Dulwich: Symlink write-through in checkout(paths=[]) via raw os.open bypasses all symlink protections
Summary
Dulwich's porcelain.checkout(paths=[...]) code path writes files using raw os.open(file_path, O_WRONLY|O_CREAT|O_TRUNC, mode) followed by f.write(obj.data). This code path does NOT call build_file_from_blob() at all, completely bypassing any symlink protections (including the unreleased d09f8af fix). os.open without O_NOFOLLOW follows symlinks at both the target file and intermediate directories, allowing arbitrary file writes.
Root Cause
At dulwich/porcelain/__init__.py:5661-5675, the checkout(paths=[...]) implementation:
file_path = _checked_worktree_path(r, path)
os.makedirs(os.path.dirname(file_path), exist_ok=True)
flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
with os.fdopen(os.open(file_path, flags, mode), "wb") as f:
f.write(obj.data)_checked_worktree_path() (line 601-631) only performs name validation — checking that the path doesn't start with / or \\ and that components pass INVALID_DOTNAMES checks. It performs zero filesystem symlink detection.
Impact
An attacker can craft a malicious repository that, when a victim clones it and runs checkout(paths=[...]), writes attacker-controlled content (with attacker-controlled permissions) to any filesystem location accessible to the user. Writing to .git/hooks/post-checkout achieves RCE on the next git checkout.
Attack Scenario
- Attacker creates a repository where HEAD has
triggeras a symlink (mode 120000, content../../.git/hooks/post-checkout), and tagv1.0hastriggeras an executable file (mode 100755, content#!/bin/sh\nmalicious_payload) - Victim clones the repository — worktree has
trigger→../../.git/hooks/post-checkout(a symlink) - Victim runs
porcelain.checkout(repo, target="v1.0", paths=["trigger"])to restore a specific file from a tag _checked_worktree_path(r, "trigger")passes — name validation only, no symlink checkos.open("trigger", O_WRONLY|O_CREAT|O_TRUNC, 0o755)follows the symlink → opens.git/hooks/post-checkoutfor writingf.write(obj.data)writes the malicious payload to the hook- Next checkout operation triggers the hook → RCE
Suggested Fix
Replace the raw os.open path with a call to build_file_from_blob (once that function is hardened against intermediate symlinks), or add explicit symlink detection: resolve the path with os.path.realpath() and verify it stays within the worktree root before opening.
Reported by zx (Jace)
Betroffene Software
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| Plattform | Paket | Anfällige Versionen | Behoben in |
|---|---|---|---|
| Python (PyPI) | dulwich | >= 0.24.0, < 1.2.8 | 1.2.8 |
Verweise
- CVSS-Vektor
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H- Schwäche (CWE)
CWE-59, CWE-61- Plattform
- Python (PyPI)
- Paket
dulwich- Veröffentlicht
- 02.10.2026
- Aktualisiert
- 11.10.2026 15:18
Quellen und Lizenzen
OSV / GitHub Advisory Database - GHSA-8w8g-wq8h-fq33 - CC BY 4.0
Schwachstellenhistorie: dulwich
Alle veröffentlichten Schwachstellen dieses Pakets (Python (PyPI)), neueste zuerst. Zeigt, ob es ein einmaliger Ausrutscher ist oder ein Paket, das man im Auge behalten muss.
- Einträge insgesamt
- 13
- Erste → letzte
- 03.2015 10.2026
- Ohne Fix
- 0
- In Angriffen ausgenutzt
- 0
Verteilung nach Schweregrad
- Kritisch 3
- Hoch 7
- Mittel 2
- Niedrig 1
Veröffentlichungen pro Jahr
- 2017: 1
- 2018: 0
- 2019: 0
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 10
früher: 2
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Dulwich: Symlink write-through in checkout(paths=[]) via raw os.open bypasses all symlink protections dieser Eintrag
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