A vulnerability, which was classified as critical, was found in NLTK Downloader up to 3.4.4. Affected is some unknown processing of the component ZIP Archive Handler. The manipulation with the input value ../ leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on integrity, and availability. CVE summarizes:

NLTK Downloader before 3.4.5 is vulnerable to a directory traversal, allowing attackers to write arbitrary files via a ../ (dot dot slash) in an NLTK package (ZIP archive) that is mishandled during extraction.

The weakness was shared 08/22/2019 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2019-14751 since 08/07/2019. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 3.4.5 eliminates this vulnerability.

Productinfo

Vendor

• NLTK

Name

• Downloader

Version

• 3.4.0
• 3.4.1
• 3.4.2
• 3.4.3
• 3.4.4

License

• open-source

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