Skip to content

🛡️ Sentinel: [CRITICAL] Fix Path Traversal (Zip Slip) in Skills Import #132

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
thirdeyenation wants to merge 1 commit into
base: main
Choose a base branch
from
Open

🛡️ Sentinel: [CRITICAL] Fix Path Traversal (Zip Slip) in Skills Import #132

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 4 additions & 0 deletions .jules/sentinel.md
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
## 2025-05-23 - Prevent Zip Slip Vulnerability in Skills Import
**Vulnerability:** Path traversal (Zip Slip) vulnerability found in `helpers/skills_import.py` when using `z.extractall()` without validating archive members.
**Learning:** `zipfile.ZipFile.extractall()` does not inherently prevent path traversal using relative paths (`../`), allowing maliciously crafted ZIP files to overwrite files outside the intended extraction directory.
**Prevention:** Always validate every member of `z.namelist()` to ensure its resolved absolute path falls within the intended target directory before extracting.
5 changes: 5 additions & 0 deletions helpers/skills_import.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,11 @@ def _unzip_to_temp_dir(zip_path: Path) -> Path:
target.mkdir(parents=True, exist_ok=True)

with zipfile.ZipFile(zip_path, "r") as z:
target_resolved = target.resolve()
for member in z.namelist():
member_path = (target / member).resolve()
if not member_path.is_relative_to(target_resolved):
raise ValueError(f"Unsafe path in archive: {member}")
z.extractall(target)

# If zip contains a single top-level folder, treat that as the root
Expand Down