CVE-2023-38495 in Crossplane
Summary
by MITRE • 07/27/2023
Crossplane is a framework for building cloud native control planes without needing to write code. In versions prior to 1.11.5, 1.12.3, and 1.13.0, Crossplane's image backend does not validate the byte contents of Crossplane packages. As such, Crossplane does not detect if an attacker has tampered with a Package. The problem has been fixed in 1.11.5, 1.12.3 and 1.13.0. As a workaround, only use images from trusted sources and keep Package editing/creating privileges to administrators only.
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Analysis
by VulDB Data Team • 08/20/2023
Crossplane represents a significant framework within cloud native environments that enables organizations to build custom control planes without writing code, fundamentally altering how infrastructure management operates in modern cloud architectures. The vulnerability identified as CVE-2023-38495 specifically targets the image backend validation mechanism within Crossplane's package handling system, creating a critical security gap that directly impacts the integrity of deployed cloud native control planes. This flaw exists in versions prior to 1.11.5, 1.12.3, and 1.13.0, representing a substantial attack surface that could be exploited by malicious actors seeking to compromise cloud infrastructure deployments.
The technical flaw manifests in Crossplane's failure to validate byte contents of packages during the image backend processing, creating a scenario where attackers can manipulate package contents without detection. This vulnerability directly maps to CWE-20, which describes improper input validation, and specifically relates to the absence of integrity checks that should occur during package installation and execution. The underlying issue stems from insufficient cryptographic verification mechanisms within the package management system, allowing for potential code injection or malicious payload execution. Attackers could exploit this by creating malicious packages that appear legitimate but contain unauthorized code or backdoors, undermining the security assurances typically provided by cloud native control plane frameworks.
The operational impact of this vulnerability extends beyond simple code execution, as it fundamentally compromises the trust model that Crossplane relies upon for secure infrastructure management. Organizations deploying Crossplane in production environments face significant risks including unauthorized access to cloud resources, potential data breaches, and complete compromise of their cloud control plane integrity. The vulnerability affects the core security posture of cloud native deployments, as it allows attackers to bypass the normal package validation mechanisms that should prevent malicious code from being executed within the control plane. This represents a critical failure in the supply chain security model, where the integrity of deployed packages cannot be guaranteed, potentially leading to cascading security failures across interconnected cloud services.
Mitigation strategies for CVE-2023-38495 focus on immediate version upgrades to patched releases, specifically 1.11.5, 1.12.3, and 1.13.0, which implement proper package validation mechanisms. Organizations should also implement strict access controls, limiting package editing and creation privileges to administrative users only, thereby reducing the attack surface. The workaround recommendations align with the principle of least privilege and supply chain security best practices, emphasizing the importance of trusted source verification and administrative access controls. From an ATT&CK framework perspective, this vulnerability relates to T1548.001 (Abuse Elevation Control Mechanism) and T1059.001 (Command and Scripting Interpreter), as attackers could leverage the compromised package integrity to establish persistence and execute malicious commands within cloud environments. Organizations should also implement continuous monitoring of package installations and cryptographic verification processes to detect potential exploitation attempts and maintain defense in depth strategies against similar supply chain attacks.