CVE-2008-2092 in SPA-2102 Phone Adapter
Summary
by MITRE
Linksys SPA-2102 Phone Adapter 3.3.6 allows remote attackers to cause a denial of service (crash) via a long ping packet ("ping of death"). NOTE: the severity of this issue has been disputed since there are limited attack scenarios.
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Analysis
by VulDB Data Team • 12/03/2024
The CVE-2008-2092 vulnerability affects the Linksys SPA-2102 Phone Adapter version 3.3.6, representing a classic denial of service weakness that exploits buffer handling flaws in network device firmware. This vulnerability specifically targets the device's ping functionality, which is commonly used for network diagnostics and connectivity verification. The issue manifests when an attacker sends an unusually long ping packet to the device, triggering a buffer overflow condition that causes the system to crash and become unavailable to legitimate users. The vulnerability falls under the broader category of buffer overflow attacks that have been documented in cybersecurity literature for decades, with similar patterns observed in numerous network infrastructure devices.
The technical flaw in this vulnerability stems from inadequate input validation and buffer management within the SPA-2102's network processing routines. When the device receives a ping packet larger than the allocated buffer space, the system fails to properly handle the overflow condition, leading to a system crash or reboot. This behavior aligns with common software security weaknesses classified under CWE-121, which deals with stack-based buffer overflow conditions. The vulnerability demonstrates poor defensive programming practices where the device does not implement proper bounds checking or input sanitization before processing network traffic. The specific nature of the attack vector makes it particularly concerning for network administrators who rely on these devices for voice communication services, as a successful exploitation could disrupt critical business communications.
The operational impact of CVE-2008-2092 extends beyond simple service disruption to potentially compromise business continuity and network reliability. In enterprise environments where VoIP infrastructure is critical for communication, a denial of service attack on the SPA-2102 could result in significant productivity losses and communication breakdowns. The vulnerability's limited attack scenarios, as noted in the original description, suggest that exploitation requires specific network access conditions and may not be easily automated. However, the potential for remote exploitation means that attackers with network access could leverage this weakness to disrupt services without physical proximity to the device. The issue's severity classification has been disputed in the cybersecurity community, with some experts arguing that the attack surface is limited due to the need for network access and the specific conditions required for successful exploitation.
Security professionals should consider this vulnerability as part of broader network infrastructure security assessments, particularly when evaluating the resilience of voice communication systems. Mitigation strategies should include firmware updates from Linksys to address the buffer overflow condition, network segmentation to limit unauthorized access, and implementation of intrusion detection systems that can identify unusual ping traffic patterns. The vulnerability also highlights the importance of applying security patches promptly, as older firmware versions may contain similar buffer handling flaws. Organizations should implement network monitoring to detect potential exploitation attempts and establish incident response procedures for dealing with denial of service events. From an ATT&CK framework perspective, this vulnerability maps to techniques involving service stoppage and system resource exhaustion, demonstrating how seemingly benign network utilities can be weaponized for malicious purposes. The case also underscores the necessity of network device hardening and regular security assessments to identify and remediate similar weaknesses across the entire network infrastructure.