How Threat Actors are Abusing GitHub’s File Upload Feature t...

GitHub's file upload feature is currently being exploited by threat actors to host malware, leveraging a flaw in its content delivery network (CDN) that allows malicious files to be hosted on public repositories. This vulnerability has been utilized to spread malware, including the Redline Stealer trojan, by uploading files to GitHub issues and comments, which are then hosted on GitHub's Amazon S3 instance. Attackers can lend credibility to their malicious links by associating them with legitimate-looking repositories, a tactic similar to "starjacking." While GitHub has removed offending files, it has not taken significant actions to prevent such abuses, allowing attackers to spoof security tools, impersonate development tools, and inject malicious code into data science and open source projects. The issue also extends to GitLab, where similar abuses can occur, although users must be logged in to upload files. The situation highlights the need for developers and researchers to vigilantly verify the integrity of files downloaded from seemingly trustworthy repositories to avoid falling victim to these sophisticated malware distribution techniques.

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