CVE-2019-14751

Published: 20 August 2019

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.

From the Ubuntu security team

It was discovered that NLTK mishandled crafted ZIP archives during extraction. A remote attacker could use this vulnerability to write arbitrary files to the filesystem

Priority

Medium

CVSS 3 base score: 7.5

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14751
• https://github.com/nltk/nltk/blob/3.4.5/ChangeLog
• https://salvatoresecurity.com/zip-slip-in-nltk-cve-2019-14751/
• https://github.com/mssalvatore/CVE-2019-14751_PoC
• https://ubuntu.com/security/notices/USN-4106-1
• NVD
• Launchpad
• Debian

Bugs

• http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=935201