CVE-2020-5867 in Controller
Summary
by MITRE
In versions prior to 3.3.0, the NGINX Controller Agent installer script 'install.sh' uses HTTP instead of HTTPS to check and install packages
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Analysis
by VulDB Data Team • 06/02/2024
The vulnerability described in CVE-2020-5867 represents a critical security flaw in the NGINX Controller Agent installer script where the installation process relies on unencrypted HTTP connections for package verification and installation activities. This issue affects versions prior to 3.3.0 and fundamentally undermines the security posture of systems that rely on automated deployment mechanisms. The flaw stems from the installer script's failure to implement secure communication protocols when interacting with package repositories, creating an environment where malicious actors can exploit the lack of encryption to compromise the installation process.
This vulnerability directly maps to CWE-319, which addresses the exposure of sensitive information through improper use of network protocols. The technical implementation flaw occurs within the installer script's network communication logic where HTTP requests are used instead of HTTPS for package validation and download operations. The absence of transport layer security means that all communication between the installer and package repositories can be intercepted, modified, or redirected by attackers positioned within the network. This creates a man-in-the-middle attack vector where threat actors can inject malicious code into the installation process or redirect downloads to compromised package sources.
The operational impact of this vulnerability extends beyond simple package installation failures, as it creates a persistent security risk for organizations deploying NGINX Controller Agents. Attackers who can intercept network traffic can manipulate the installation process to deliver malware, backdoors, or modified packages that compromise the integrity of the entire system. The vulnerability affects the principle of secure software supply chain management, where the integrity of installation processes must be guaranteed to prevent unauthorized modifications. Organizations may experience unauthorized access to their infrastructure, data breaches, or complete system compromise when this vulnerability is exploited, particularly in environments where the installer script runs with elevated privileges.
Mitigation strategies for CVE-2020-5867 should prioritize immediate patching to versions 3.3.0 or later where HTTPS enforcement is implemented. Organizations should also implement network monitoring to detect and block unencrypted HTTP traffic during installation processes, and establish secure baseline configurations that enforce HTTPS usage for all package management activities. The ATT&CK framework's technique T1133 emphasizes the importance of securing installation packages and maintaining integrity of deployment mechanisms, which directly aligns with addressing this vulnerability through proper protocol enforcement and network security controls. Additionally, organizations should conduct security assessments to ensure that all automated deployment scripts utilize encrypted communication channels and implement network segmentation to limit exposure of installation processes to untrusted network segments.