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Home > Cybersecurity > 15-year-old Python bug affects thousands of open-source repositories

15-year-old Python bug affects thousands of open-source repositories

Trellix Advanced Research Center pinpoints a vulnerability in Python's tarfile module, affecting 350,000 open-source projects.


Erdem Yasar Erdem Yasar
September 22, 2022
2 min read
15-year-old Python bug affects thousands of open-source repositories
  • Trellix announced the establishment of the Trellix Advanced Research Center to advance global threat intelligence.
  • Trellix Advanced Research Center published its research into CVE-2007-4559, estimated to be present in over 350,000 open-source projects.
  • The vulnerability can be exploited by uploading a malicious file generated with two or three lines of simple code.

Cybersecurity company, Trellix announced the launch of the Trellix Advanced Research Center. Hundreds of security analysts and researchers are focusing on producing actionable real-time intelligence and threat indicators for the Advanced Research Center to be able to help customers against the latest cybersecurity threats. Along with the launch, Trellix Advanced Research Center also published its research into a bug that is estimated to be present in approximately 350,000 open-source projects and prevalent in closed-source projects.

Python’s tarfile module

Trellix Advanced Research Center noticed the vulnerability while investigating an unrelated vulnerability. At first sight, the team thought they found a new zero-day vulnerability, but it was a 15-year-old Python vulnerability, tracked as CVE-2007-4559.

The bug was found in the Python tarfile module, a default module for any project using Python and it can be found in frameworks created by Netflix, AWS, Intel, Facebook, Google, and applications used for machine learning, automation, and docker containerization. Tarfiles used to unarchive the tarfile, are a collection of files and metadata. Metadata includes file name, the size and checksum of the file, and information about the owner of the file when it was archived.

Christiaan Beek, Head of Adversarial & Vulnerability Research at Trellix
Christiaan Beek, Head of Adversarial & Vulnerability Research at Trellix

Once exploited by uploading a malicious file generated with two or three lines of simple code, the vulnerability allows attackers arbitrary code execution or control of a target device. To exploit the vulnerability, the attackers can add “..” with the separator for the operating system into the file name to escape the directory from which the file is supposed to be extracted to. Christiaan Beek, Head of Adversarial & Vulnerability Research at Trellix said,

« When we talk about supply chain threats, we typically refer to cyber-attacks like the SolarWinds incident, however building on top of weak code-foundations can have an equally severe impact. This vulnerability’s pervasiveness is furthered by industry tutorials and online materials propagating its incorrect usage. It’s critical for developers to be educated on all layers of the technology stack to properly prevent the reintroduction of past attack surfaces. »

See more Cybersecurity News


Tags: Trellix
Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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