CVE-2006-5602 in xsupplicant
Summary
by MITRE
Multiple memory leaks in xsupplicant before 1.2.6, and possibly other versions, allow attackers to cause a denial of service (memory consumption) via unspecified vectors.
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Analysis
by VulDB Data Team • 04/25/2026
The vulnerability identified as CVE-2006-5602 affects xsupplicant versions prior to 1.2.6, representing a critical memory management flaw that can be exploited to execute denial of service attacks. This issue specifically targets memory leaks within the wireless network authentication client component, which is responsible for handling IEEE 802.1X authentication processes in wireless networks. The vulnerability stems from inadequate memory deallocation practices during the authentication workflow, where allocated memory segments are not properly released after use, leading to progressive memory consumption over time. The unspecified vectors suggest that multiple attack paths exist within the authentication process, potentially including malformed authentication requests, repeated authentication attempts, or specific sequence of network communications that trigger the memory leak conditions. This flaw directly violates the principle of resource management and can be classified under CWE-401 as "Improper Release of Memory Before Removing Last Reference" and aligns with ATT&CK technique T1499.100 for resource exhaustion attacks.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the entire wireless network infrastructure's stability. When attackers exploit this memory leak, they can gradually consume available system memory until the xsupplicant process becomes unresponsive or crashes entirely, rendering wireless authentication services unavailable to legitimate users. The memory consumption pattern typically follows a progressive degradation where each successful authentication attempt or connection attempt contributes to the accumulation of unreleased memory segments. This creates a scenario where an attacker can maintain sustained denial of service by repeatedly initiating authentication processes without proper cleanup, effectively starving the system resources required for legitimate network access. The vulnerability affects wireless network environments that rely on xsupplicant for IEEE 802.1X authentication, particularly enterprise wireless networks where wireless access points and authentication servers depend on proper client behavior.
Mitigation strategies for CVE-2006-5602 primarily focus on immediate patching of affected xsupplicant installations to version 1.2.6 or later, which contains the necessary memory management fixes. System administrators should implement monitoring solutions to detect unusual memory consumption patterns in wireless authentication clients, enabling early detection of potential exploitation attempts. Network segmentation and access control measures can provide additional defense-in-depth by limiting the scope of impact if exploitation occurs. The vulnerability highlights the importance of proper memory management practices in network security components, particularly those handling authentication processes where resource exhaustion attacks can have cascading effects on network availability. Organizations should also consider implementing automated patch management processes to ensure timely deployment of security updates for wireless infrastructure components. Additionally, network administrators should establish baseline memory usage monitoring for authentication clients to quickly identify deviations that may indicate exploitation attempts, aligning with ATT&CK's defensive strategies for detecting resource exhaustion behaviors in networked systems.