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Detection rules › Sigma

Sitecore Pre-Auth RCE CVE-2021-42237

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

Detects exploitation attempts of Sitecore Experience Platform Pre-Auth RCE CVE-2021-42237 found in Report.ashx

Known false positives

  • Vulnerability Scanning

MITRE ATT&CK coverage

TacticTechniques
Initial Access

Rule body

title: Sitecore Pre-Auth RCE CVE-2021-42237
id: 20c6ed1c-f7f0-4ea3-aa65-4f198e6acb0f
status: test
description: Detects exploitation attempts of Sitecore Experience Platform Pre-Auth RCE CVE-2021-42237 found in Report.ashx
references:
    - https://blog.assetnote.io/2021/11/02/sitecore-rce/
    - https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB1000776
author: Florian Roth (Nextron Systems)
date: 2021-11-17
modified: 2023-01-02
tags:
    - attack.initial-access
    - attack.t1190
    - cve.2021-42237
    - detection.emerging-threats
logsource:
    category: webserver
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: '/sitecore/shell/ClientBin/Reporting/Report.ashx'
        sc-status: 200
    condition: selection
falsepositives:
    - Vulnerability Scanning
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    cs-method: 'POST'
    cs-uri-query|contains: '/sitecore/shell/ClientBin/Reporting/Report.ashx'
    sc-status: 200

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
cs-methodeq
  • POST
field:"cs-method" kind:eq value:"POST"
cs-uri-querymatch
  • /sitecore/shell/ClientBin/Reporting/Report.ashx
field:"cs-uri-query" kind:match value:"/sitecore/shell/ClientBin/Reporting/Report.ashx"
sc-statuseq
  • 200
field:"sc-status" kind:eq value:"200"