CVE-2010-4678 in ASA
Summary
by MITRE
Cisco Adaptive Security Appliances (ASA) 5500 series devices with software before 8.2(3) permit packets to pass before the configuration has been loaded, which might allow remote attackers to bypass intended access restrictions by sending network traffic during device startup, aka Bug ID CSCsy86769.
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Analysis
by VulDB Data Team • 11/30/2024
The vulnerability described in CVE-2010-4678 affects Cisco Adaptive Security Appliances (ASA) 5500 series devices operating with software versions prior to 8.2(3). This represents a critical security flaw that stems from improper initialization sequences during device startup, creating a window of opportunity for malicious actors to exploit the system before proper security policies are enforced. The issue manifests as a race condition between the device's boot process and the enforcement of access control mechanisms, allowing unauthorized network traffic to traverse the appliance during its initial configuration phase.
The technical root cause of this vulnerability lies in the timing of configuration loading and packet processing within the ASA firmware. During the boot sequence, the device begins accepting and forwarding network packets before all security policies and access control lists have been fully loaded and applied. This creates a temporary state where the appliance operates in a permissive mode, effectively disabling the intended firewall protections. The vulnerability is particularly concerning because it occurs during the most critical phase of device operation when security controls should be at their strongest. This flaw enables attackers to establish connections, traverse network boundaries, and potentially gain unauthorized access to protected network segments before the device can properly enforce its security policies.
The operational impact of this vulnerability extends beyond simple access bypass to encompass significant network security risks. Attackers can exploit this window to perform reconnaissance activities, establish backdoors, or conduct man-in-the-middle attacks while the device is initializing. The vulnerability affects the fundamental security model of the ASA appliance, potentially allowing remote code execution or complete network compromise depending on the attack vector and network topology. Organizations relying on these devices for perimeter security face severe risks, as the window of vulnerability could be exploited by automated scanning tools or targeted attacks, potentially leading to complete network infiltration. This weakness directly violates the principle of least privilege and undermines the trust model that network security appliances are designed to enforce.
Mitigation strategies for CVE-2010-4678 require immediate software updates to version 8.2(3) or later, which addresses the timing issue in the configuration loading process. Network administrators should also implement additional protective measures such as configuring the device to perform a complete boot sequence before accepting traffic, utilizing the fail-safe mechanisms available in newer firmware versions, and monitoring for unauthorized network access during device startup. The vulnerability aligns with CWE-362, which describes a race condition in security-critical operations, and relates to ATT&CK technique T1072 for software deployment tools, as it involves exploitation of a system during the boot process. Organizations should also consider implementing network segmentation and monitoring solutions to detect anomalous traffic patterns during device initialization, while maintaining strict access controls and regular security audits to ensure proper device configuration and operational security practices are maintained across all network infrastructure components.