CVE-2024-8996 in Agent Flow
Summary
by MITRE • 09/25/2024
Unquoted Search Path or Element vulnerability in Grafana Agent (Flow mode) on Windows allows Privilege Escalation from Local User to SYSTEM This issue affects Agent Flow: before 0.43.2
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Analysis
by VulDB Data Team • 11/08/2024
The vulnerability CVE-2024-8996 represents a critical unquoted search path or element weakness in Grafana Agent running in Flow mode on Windows systems. This flaw specifically impacts versions prior to 0.43.2 and creates a significant privilege escalation vector that allows local users to elevate their privileges from standard user level to SYSTEM level. The vulnerability stems from how the Grafana Agent processes search paths when executing components, particularly in Windows environments where the operating system performs path resolution without proper quote handling. When a service or application attempts to locate executables or libraries, it searches through a series of directories in the PATH environment variable. In the case of Grafana Agent Flow mode, the lack of proper quoting in search paths creates opportunities for malicious actors to place malicious executables in directories that are searched before the legitimate ones, leading to arbitrary code execution with elevated privileges.
This vulnerability operates under the Common Weakness Enumeration (CWE) classification of CWE-428, which specifically addresses "Unquoted Search Path or Element" weaknesses. The operational impact of this vulnerability is severe as it directly enables privilege escalation attacks that can be exploited by any local user who has access to the system. The attacker needs only to place a malicious executable in a directory that will be searched before the legitimate Grafana Agent components, and when the agent executes, it will run the malicious code with SYSTEM privileges. This creates a persistent backdoor that can be used to maintain access to the compromised system, escalate further attacks, and potentially compromise the entire network infrastructure. The attack vector is particularly concerning because it leverages the default behavior of Windows path resolution without proper security controls, making it difficult to detect and prevent through standard security measures.
The exploitability of this vulnerability is enhanced by the fact that Grafana Agent Flow mode is commonly deployed in enterprise environments where local user access may be more prevalent than in controlled server environments. The privilege escalation from local user to SYSTEM provides attackers with complete control over the affected system, including the ability to modify system files, install additional malware, access sensitive data, and potentially pivot to other systems within the network. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting T1068 which covers "Local Privilege Escalation." Organizations running affected versions of Grafana Agent should immediately implement mitigations including updating to version 0.43.2 or later, implementing proper PATH environment variable controls, and conducting thorough security audits of all installed services and agents on Windows systems. Additionally, system administrators should consider implementing application whitelisting policies and monitoring for suspicious executable launches from directories that are not properly secured. The vulnerability demonstrates the critical importance of secure coding practices and proper path handling in service applications, particularly in environments where privilege separation is essential for maintaining system security and integrity.