Logstash to version 1.4.2 or later to obtain the patched code that properly sanitizes event data before passing it to external monitoring system commands.

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
LogstashApplication
Affected:= 1.0.14= 1.0.15= 1.0.16= 1.0.17= 1.1.0= 1.1.0.1= 1.1.1= 1.1.2= 1.1.3= 1.1.4= 1.1.5= 1.1.6

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
Network
Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:L/Au:N/C:P/I:P/A:P

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 Logstash version
    Run `logstash --version` or identify the logstash jar file in the installation directory
    Affected if The installed version is 1.0.14 through 1.4.1 (inclusive), or falls between 1.0.14 and 1.4.2 without reaching 1.4.2
  2. Identify zabbix.rb plugin usage
    Search for zabbix output configuration in Logstash conf files or grep for 'zabbix' in the pipeline configuration
    Affected if A zabbix output plugin is configured and enabled in the Logstash pipeline
  3. Identify nagios_nsca.rb plugin usage
    Search for nagios_nsca output configuration in Logstash conf files or grep for 'nagios_nsca' in the pipeline configuration
    Affected if A nagios_nsca output plugin is configured and enabled in the Logstash pipeline

If Logstash version is between 1.0.14 and 1.4.1 inclusive AND either the zabbix or nagios_nsca output plugin is actively used in the configuration, the environment is vulnerable to command injection.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade Logstash to version 1.4.2 or later to obtain the patched code that properly sanitizes event data before passing it to external monitoring system commands.

Fix this in Logstash Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,280
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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-2014-4326 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
  • No weaponised exploit code, or anything meant to cause harm
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