T08 · Insecure Dependencies
Note
- Location
SKILL.md:20- Finding
Unpinned Third-Party PDF Dependency
- Content
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Vulnerability Details
File Location:
SKILL.md, lines 20-27
Vulnerability Type: Unpinned third-party dependency installation
Risk Level: LowVulnerable Code
markdown - Paket `pypdf` oder `PyPDF2` Wenn kein Paket installiert ist, installiere `pypdf` bevorzugt in einer virtuellen Umgebung: ```bash python3 -m venv .venv source .venv/bin/activate python -m pip install pypdftext ### Technical Analysis The installation command retrieves `pypdf` without specifying a reviewed version or verifying an integrity hash. Consequently, the dependency installed at execution time may differ from the version originally assessed. Although using a virtual environment limits package installation to that environment, it does not protect against a compromised upstream release, package-index compromise, or an unexpectedly incompatible future release. No evidence indicates that `pypdf` or `PyPDF2` is currently malicious. This finding concerns the absence of dependency pinning and integrity verification. ### Attack Path 1. An attacker compromises the upstream package publisher account, package distribution infrastructure, or configured Python package index. 2. The attacker publishes or serves a malicious release under the legitimate `pypdf` package name. 3. A user follows the documented `python -m pip install pypdf` instruction. 4. Pip resolves and installs the attacker-controlled release because no version or hash is constrained. 5. Malicious package code may execute during installation or later when `scripts/merge_pdfs.py` imports and uses the PDF backend. ### Impact Assessment Successful exploitation could execute code with the privileges of the user running pip or the merge script. Within those privileges, a malicious dependency could access readable local files—including PDFs supplied for merging—modify writable files, tamper with generated output, or communicate data over the network where network access is available. The virtual environment d ...[truncated 67 chars]- Remediation
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Remediation Suggestions
- Pin
pypdfto a specifically reviewed version in a requirements file. - Record and enforce cryptographic hashes for all distributed artifacts.
- Install with hash verification, for example:
bash python3 -m pip install --require-hashes -r requirements.txt- Define the trusted package index explicitly and avoid untrusted extra indexes.
- Use automated dependency scanning and controlled update reviews before changing the pinned version.
- Consider documenting a reproducible environment or lock file appropriate to the project’s packaging workflow.
- Pin