CVE-2008-1012 in Apple AirPort Extreme Base Station
Summary
by MITRE
Unspecified vulnerability in Apple AirPort Extreme Base Station Firmware 7.3.1 allows remote attackers to cause a denial of service (file sharing hang) via a crafted AFP request, related to "input validation."
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Analysis
by VulDB Data Team • 11/12/2017
The vulnerability identified as CVE-2008-1012 affects Apple AirPort Extreme Base Station firmware version 7.3.1 and represents a critical input validation flaw that enables remote attackers to induce denial of service conditions within the network infrastructure. This weakness specifically manifests through crafted Apple Filing Protocol AFP requests that are designed to exploit insufficient validation mechanisms within the firmware implementation. The vulnerability resides in the base station's handling of incoming AFP traffic, where malformed or specially constructed requests can trigger unexpected behavior in the file sharing services. The affected device operates as a wireless access point and file sharing server, making it a potential target for attackers seeking to disrupt network operations. The vulnerability is classified under CWE-20, which encompasses input validation issues, and aligns with ATT&CK technique T1499.004 for network denial of service attacks. The specific operational impact involves file sharing services becoming unresponsive or hanging, effectively preventing legitimate users from accessing shared resources through the AirPort Extreme base station. This disruption can cascade through network operations as users lose access to shared files and printers, potentially affecting business continuity and productivity. The remote exploitation capability means that attackers do not require physical access to the device or network proximity, allowing them to target the vulnerability from external network positions. The flaw demonstrates a fundamental weakness in the firmware's request processing logic where proper input sanitization and validation procedures are either absent or insufficiently implemented. Network administrators may observe intermittent connectivity issues or complete service outages when this vulnerability is successfully exploited, particularly during peak usage periods when file sharing operations are most active. The vulnerability's classification as unspecified in the original description suggests that the precise technical mechanism of the input validation failure was not fully disclosed, but the operational impact remains clear. This type of vulnerability is particularly concerning in enterprise environments where AirPort Extreme devices serve as critical network infrastructure components. The lack of proper input validation creates a pathway for attackers to manipulate the device's file sharing services through network-based attacks, potentially leading to extended service interruptions that require manual intervention to resolve.
The exploitation of this vulnerability requires minimal technical expertise and can be accomplished through automated tools that generate crafted AFP requests. The security implications extend beyond simple service disruption as the device's file sharing capabilities become completely unresponsive, forcing users to seek alternative access methods. Attackers may leverage this vulnerability as part of broader network reconnaissance efforts, using it to identify vulnerable targets within corporate networks. The firmware version 7.3.1 represents a specific release where this input validation weakness was present, indicating that subsequent updates likely addressed the issue through improved request handling mechanisms. The vulnerability's persistence in the firmware suggests that Apple may have failed to adequately test the input validation procedures for AFP services during the development cycle. Network security monitoring systems may struggle to detect this attack vector as the malicious requests appear to be legitimate network traffic until they trigger the service hang condition. The impact on enterprise environments can be significant, particularly when AirPort Extreme devices are used as primary file sharing servers for distributed teams. Organizations may experience cascading effects as users lose access to shared resources, potentially leading to decreased productivity and operational delays. The vulnerability's remote nature means that protection measures must focus on network segmentation, access controls, and proper firmware updates to prevent exploitation.
Mitigation strategies for this vulnerability should prioritize immediate firmware updates from Apple to address the input validation flaws. Network administrators should implement proper access controls to limit AFP service exposure, particularly in environments where external access is unnecessary. The deployment of network monitoring tools can help detect unusual AFP traffic patterns that may indicate exploitation attempts. Organizations should consider network segmentation to isolate AirPort Extreme devices from critical business systems, reducing the potential impact of successful exploitation. Security policies should mandate regular firmware updates and vulnerability assessments for all network infrastructure components. The implementation of intrusion detection systems specifically configured to monitor AFP traffic can provide early warning of exploitation attempts. Additionally, network administrators should disable unnecessary services such as AFP file sharing when not required, reducing the attack surface. The vulnerability serves as a reminder of the critical importance of input validation in network infrastructure firmware, where insufficient validation can lead to complete service disruption. Proper security testing during firmware development cycles is essential to prevent similar vulnerabilities from being introduced into production systems. Organizations should establish robust patch management processes to ensure timely deployment of security updates across all network devices. The incident highlights the need for comprehensive security assessments of network infrastructure components, particularly those handling file sharing and network services. Regular vulnerability scanning and penetration testing should include evaluation of firmware components to identify potential input validation weaknesses before they can be exploited by malicious actors.