CVE-2016-1245 in Quagga
Summary
by MITRE
It was discovered that the zebra daemon in Quagga before 1.0.20161017 suffered from a stack-based buffer overflow when processing IPv6 Neighbor Discovery messages. The root cause was relying on BUFSIZ to be compatible with a message size; however, BUFSIZ is system-dependent.
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Analysis
by VulDB Data Team • 09/26/2022
The vulnerability identified as CVE-2016-1245 affects the zebra daemon component within the Quagga routing software suite, specifically impacting versions prior to 1.0.20161017. This issue represents a critical security flaw that undermines the stability and security of network infrastructure relying on Quagga for routing operations. The zebra daemon serves as the core routing daemon in Quagga, responsible for managing routing table updates and forwarding decisions within network environments. When processing IPv6 Neighbor Discovery messages, the daemon fails to properly validate message boundaries, creating an exploitable condition that could lead to system compromise.
The technical root cause of this vulnerability stems from improper buffer management within the IPv6 Neighbor Discovery processing code. The implementation relies on the BUFSIZ constant, a system-defined buffer size macro typically used for standard I/O operations, to determine message buffer allocation for incoming IPv6 Neighbor Discovery packets. This approach is fundamentally flawed because BUFSIZ represents a generic buffer size suitable for standard file I/O operations, typically set to 8192 bytes on most systems, but it is not guaranteed to be adequate for network message processing. When an attacker crafts a malicious IPv6 Neighbor Discovery message that exceeds the BUFSIZ boundary, the stack-based buffer overflow occurs as the program attempts to write beyond the allocated buffer space, potentially overwriting adjacent memory locations including return addresses and control data.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, presenting significant risks to network infrastructure integrity and availability. An attacker exploiting this buffer overflow could potentially execute arbitrary code on the affected system with the privileges of the zebra daemon process, which typically runs with elevated privileges to manage routing tables and network interfaces. The vulnerability affects systems using the Quagga routing suite in environments where IPv6 Neighbor Discovery messages are processed, which includes modern network infrastructures, routers, and network security appliances. This flaw particularly impacts enterprise networks, data centers, and service provider environments where Quagga is deployed for routing services, as these systems often handle substantial network traffic and are prime targets for exploitation attempts.
This vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflow conditions occurring in stack memory regions, and demonstrates characteristics consistent with ATT&CK technique T1059.007 for Command and Scripting Interpreter: Python, though the actual exploitation would likely involve more direct memory manipulation techniques. The flaw also relates to broader network protocol processing vulnerabilities and represents a classic example of insecure coding practices in network daemon implementations where system-specific constants are inappropriately applied to network message handling. Organizations should prioritize immediate patching of affected Quagga installations to prevent potential exploitation, as the vulnerability affects core network infrastructure components and could enable attackers to gain unauthorized access to routing services, potentially leading to network disruption, traffic interception, or further compromise of connected systems.
Mitigation strategies should include immediate deployment of Quagga version 1.0.20161017 or later, which contains the necessary fixes for this buffer overflow condition. Network administrators should also implement monitoring for unusual IPv6 Neighbor Discovery traffic patterns and consider network segmentation to limit the potential impact of exploitation attempts. Additionally, implementing proper input validation and bounds checking in network daemon code, along with regular security assessments of routing software components, will help prevent similar vulnerabilities from emerging in future implementations. The vulnerability serves as a reminder of the critical importance of proper buffer management in network services and the need for security-conscious development practices when handling network protocol data.