Potential SpEL Injection In Spring Framework — Sigma Rule

Rule metadata and linked tags

Author: Moti Harmats. Source status: test; severity: high. Source dates: 2023-02-11 / not supplied.

{
  "category": "application",
  "product": "spring",
  "definition": "Requirements: application error logs must be collected (with LOG_LEVEL=ERROR and above)"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: d668b3c89542aba93d58551aa9cc6f5f786210bf17e0904b9e4a9e504980dbee

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Potential SpEL Injection In Spring Framework
id: e9edd087-89d8-48c9-b0b4-5b9bb10896b8
status: test
description: Detects potential SpEL Injection exploitation, which may lead to RCE.
references:
    - https://owasp.org/www-community/vulnerabilities/Expression_Language_Injection
    - https://www.wix.engineering/post/threat-and-vulnerability-hunting-with-application-server-error-logs
author: Moti Harmats
date: 2023-02-11
tags:
    - attack.initial-access
    - attack.t1190
logsource:
    category: application
    product: spring
    definition: 'Requirements: application error logs must be collected (with LOG_LEVEL=ERROR and above)'
detection:
    keywords:
        - 'org.springframework.expression.ExpressionException'
    condition: keywords
falsepositives:
    - Application bugs
level: high

Original YAML and metadata in JSON

False positives

• Application bugs

Source references

• https://owasp.org/www-community/vulnerabilities/Expression_Language_Injection
• https://www.wix.engineering/post/threat-and-vulnerability-hunting-with-application-server-error-logs