posh - Privilege Escalation

ID: privesc-posh

Severity: high

Author: daffainfo

Tags: code,linux,posh,privesc,local

Description

“posh” typically refers to the “Policy-compliant Ordinary SHell,” which is a restricted shell designed to provide a limited set of commands and features for users with restricted access. It is often used in environments where users require limited functionality and access to system resources.

YAML Source

id: privesc-posh

info:
  name: posh - Privilege Escalation
  author: daffainfo
  severity: high
  description: |
    "posh" typically refers to the "Policy-compliant Ordinary SHell," which is a restricted shell designed to provide a limited set of commands and features for users with restricted access. It is often used in environments where users require limited functionality and access to system resources.
  reference:
    - https://gtfobins.github.io/gtfobins/posh/
  metadata:
    verified: true
    max-request: 3
  tags: code,linux,posh,privesc,local

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      whoami

  - engine:
      - sh
      - bash
    source: |
      posh -c 'whoami'

  - engine:
      - sh
      - bash
    source: |
      sudo posh -c 'whoami'

    matchers-condition: and
    matchers:
      - type: word
        part: code_1_response
        words:
          - "root"
        negative: true

      - type: dsl
        dsl:
          - 'contains(code_2_response, "root")'
          - 'contains(code_3_response, "root")'
        condition: or
# digest: 4a0a00473045022053dcbba4e8bc519b14494fa52bb34baa730307a45385ecee29a10a964332a8600221009fe4b7f7f371976cf914c7a294ec410e21a51d0191fd8ff5e225061020e8165a:922c64590222798bb761d5b6d8e72950

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.

$ nuclei -u "URL" -t "code/privilege-escalation/linux/binary/privesc-posh.yaml"

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