CVE-2022-41387 in d8s-pdfs
Summary
by MITRE • 10/12/2022
The d8s-pdfs package for Python, as distributed on PyPI, included a potential code-execution backdoor inserted by a third party. The backdoor is the democritus-urls package. The affected version is 0.1.0.
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Analysis
by VulDB Data Team • 05/20/2025
The vulnerability identified as CVE-2022-41387 represents a sophisticated supply chain attack targeting the Python package ecosystem through the d8s-pdfs package distribution on PyPI. This incident demonstrates how attackers can compromise software repositories by inserting malicious dependencies into legitimate packages, creating a significant risk for developers who rely on third-party libraries. The attack vector specifically exploited the trust model inherent in Python's package management system where developers automatically install dependencies without thorough security verification of the entire dependency chain. The malicious code was embedded within the democritus-urls package which served as a backdoor component, allowing unauthorized remote code execution capabilities. This type of attack directly violates the principle of least privilege and demonstrates the critical importance of package integrity verification in software supply chains.
The technical flaw manifests through the unauthorized insertion of malicious code into a legitimate Python package, specifically the democritus-urls dependency that was automatically pulled in during installation of d8s-pdfs version 0.1.0. This vulnerability operates at the package level rather than at the code level, making it particularly dangerous because it bypasses traditional code analysis approaches. The backdoor functionality allows for remote code execution, which can be leveraged to gain complete control over affected systems. The attack exploits the trust relationship between package maintainers and users, where the legitimate package appears to be a normal dependency but contains hidden malicious functionality. This represents a classic example of a software supply chain compromise that aligns with CWE-829, which describes the inclusion of untrusted code in a software package, and follows patterns seen in ATT&CK technique T1133 which covers external remote services for command and control.
The operational impact of this vulnerability extends far beyond the immediate affected package, creating widespread potential for system compromise across any environment where the malicious package was installed. Organizations that relied on the d8s-pdfs package for PDF processing functionality would have unknowingly introduced a backdoor into their systems, potentially allowing attackers to execute arbitrary commands, access sensitive data, or establish persistent access. The vulnerability affects the entire Python ecosystem's trust model since it demonstrates how attackers can compromise package repositories without detection, leading to cascading effects where multiple downstream packages may be affected. System administrators and security teams would face significant challenges in identifying compromised systems, as the malicious code would appear to be legitimate functionality. This incident highlights the critical need for automated dependency scanning and continuous monitoring of package repositories to detect such supply chain compromises.
Mitigation strategies for CVE-2022-41387 require a multi-layered approach that addresses both immediate remediation and long-term prevention measures. Organizations should immediately remove any installations of the affected d8s-pdfs package version 0.1.0 and verify that no systems have been compromised through the backdoor. The recommended remediation involves updating to patched versions of the package or removing it entirely from affected environments. Security teams should implement package integrity verification processes including checksum validation, digital signatures, and automated dependency scanning tools to detect malicious packages before installation. Organizations must establish supply chain security policies that include regular audit of third-party dependencies, implementation of software composition analysis tools, and monitoring of package repositories for suspicious activity. Additionally, developers should adopt practices such as pinning package versions, using virtual environments, and implementing security gates in CI/CD pipelines to prevent installation of compromised packages. The incident underscores the importance of maintaining updated security tooling and establishing incident response procedures specifically designed for supply chain compromises, as outlined in NIST SP 800-171 and similar security frameworks that emphasize the protection of software development and distribution environments.