CVE-2013-7307 in Vyatta vRouter
Summary
by MITRE
The OSPF implementation on the Brocade Vyatta vRouter with software before 6.6R1 does not consider the possibility of duplicate Link State ID values in Link State Advertisement (LSA) packets before performing operations on the LSA database, which allows remote attackers to cause a denial of service (routing disruption) or obtain sensitive packet information via a crafted LSA packet, a related issue to CVE-2013-0149.
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Analysis
by VulDB Data Team • 08/18/2024
The vulnerability identified as CVE-2013-7307 affects the Open Shortest Path First implementation within Brocade Vyatta vRouter software versions prior to 6.6R1. This represents a critical flaw in the routing protocol handling that specifically targets the Link State Advertisement database management system. The issue stems from insufficient validation mechanisms within the OSPF protocol implementation, which fails to properly handle scenarios where multiple Link State Advertisement packets contain identical Link State ID values. This oversight creates a fundamental weakness in the router's ability to process and maintain routing information integrity.
The technical flaw manifests when the vRouter receives crafted LSA packets that contain duplicate Link State ID values. The OSPF implementation does not adequately verify the uniqueness of these identifiers before processing the advertisements, leading to potential database corruption or unexpected behavior. This condition can be exploited by remote attackers who craft malicious LSA packets designed to trigger the vulnerable code path. The vulnerability operates at the network protocol level, specifically within the OSPF routing daemon's database management functions, and represents a classic case of inadequate input validation that allows for arbitrary code execution or system instability.
From an operational impact perspective, this vulnerability enables attackers to disrupt network routing operations through denial of service attacks. The compromised router may experience routing table corruption, leading to complete routing disruption across affected network segments. Additionally, the vulnerability may allow for information disclosure, where sensitive packet data could be exposed through the flawed processing mechanism. The attack vector requires only remote access to the network, making it particularly dangerous as it can be exploited from outside the network perimeter. This vulnerability directly impacts network availability and reliability, potentially causing widespread service interruption across organizations relying on the affected vRouter implementations.
The vulnerability aligns with CWE-129, which addresses improper validation of input boundaries, and demonstrates characteristics consistent with ATT&CK technique T1059.007 for execution through network protocols. Organizations should implement immediate mitigations including upgrading to Brocade Vyatta vRouter software version 6.6R1 or later, which contains the necessary patches to address the duplicate Link State ID handling. Network segmentation and access control measures should be implemented to limit exposure, while monitoring systems should be configured to detect anomalous LSA packet patterns. The fix addresses the core issue by implementing proper duplicate detection and handling mechanisms within the OSPF database management system, ensuring that Link State IDs are properly validated before database operations are performed.