CVE-2023-37249: Infoblox NIOS RCE Vulnerability

CVE-2023-37249 Overview

CVE-2023-37249 is a command injection vulnerability affecting Infoblox NIOS (Network Identity Operating System) through version 8.5.1. The vulnerability exists in a faulty component that accepts malicious input without proper sanitization, allowing authenticated attackers to gain shell access on vulnerable systems. This vulnerability poses significant risk to organizations relying on Infoblox for DNS, DHCP, and IP address management (DDI) services.

Critical Impact

Authenticated attackers with network access can exploit improper input sanitization to execute arbitrary shell commands on Infoblox NIOS appliances, potentially leading to complete system compromise.

Affected Products

• Infoblox NIOS versions through 8.5.1
• Infoblox NIOS appliances running vulnerable firmware
• Infoblox virtual appliances with NIOS installations

Discovery Timeline

• 2023-08-25 - CVE-2023-37249 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-37249

Vulnerability Analysis

This vulnerability is classified as CWE-78 (OS Command Injection), a critical class of vulnerabilities that allows attackers to execute arbitrary operating system commands on the host system. The flaw stems from insufficient input validation within a component of the Infoblox NIOS platform.

When user-supplied input reaches the vulnerable component without proper sanitization, special characters and shell metacharacters are not escaped or filtered. This allows an authenticated attacker to inject malicious commands that are subsequently executed by the underlying operating system with the privileges of the NIOS service.

The attack requires network accessibility and low-privilege authentication, but once exploited, provides high impact to confidentiality, integrity, and availability. Successful exploitation grants attackers shell access to the NIOS appliance, potentially enabling data exfiltration, configuration manipulation, or lateral movement within the network infrastructure.

Root Cause

The root cause of CVE-2023-37249 lies in inadequate input sanitization within the affected NIOS component. The vulnerable code path fails to properly validate, escape, or neutralize special shell characters before passing user input to system command execution functions. This allows attackers to break out of the intended command context and execute arbitrary shell commands.

Attack Vector

The attack vector is network-based, requiring an authenticated user with low privileges to submit specially crafted input to the vulnerable component. The attack does not require user interaction beyond the initial authentication, and the scope remains unchanged (the vulnerability affects only the vulnerable system itself).

An attacker would typically:

1. Authenticate to the Infoblox NIOS system with valid credentials
2. Identify the vulnerable input field or API endpoint
3. Craft malicious input containing shell metacharacters and commands
4. Submit the payload to achieve command execution on the underlying system

Due to the sensitive nature of this vulnerability and the lack of verified proof-of-concept code, specific exploitation details are not provided. Organizations should refer to the Infoblox CVE-2023-37249 Advisory for technical guidance.

Detection Methods for CVE-2023-37249

Indicators of Compromise

• Unusual shell process spawning from NIOS application processes
• Unexpected outbound network connections from Infoblox appliances
• Anomalous commands in system logs containing shell metacharacters (;, |, &, $(), backticks)
• New user accounts or SSH keys created on NIOS systems
• Modified system configurations or scheduled tasks on Infoblox appliances

Detection Strategies

• Monitor Infoblox NIOS audit logs for suspicious input patterns containing command injection sequences
• Implement network traffic analysis to detect anomalous behavior from NIOS appliances
• Deploy endpoint detection on management networks accessing Infoblox infrastructure
• Configure SIEM rules to alert on shell command execution patterns from NIOS processes

Monitoring Recommendations

• Enable comprehensive logging on Infoblox NIOS appliances and forward logs to a centralized SIEM
• Monitor for process creation events that indicate shell spawning from NIOS services
• Implement network segmentation monitoring to detect unauthorized lateral movement from DDI infrastructure
• Review authentication logs for suspicious login patterns preceding any exploitation attempts

How to Mitigate CVE-2023-37249

Immediate Actions Required

• Identify all Infoblox NIOS installations in your environment and verify version numbers
• Review the Infoblox CVE-2023-37249 Advisory for specific patch information
• Restrict network access to NIOS management interfaces to authorized administrators only
• Implement strong authentication and audit all user accounts with access to NIOS systems
• Monitor for signs of exploitation while preparing patch deployment

Patch Information

Organizations should consult the official Infoblox CVE-2023-37249 Advisory for specific patch versions and upgrade instructions. Infoblox customers should contact their support representative or access the Infoblox Support Portal for detailed remediation guidance and updated NIOS versions that address this vulnerability.

Workarounds

• Implement strict network segmentation to limit access to NIOS management interfaces
• Enforce principle of least privilege for all NIOS user accounts
• Deploy web application firewall (WAF) rules to filter known command injection patterns if applicable to management interfaces
• Enable and review audit logging to detect potential exploitation attempts
• Consider temporarily disabling or restricting access to non-essential NIOS features until patching is complete