CVE-2008-4404 in zSeries
Summary
by MITRE
The IPv6 Neighbor Discovery Protocol (NDP) implementation on IBM zSeries servers does not validate the origin of Neighbor Discovery messages, which allows remote attackers to cause a denial of service (loss of connectivity) or read private network traffic via a spoofed message that modifies the Forward Information Base (FIB), a related issue to CVE-2008-2476.
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Analysis
by VulDB Data Team • 07/26/2024
The vulnerability described in CVE-2008-4404 represents a critical flaw in the IPv6 Neighbor Discovery Protocol implementation on IBM zSeries mainframe servers. This issue stems from insufficient validation mechanisms within the network stack that processes Neighbor Discovery messages, creating an avenue for malicious actors to manipulate network routing information. The vulnerability specifically affects the Forward Information Base management system, which serves as the core routing table for IPv6 traffic on affected systems.
The technical root cause of this vulnerability lies in the absence of proper message origin authentication within the IPv6 Neighbor Discovery Protocol implementation. When a spoofed Neighbor Discovery message is received, the system fails to verify the legitimacy of the sender, allowing unauthorized modifications to the Forward Information Base. This occurs because the implementation does not properly validate source addresses or message integrity, directly violating fundamental network security principles. The flaw operates at the network protocol level, specifically targeting the IPv6 neighbor discovery mechanism that is essential for maintaining proper network connectivity and routing information.
From an operational perspective, this vulnerability creates significant risks for IBM zSeries server environments that rely on IPv6 connectivity. Remote attackers can exploit this weakness to cause complete loss of network connectivity for affected systems, effectively performing a denial of service attack that impacts business-critical applications and services. Additionally, the vulnerability enables eavesdropping capabilities, as attackers can manipulate routing tables to redirect traffic through compromised paths where private network information can be intercepted and read. This dual nature of the attack makes it particularly dangerous for enterprise environments where network security and data integrity are paramount.
The impact of this vulnerability extends beyond simple connectivity issues, as it undermines the fundamental trust model of IPv6 networks. According to CWE classification, this represents a weakness in validation of data received from a network resource, specifically CWE-20, which encompasses input validation failures that can lead to various security consequences. The vulnerability also aligns with ATT&CK techniques related to network sniffing and route manipulation, as it provides adversaries with capabilities to modify network routing information and intercept communications. Organizations using IBM zSeries systems in IPv6 environments face potential exposure to sophisticated attacks that could compromise entire network segments.
Mitigation strategies for this vulnerability should focus on implementing proper message validation mechanisms within the IPv6 Neighbor Discovery Protocol implementation. Network administrators should consider deploying network segmentation and monitoring solutions to detect anomalous Neighbor Discovery traffic patterns. The most effective long-term solution involves updating affected IBM zSeries systems with patches that properly validate Neighbor Discovery message origins and implement proper authentication mechanisms. Additionally, organizations should consider implementing network access controls and intrusion detection systems to monitor for suspicious routing table modifications, as these can serve as indicators of exploitation attempts. The vulnerability also underscores the importance of maintaining up-to-date security patches and implementing robust network monitoring practices to detect and respond to similar protocol-level attacks.