CVE-2008-3804 in IOS
Summary
by MITRE
Unspecified vulnerability in the Multi Protocol Label Switching (MPLS) Forwarding Infrastructure (MFI) in Cisco IOS 12.2 and 12.4 allows remote attackers to cause a denial of service (memory corruption) via crafted packets for which the software path is used.
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Analysis
by VulDB Data Team • 05/26/2025
The vulnerability identified as CVE-2008-3804 resides within the Multi Protocol Label Switching Forwarding Infrastructure component of Cisco IOS software versions 12.2 and 12.4. This represents a critical security flaw that affects network infrastructure devices running these specific IOS versions, potentially compromising the stability and availability of network services. The vulnerability specifically targets the MPLS forwarding mechanisms that are fundamental to efficient packet forwarding in modern network environments, making it particularly dangerous for network operators who rely on MPLS for their core routing operations.
The technical nature of this vulnerability involves memory corruption that occurs when the software processes crafted packets through the MPLS forwarding path. This type of flaw falls under the CWE-121 category of stack-based buffer overflow, though the specific implementation appears to involve memory corruption rather than traditional buffer overflow conditions. The vulnerability is triggered when the MPLS Forwarding Infrastructure encounters specially constructed packets that exploit weaknesses in the packet processing logic, causing the system to allocate or access memory in an improper manner that leads to system instability and potential crash conditions.
The operational impact of this vulnerability extends beyond simple service disruption, as it represents a significant threat to network availability and reliability. When exploited, the vulnerability can cause the affected Cisco IOS devices to experience memory corruption that ultimately results in denial of service conditions, forcing network equipment to restart or become unresponsive. This type of attack directly impacts the availability component of the CIA triad and can have cascading effects throughout network infrastructure, particularly in environments where MPLS is extensively used for traffic engineering and Quality of Service implementations. Network administrators may experience unexpected outages and service disruptions that can affect multiple network segments simultaneously.
Mitigation strategies for this vulnerability require immediate attention from network security teams and involve several key approaches. The primary recommended action is to upgrade affected Cisco IOS devices to versions that contain patches addressing this specific vulnerability, which typically involves applying the relevant security patches provided by Cisco through their official security advisories. Network segmentation and access control measures can provide additional protection by limiting the exposure of vulnerable devices to untrusted network segments, while implementing proper packet filtering and monitoring can help detect and prevent exploitation attempts. Organizations should also consider implementing intrusion detection systems that can identify suspicious packet patterns associated with this vulnerability, as well as maintaining comprehensive network monitoring to quickly detect service disruptions that may indicate exploitation attempts. The vulnerability demonstrates the importance of maintaining up-to-date network infrastructure and following vendor security recommendations to prevent exploitation of known weaknesses in network protocols and forwarding mechanisms.