CVE-2012-5419 in ASA 1000V
Summary
by MITRE
Cisco Adaptive Security Appliance (ASA) software 8.7.1 and 8.7.1.1 for the Cisco ASA 1000V Cloud Firewall allows remote attackers to cause a denial of service (device reload) via a malformed H.225 H.323 IPv4 packet, aka Bug IDs CSCuc42812 and CSCuc88741.
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Analysis
by VulDB Data Team • 04/22/2021
The vulnerability identified as CVE-2012-5419 affects Cisco Adaptive Security Appliance software versions 8.7.1 and 8.7.1.1, specifically impacting the Cisco ASA 1000V Cloud Firewall deployment. This issue represents a critical denial of service weakness that can be exploited by remote attackers to force complete device reloads, effectively disrupting network security operations. The vulnerability manifests through malformed H.225 H.323 IPv4 packets that are processed by the ASA device's packet handling mechanisms, creating a condition where legitimate network traffic processing becomes impossible due to system instability.
The technical flaw resides in the improper validation and handling of H.225 protocol packets within the H.323 signaling mechanism of the ASA software. H.225 is a protocol used for call control in VoIP systems, and when malformed packets containing invalid or unexpected data structures are received, the ASA device fails to properly sanitize the input before processing. This inadequate input validation creates a buffer overflow condition or memory corruption scenario that ultimately leads to the device crashing and requiring a complete restart to restore functionality. The vulnerability specifically targets the packet processing engine that handles H.323 signaling traffic, which is commonly used in enterprise voice communication systems and requires proper handling by network security appliances.
The operational impact of this vulnerability extends beyond simple service disruption, as it can severely compromise network security infrastructure and availability. Organizations relying on ASA 1000V Cloud Firewall for network protection face potential exposure to unauthorized denial of service attacks that can render their security controls ineffective. The attack requires no authentication and can be executed from external network locations, making it particularly dangerous for cloud environments where network boundaries are less defined. When exploited successfully, the device reload causes temporary loss of network security policies, potentially allowing malicious traffic to bypass security controls until the device is manually restarted or automatically recovered, creating windows of vulnerability that attackers can exploit.
Mitigation strategies for this vulnerability should focus on immediate patch deployment and network segmentation to limit exposure. Cisco released software updates addressing this issue, and organizations should prioritize applying the relevant security patches to all affected ASA devices. Network administrators should also implement ingress filtering to block H.323 traffic where it is not required, and consider implementing intrusion detection systems that can identify malformed H.323 packets. Additionally, monitoring for unusual device reload patterns and implementing automated alerting mechanisms can help detect exploitation attempts. This vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and represents a classic example of how improper input validation can lead to system instability and denial of service conditions. The attack vector maps to ATT&CK technique T1499.004, which covers network disruption through denial of service attacks, demonstrating the broader threat landscape implications for network security infrastructure.
The vulnerability demonstrates the critical importance of input validation in network security devices and highlights the potential for seemingly specialized protocols like H.323 to create widespread operational impacts when not properly handled. Organizations should implement comprehensive vulnerability management programs that include regular security assessments of network infrastructure components and maintain up-to-date threat intelligence to identify similar issues in other network security appliances. The incident also underscores the necessity of robust incident response procedures that can quickly identify and contain denial of service attacks targeting security infrastructure devices, ensuring minimal impact on business operations and maintaining network security posture during remediation activities.