CVE-2023-2273 in Insight Agent
Summary
by MITRE • 04/26/2023
Rapid7 Insight Agent token handler versions 3.2.6 and below, suffer from a Directory Traversal vulnerability whereby unsanitized input from a CLI argument flows into io.ioutil.WriteFile, where it is used as a path. This can result in a Path Traversal vulnerability and allow an attacker to write arbitrary files. This issue is remediated in version 3.3.0 via safe guards that reject inputs that attempt to do path traversal.
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Analysis
by VulDB Data Team • 05/20/2023
The vulnerability identified as CVE-2023-2273 affects Rapid7 Insight Agent token handler versions 3.2.6 and earlier, representing a critical directory traversal flaw that stems from inadequate input validation within the command line interface. This weakness creates a pathway for attackers to manipulate file system operations through unsanitized command line arguments that are subsequently passed to the io.ioutil.WriteFile function. The core technical flaw manifests when user-provided input containing directory traversal sequences such as ../ or ..\ is accepted without proper sanitization, allowing malicious actors to specify arbitrary file paths for writing operations. The vulnerability operates at the intersection of improper input validation and unsafe file handling practices, making it particularly dangerous for environments where the agent executes with elevated privileges.
The operational impact of this vulnerability extends beyond simple file system manipulation, as it enables attackers to write arbitrary files to locations within the target system's file hierarchy. This capability can lead to persistent backdoor installation, configuration file corruption, or the creation of malicious executables that maintain access to compromised systems. The vulnerability's exploitation potential is amplified by the fact that the token handler likely operates with sufficient privileges to write to critical system directories, potentially enabling privilege escalation attacks. From a cybersecurity perspective, this flaw represents a classic path traversal vulnerability that aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory. The vulnerability's remediation in version 3.3.0 demonstrates the importance of implementing proper input validation and path sanitization mechanisms.
Security practitioners should recognize this vulnerability as a prime example of how insufficient input validation can create persistent security weaknesses in agent-based systems. The attack surface is particularly concerning for enterprise environments where Rapid7 Insight Agent is deployed across multiple endpoints, as a single compromised agent could potentially provide attackers with the means to write files to critical system locations. The remediation approach taken by Rapid7 in version 3.3.0, which includes the implementation of safeguards that explicitly reject inputs attempting path traversal, aligns with recommended defensive strategies outlined in the MITRE ATT&CK framework under techniques related to privilege escalation and persistence. Organizations should prioritize immediate patching of affected systems and implement additional monitoring for unusual file system write operations that could indicate exploitation attempts. The vulnerability also highlights the necessity of applying principle of least privilege to agent processes and implementing proper file system access controls to limit the potential damage from such path traversal attacks.