CVE-2012-1821 in Endpoint Protection
Summary
by MITRE
The Network Threat Protection module in the Manager component in Symantec Endpoint Protection (SEP) 11.0.600x through 11.0.700x on Windows Server 2003 allows remote attackers to cause a denial of service (web-server outage, or daemon crash or hang) via a flood of packets that triggers automated blocking of network traffic.
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Analysis
by VulDB Data Team • 01/02/2025
The vulnerability identified as CVE-2012-1821 resides within Symantec Endpoint Protection's Network Threat Protection module, specifically affecting versions 11.0.600x through 11.0.700x running on Windows Server 2003 systems. This flaw represents a significant security weakness that can be exploited by remote attackers to disrupt network operations through deliberate denial of service attacks. The vulnerability manifests when the system processes an excessive volume of network packets that trigger its automated traffic blocking mechanisms, ultimately leading to complete service disruption. The Network Threat Protection module is designed to monitor and control network traffic patterns to identify potential threats, but this particular implementation fails to properly handle high-volume packet flooding scenarios. The affected environment specifically targets Windows Server 2003, which represents an older operating system platform that may lack modern security mitigations and is particularly susceptible to such resource exhaustion attacks.
The technical mechanism behind this vulnerability involves the system's response to network traffic patterns that exceed normal operational thresholds. When attackers flood the system with packets that trigger the automated blocking functionality, the Network Threat Protection module becomes overwhelmed and enters a state of resource exhaustion or deadlock. This condition results in the web server becoming unresponsive, daemon processes crashing, or system hang conditions that effectively render the protection service unavailable. The flaw demonstrates a classic resource exhaustion attack pattern where legitimate system functionality is disrupted by overwhelming the system with traffic patterns designed to trigger defensive mechanisms. The vulnerability operates at the network protocol level and leverages the system's legitimate security features to cause unintended service disruption rather than exploiting direct code execution vulnerabilities.
The operational impact of this vulnerability extends beyond simple service interruption to potentially compromise the entire security infrastructure of affected systems. When the Network Threat Protection module becomes unresponsive, it creates a window of vulnerability where the system cannot properly monitor or control network traffic, leaving the network exposed to actual threats. This creates a paradoxical situation where defensive mechanisms fail to protect against malicious activity while simultaneously making the system vulnerable to further attacks. The disruption affects both the availability and integrity of the security monitoring capabilities, potentially allowing attackers to bypass security controls or perform additional attacks that would otherwise be detected and blocked by the system. Organizations relying on these specific versions of Symantec Endpoint Protection face critical operational risks when this vulnerability is exploited, particularly in environments where continuous network monitoring is essential for security operations.
Mitigation strategies for CVE-2012-1821 should focus on immediate version upgrades to Symantec Endpoint Protection 11.0.800x or later, which contain patches addressing the packet flooding vulnerability. Organizations should implement network-level controls such as rate limiting and traffic shaping to prevent the specific packet patterns that trigger the vulnerability. The implementation of intrusion detection systems and network monitoring tools can help detect and alert on unusual traffic patterns that may indicate exploitation attempts. Security administrators should also consider disabling or restricting the Network Threat Protection module functionality until proper patches are applied, particularly in environments where the risk of exploitation is high. Additionally, implementing proper network segmentation and access controls can limit the potential impact of successful exploitation attempts, while maintaining detailed logging and monitoring to detect any unauthorized access attempts. This vulnerability aligns with CWE-400, which addresses improper handling of resource exhaustion conditions, and maps to attack techniques in the ATT&CK framework under network denial of service categories, specifically targeting the availability of network services and system resources.