A 15-12 months-Previous Unpatched Python bug doubtlessly impacts +350K projectsSecurity Affairs | Darkish Tech

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Over 350,000 Open Supply Tasks Could Probably Affected by 15-12 months-Previous Unpatched Python Vulnerability

Greater than 350,000 open supply tasks could doubtlessly be affected by an unpatched Python vulnerability, tracked as CVE-2007-4559 (CVSS rating: 6.8), which was found 15 years in the past.

The difficulty is a listing traversal vulnerability that resides within the ‘extract’ and ‘extract all’ capabilities within the tarfile module in Python. A user-assisted distant attacker can set off the difficulty to overwrite arbitrary recordsdata by way of a .. (dot, dot) sequence in filenames in a TAR archive, a problem associated to CVE-2001-1267.

“Whereas investigating an unrelated vulnerability, Trellix Superior Analysis Heart stumbled upon a vulnerability within the tarfile Python module. We initially thought we had discovered a brand new zero-day vulnerability. As we investigated the difficulty, we realized that it was, in reality, CVE-2007-4559.” learn the submit printed by safety agency Trellix. “The vulnerability is a path traversal assault on the extract and extractall capabilities within the tarfile module that enables an attacker to overwrite arbitrary recordsdata by appending the sequence “..” to filenames in a TAR archive. ”

Consultants famous that the difficulty was underestimated, initially receiving a CVSS rating of 6.8, nonetheless, generally, an attacker exploits this problem to realize code execution from the file write. Trellix shared a PoC video exhibiting easy methods to get code execution by exploiting Common Radio Hacker:

https://www.youtube.com/watch?v=jqs8S51_ES

An attacker can exploit the flaw by importing a specifically crafted tar file that enables escaping the listing into which a file is meant to be extracted and reaching code execution.

“To ensure that an attacker to use this vulnerability, they need to add “..” with the working system separator (“/” or “”) within the file identify to flee the listing to which the file is meant to be extracted. . Python’s tarfile module permits us to do precisely this:” the submit continues.

tarfile python failure.jpg
Creation of a malicious file (Tellix Supply)

“The tarfile module permits customers so as to add a filter that can be utilized to parse and modify a file’s metadata earlier than it’s added to the tar archive. This enables attackers to create their exploits with simply the 6 traces of code above.”

The researchers created Creosote, a Python script that recursively searches directories, appears for .py recordsdata, after which parses them as soon as discovered. The script is used to routinely verify repositories for vulnerabilities. Creosote gives as output the checklist of recordsdata which will include vulnerabilities, classifying them into 3 classes in response to the boldness stage (weak, in all probability weak, doubtlessly weak).

Trellix added that using the Creosote instrument revealed the existence of a vulnerability within the free and open supply scientific setting Spyder Python IDE Polemarch.

“As now we have beforehand demonstrated, this vulnerability is extremely straightforward to use and requires little to no information of difficult safety matters.” concludes the report. “Attributable to this reality and the vulnerability’s prevalence within the wild, the Python tarfile module has develop into an enormous provide chain problem threatening infrastructure world wide.”

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Pierluigi Paganini

(SecurityIssues hacking, Python)






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