ssh-agent - Privilege Escalation

ID: privesc-ssh-agent

Severity: high

Author: daffainfo

Tags: code,linux,ssh-agent,privesc,local

Description

ssh-agent is a program that helps manage and store private keys used for SSH authentication. It is often used to hold the decrypted private keys in memory, allowing for seamless authentication to remote servers without the need to re-enter passphrases for the keys.

YAML Source

id: privesc-ssh-agent

info:
  name: ssh-agent - Privilege Escalation
  author: daffainfo
  severity: high
  description: |
    ssh-agent is a program that helps manage and store private keys used for SSH authentication. It is often used to hold the decrypted private keys in memory, allowing for seamless authentication to remote servers without the need to re-enter passphrases for the keys.
  reference:
    - https://gtfobins.github.io/gtfobins/ssh-agent/
  metadata:
    verified: true
    max-request: 3
  tags: code,linux,ssh-agent,privesc,local

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

  - engine:
      - sh
      - bash
    source: |
      ssh-agent whoami

  - engine:
      - sh
      - bash
    source: |
      sudo ssh-agent 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: 4a0a0047304502204e2fb64b9b5adb5fcdf7db3b287f52fef8feb7a65d1908b39e58e00c345c8514022100c16edc7143fda13e12eed4dbce5115586cc5afb90980f6fc42e35204df70316b: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-ssh-agent.yaml"

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