A 15-Year-Old Unpatched Python bug potentially impacts over 350,000 projects

Une « erreur humaine » à l’origine d’un bug sur Legifrance frappant la LCEN

More than 350,000 open source projects can be potentially affected by an unpatched Python vulnerability, tracked as CVE-2007-4559 (CVSS score: 6.8), that was discovered 15 years ago.

The issue is a Directory traversal vulnerability that resides in the ‘extract’ and ‘extractall’ functions in the tarfile module in Python. A user-assisted remote attacker can trigger the issue to overwrite arbitrary files via a .. (dot dot) sequence in filenames in a TAR archive, a related issue to CVE-2001-1267.

“While investigating an unrelated vulnerability, Trellix Advanced Research Center stumbled across a vulnerability in Python’s tarfile module. Initially we thought we had found a new zero-day vulnerability. As we dug into the issue, we realized this was in fact CVE-2007-4559.” reads the post published by security firm Trellix.”The vulnerability is a path traversal attack in the extract and extractall functions in the tarfile module that allow an attacker to overwrite arbitrary files by adding the “..” sequence to filenames in a TAR archive.”

The experts pointed out that the issue was underestimated, it initially received a CVSS score of 6.8, however, in most cases an attacker exploit this issue to gain code execution from the file write. Trellix shared a video PoC that shows how to get code execution by exploiting Universal Radio Hacker:

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