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Detection rules › Sigma

Exploitation of CVE-2021-26814 in Wazuh

Status
test
Severity
high
Log source
category webserver
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects the exploitation of the Wazuh RCE vulnerability described in CVE-2021-26814

MITRE ATT&CK coverage

TacticTechniques
Initial AccessT1190 Exploit Public-Facing Application

Rule body yaml

title: Exploitation of CVE-2021-26814 in Wazuh
id: b9888738-29ed-4c54-96a4-f38c57b84bb3
status: test
description: Detects the exploitation of the Wazuh RCE vulnerability described in CVE-2021-26814
references:
    - https://github.com/WickdDavid/CVE-2021-26814/blob/6a17355a10ec4db771d0f112cbe031e418d829d5/PoC.py
author: Florian Roth (Nextron Systems)
date: 2021-05-22
modified: 2023-01-02
tags:
    - attack.initial-access
    - attack.t1190
    - cve.2021-21978
    - cve.2021-26814
    - detection.emerging-threats
logsource:
    category: webserver
detection:
    selection:
        cs-uri-query|contains: '/manager/files?path=etc/lists/../../../../..'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    cs-uri-query|contains: '/manager/files?path=etc/lists/../../../../..'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
cs-uri-querymatch
  • /manager/files?path=etc/lists/../../../../..