stdbuf - Privilege Escalation

ID: privesc-stdbuf

Severity: high

Author: daffainfo

Tags: code,linux,stdbuf,privesc,local

Description

The stdbuf command is used to modify the buffering operations of another command. It can be used to adjust the input/output buffering of a command, which can be useful for controlling the flow of data and improving the performance of certain operations.

YAML Source

id: privesc-stdbuf

info:
  name: stdbuf - Privilege Escalation
  author: daffainfo
  severity: high
  description: |
    The stdbuf command is used to modify the buffering operations of another command. It can be used to adjust the input/output buffering of a command, which can be useful for controlling the flow of data and improving the performance of certain operations.
  reference:
    - https://gtfobins.github.io/gtfobins/stdbuf/
  metadata:
    verified: true
    max-request: 3
  tags: code,linux,stdbuf,privesc,local

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

  - engine:
      - sh
      - bash
    source: |
      stdbuf -i0 whoami

  - engine:
      - sh
      - bash
    source: |
      sudo stdbuf -i0 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: 4b0a0048304602210085cba2a30005f4f9c23a11929f87585140347123e6bec9a5819aa7c245f601f7022100a3b46722f3fa1c936780bd46b5b1ab2003171ee49e74bab5877174a53fad9fab: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-stdbuf.yaml"

View on Github