CVE-2024-42509 Overview
CVE-2024-42509 is a critical command injection vulnerability in the underlying CLI service of HPE Aruba Networking Access Points. This vulnerability allows unauthenticated remote code execution by sending specially crafted packets to the PAPI (Aruba's Access Point management protocol) UDP port 8211. Successful exploitation enables an attacker to execute arbitrary code as a privileged user on the underlying operating system.
Critical Impact
Unauthenticated attackers can achieve remote code execution with privileged access on affected Aruba Access Points by exploiting the PAPI protocol on UDP port 8211.
Affected Products
- HPE Aruba Networking Access Points (PAPI protocol)
- Aruba Access Point management systems utilizing UDP port 8211
- Devices running vulnerable versions of the underlying CLI service
Discovery Timeline
- 2024-11-05 - CVE-2024-42509 published to NVD
- 2024-11-06 - Last updated in NVD database
Technical Details for CVE-2024-42509
Vulnerability Analysis
This command injection vulnerability (CWE-77) exists in the underlying CLI service of Aruba Access Points. The vulnerability stems from improper handling of input received via the PAPI (Aruba's Access Point management protocol) on UDP port 8211. When specially crafted packets are sent to this port, the CLI service fails to properly sanitize the input before passing it to system command execution functions.
The attack requires no authentication, meaning any network-adjacent or remote attacker with access to UDP port 8211 can exploit this vulnerability. Upon successful exploitation, the attacker gains the ability to execute arbitrary commands with the same privileges as the CLI service process, which runs as a privileged user on the underlying operating system. This could lead to complete system compromise, including data exfiltration, lateral movement within the network, and persistent access establishment.
Root Cause
The root cause of CVE-2024-42509 is improper neutralization of special elements used in a command (CWE-77: Command Injection). The CLI service processes packets received on the PAPI UDP port without adequate input validation or sanitization. Metacharacters or command delimiters embedded in the crafted packets are interpreted by the underlying shell, allowing attackers to inject and execute arbitrary system commands.
Attack Vector
The attack vector is network-based, requiring no user interaction or prior authentication. An attacker sends specially crafted UDP packets to port 8211, which is used by the PAPI protocol for Access Point management. The malicious payload embedded in these packets exploits the command injection flaw in the CLI service, resulting in arbitrary command execution.
The vulnerability is accessible to any attacker who can reach UDP port 8211 on the target device. This may include attackers on the same network segment, or in cases where the port is exposed to the internet, remote attackers from anywhere. The low complexity of exploitation combined with the lack of authentication requirements makes this vulnerability particularly dangerous.
Detection Methods for CVE-2024-42509
Indicators of Compromise
- Unexpected or anomalous UDP traffic to port 8211 from untrusted sources
- Unusual process spawning or command execution originating from the CLI service process
- Unauthorized configuration changes on Aruba Access Points
- Unexpected network connections initiated from Access Point devices
Detection Strategies
- Monitor network traffic for suspicious UDP packets targeting port 8211, particularly from external or untrusted IP addresses
- Implement intrusion detection signatures to identify malformed or potentially malicious PAPI protocol traffic
- Review system logs on Access Points for unusual command execution patterns or privilege escalation attempts
- Deploy network segmentation to isolate management traffic and alert on violations
Monitoring Recommendations
- Enable logging for all PAPI protocol communications on Aruba Access Points
- Implement real-time alerting for any UDP traffic to port 8211 from non-management networks
- Monitor for unexpected outbound connections from Access Point devices that could indicate post-exploitation activity
How to Mitigate CVE-2024-42509
Immediate Actions Required
- Restrict access to UDP port 8211 using firewall rules to allow only trusted management systems
- Segment management network traffic from general network access
- Apply vendor-supplied patches as soon as available
- Monitor Aruba Access Points for signs of compromise
Patch Information
HPE has released a security bulletin addressing this vulnerability. Administrators should review the HPE Security Bulletin for specific patch information and affected versions. Apply the recommended updates to all affected Aruba Access Point devices as soon as possible.
Workarounds
- Implement network access control lists (ACLs) to restrict UDP port 8211 access to authorized management stations only
- Deploy Aruba Access Points behind a properly configured firewall that blocks external access to management protocols
- Utilize VPN or other secure tunneling for remote management access rather than exposing PAPI directly
- Consider disabling the PAPI protocol if not required for your deployment
# Example firewall rule to restrict PAPI access (adjust for your environment)
# Allow PAPI traffic only from management network
iptables -A INPUT -p udp --dport 8211 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p udp --dport 8211 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
