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Potential Server Side Template Injection In Velocity

Status
test
Severity
high
Log source
category application, product velocity
Author
Moti Harmats
Source
github.com/SigmaHQ/sigma

Detects exceptions in velocity template renderer, this most likely happens due to dynamic rendering of user input and may lead to RCE.

Known false positives

  • Application bugs
  • Missing .vm files

MITRE ATT&CK coverage

TacticTechniques
Initial Access

Rule body

title: Potential Server Side Template Injection In Velocity
id: 16c86189-b556-4ee8-b4c7-7e350a195a4f
status: test
description: Detects exceptions in velocity template renderer, this most likely happens due to dynamic rendering of user input and may lead to RCE.
references:
    - https://antgarsil.github.io/posts/velocity/
    - 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: velocity
    definition: 'Requirements: application error logs must be collected (with LOG_LEVEL=ERROR and above)'
detection:
    keywords:
        - 'ParseErrorException'
        - 'VelocityException'
        - 'TemplateInitException'
    condition: keywords
falsepositives:
    - Application bugs
    - Missing .vm files
level: high

Stages and Predicates

Stage 0: condition

keywords

Stage 1: keywords

keywords:
    - 'ParseErrorException'
    - 'VelocityException'
    - 'TemplateInitException'