In this in-depth analysis, we explore the remote code execution vulnerability (CVE-2022-46648) discovered in ruby-git versions before v1.13.. It allows a remote authenticated attacker to execute arbitrary Ruby code through a specially crafted filename in a loaded repository. This vulnerability is distinct from the previously identified CVE-2022-47318.

Vulnerability Details

The ruby-git library is a popular tool for working with Git repositories in Ruby applications. In versions prior to v1.13., a remote authenticated attacker can leverage a vulnerability where the input is not properly sanitized when manipulating Git repositories. As a result, it is possible to inject malicious Ruby code through crafted filenames embedded into a loaded repository.

Exploit Details

In the vulnerable versions of ruby-git, the attacker can create a malicious Git repository with a specially crafted filename containing Ruby code. Once the victim loads this repository into their Ruby application using ruby-git, the embedded Ruby code is executed without any restrictions on the victim's system.

For example, an attacker can create a Git repository with a filename containing the following Ruby code:

#{touch arbitrary_code_executed}

The exploit can be triggered by unsuspecting users using the following Ruby script

require 'git'

repo = Git.clone('https://github.com/attacker/malicious-repo.git';, 'local-repo')

# ... code for working with the Git repository ...

In this example, the Ruby script clones the malicious repository, and the attacker's payload within the crafted filename creates a file named "arbitrary_code_executed" on the victim's system.

1. CVE Details: https://nvd.nist.gov/vuln/detail/CVE-2022-46648
2. Ruby-gem Advisory: https://rubygems.org/gems/git/versions/1.13.
3. GitHub Commit: https://github.com/ruby-git/ruby-git/commit/01542388e9c24f5a3b05bf930e1f520f3f9b6a35

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2. Review your code to ensure that all instances of the Git.clone method and any other potentially vulnerable methods are no longer using the insecure ruby-git versions.

3. Educate your team members about the risks associated with using outdated and vulnerable libraries, and promote a culture of continuous security vigilance.

Conclusion

CVE-2022-46648 is a dangerous remote code execution vulnerability in the ruby-git library, affecting versions prior to v1.13.. By exploiting this vulnerability, an attacker can execute arbitrary Ruby code on an unsuspecting user's system, leading to severe consequences such as data theft, unauthorized access, and system compromise. Updating to the secure version and following best security practices is vital in preventing this vulnerability from causing harm to systems and user data.

Timeline

Published on: 01/17/2023 10:15:00 UTC
Last modified on: 02/02/2023 18:45:00 UTC