CVE-2021-32673 in reg-suit
Summary
by MITRE • 06/08/2021
reg-keygen-git-hash-plugin is a reg-suit plugin to detect the snapshot key to be compare with using Git commit hash. reg-keygen-git-hash-plugin through and including 0.10.15 allow remote attackers to execute of arbitrary commands. Upgrade to version 0.10.16 or later to resolve this issue.
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Analysis
by VulDB Data Team • 06/11/2021
The vulnerability identified as CVE-2021-32673 affects the reg-keygen-git-hash-plugin, a component within the reg-suit ecosystem designed to generate snapshot keys for comparison purposes using Git commit hashes. This plugin serves as an integration point for continuous integration and deployment workflows, where it processes Git repository information to establish consistent snapshot identification mechanisms. The flaw exists in versions 0.10.15 and earlier, creating a critical security risk that allows remote attackers to execute arbitrary commands on systems where the plugin is installed.
The technical implementation of this vulnerability stems from improper input validation and sanitization within the plugin's Git hash processing functionality. When the plugin encounters certain Git commit hash values or associated metadata, it fails to properly sanitize user-supplied inputs before incorporating them into system commands or shell operations. This insecure handling of Git repository data creates a command injection vector that attackers can exploit to execute malicious code with the privileges of the user running the plugin. The vulnerability aligns with CWE-78, which specifically addresses improper neutralization of special elements used in OS commands, and represents a classic example of command injection flaws in software components that interact with external systems.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with potential access to the entire CI/CD pipeline infrastructure where the plugin operates. Attackers could leverage this vulnerability to modify build processes, access sensitive repository data, or even compromise the underlying deployment systems. The remote nature of the attack means that an attacker does not need physical access to the system or network, making the vulnerability particularly dangerous in environments where the plugin is exposed to untrusted inputs from external sources. This vulnerability directly maps to several ATT&CK techniques including T1059.001 for command and scripting interpreter and T1021.004 for remote services, demonstrating how the flaw enables lateral movement and system compromise through automated processes.
Organizations utilizing the affected plugin should immediately upgrade to version 0.10.16 or later to mitigate this risk, as the update includes proper input sanitization measures and command execution restrictions. Additional mitigations include implementing network segmentation to limit exposure of systems running the plugin, monitoring for unusual command execution patterns, and conducting thorough security reviews of all CI/CD components. The vulnerability highlights the critical importance of validating all external inputs in automated systems and demonstrates how seemingly benign plugin functionality can become a gateway for sophisticated attacks when proper security controls are not implemented. Security teams should also consider implementing runtime application protection measures and regular vulnerability scanning to identify similar issues in other pipeline components that may be susceptible to similar injection attacks.