requests-toolbelt-plus

Details

**Severity:** Critical

**Affected versions:** `= 99.9.9`

## Source: amazon-inspector (38c64ca050de4910f56bc4a652890b0a378082859cb62153762c6ae08b4b8eae)
The package impersonates the popular `requests-toolbelt` library but ships an empty `requests_toolbelt_plus/__init__.py` and places its real logic in `setup.py`. On `pip install`, setup.py checks `/proc/version` for WSL markers and, when matched, opens a TCP socket to the hardcoded IP 185.184.192.205 on port 4444, sends a JSON beacon containing `os.getlogin()`, `os.uname().nodename`, and `os.getcwd()`, then spawns a background thread that reads JSON commands from the socket and executes them via `subprocess.run(cmd, shell=True, capture_output=True, text=True)`, returning stdout/stderr to the operator — full remote command execution against the installer's machine. setup.py also appends a Python one-liner to `~/.bashrc` that re-opens the same socket, `dup2`s stdio onto it, and execs `/bin/bash -i`, giving the attacker a persistent interactive reverse shell that fires on every new login shell and survives package uninstall. The WSL-only gating is a deliberate evasion to stay dormant on non-WSL maintainer machines and execute only on targeted Windows-Subsystem-for-Linux developer hosts.

## Source: kam193 (bd626be82a68d95788077b8b3c87a960c87d971e55496791cedf85154d99087f)
Installing the package or importing the module exfiltrates basic information about the host, and the package has no other purpose.


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Category: PROBABLY_PENTEST - Packages looking like typical pentest packages, but also anything that looks like testing, exploring pre-prepared kits, research & co, with clearly low-harm possibilities.


Campaign: GENERIC-standard-pypi-install-pentest


Reasons (based on the campaign):


 - The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.


 - The package overrides the install command in setup.py to execute malicious code during installation.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packa […]

**References:**
- https://bad-packages.kam193.eu/pypi/package/requests-toolbelt-plus
- https://github.com/ossf/malicious-packages/blob/49d0cfba3689ed9b195d101d3a2a964c6a77f767/osv/malicious/pypi/requests-toolbelt-plus/MAL-2026-5519.json
- https://pypi.org/project/requests-toolbelt-plus/100.0.0
- https://pypi.org/project/requests-toolbelt-plus/2026.6.10.172624
- https://pypi.org/project/requests-toolbelt-plus/99.9.10
- https://pypi.org/project/requests-toolbelt-plus/99.9.9
- https://github.com/advisories/GHSA-36g2-fgfj-gmhq

Compromised versions (1)

• = 99.9.9

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.