CVE-2024-20433 in IOS
Summary
by MITRE • 09/25/2024
A vulnerability in the Resource Reservation Protocol (RSVP) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition.
This vulnerability is due to a buffer overflow when processing crafted RSVP packets. An attacker could exploit this vulnerability by sending RSVP traffic to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
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Analysis
by VulDB Data Team • 12/30/2024
The vulnerability identified as CVE-2024-20433 represents a critical buffer overflow condition within the Resource Reservation Protocol implementation of Cisco IOS and IOS XE software platforms. This weakness specifically manifests in the processing of RSVP packets, which are essential for establishing and maintaining network resource reservations in traffic engineering scenarios. The flaw exists at the protocol parsing layer where insufficient input validation occurs when handling malformed RSVP messages, creating a potential entry point for malicious actors to disrupt network operations. The vulnerability affects a wide range of Cisco network infrastructure devices including routers and switches that implement RSVP functionality, making it particularly concerning for enterprise and service provider networks where these protocols are commonly deployed.
The technical exploitation of this vulnerability relies on crafting malicious RSVP packets that trigger a buffer overflow condition within the affected software's memory management systems. When the system processes these specially crafted packets, the buffer overflow occurs in the RSVP processing module, potentially leading to memory corruption that causes the device to crash and subsequently reload. This behavior aligns with CWE-121, which describes heap-based buffer overflow conditions, and represents a classic example of improper input validation leading to memory safety issues. The vulnerability's remote and unauthenticated nature means that attackers can exploit it from outside the network perimeter without requiring any credentials or prior access to the system, making it particularly dangerous for publicly accessible network devices.
The operational impact of CVE-2024-20433 extends beyond simple service disruption as it can cause cascading failures within network infrastructure. When an affected device experiences an unexpected reload, it can result in temporary loss of network connectivity for traffic flowing through that device, potentially affecting multiple network segments depending on the device's role within the network topology. Network administrators may experience significant operational challenges as the device becomes unavailable, requiring manual intervention to restore services, and potentially leading to extended downtime during recovery operations. The vulnerability's potential for automated exploitation means that network devices could be targeted en masse by threat actors, leading to widespread disruption across multiple network domains. According to ATT&CK framework, this vulnerability maps to T1499.004 which covers network denial of service attacks, and represents a significant threat to network availability and reliability.
Mitigation strategies for CVE-2024-20433 should prioritize immediate implementation of Cisco's security advisories and software updates that address the buffer overflow condition in RSVP processing. Network administrators should implement access control measures to limit RSVP traffic to trusted sources, potentially using firewall rules or access control lists to restrict RSVP packet processing. The deployment of network monitoring solutions that can detect anomalous RSVP traffic patterns may provide early warning of potential exploitation attempts. Additionally, implementing redundant network paths and failover mechanisms can help minimize the impact of device reloads on overall network availability. Organizations should also consider disabling RSVP functionality on devices where it is not strictly required, reducing the attack surface for this specific vulnerability. Regular network security assessments and vulnerability scanning should be conducted to identify any potential exposure to similar buffer overflow conditions and ensure comprehensive network protection against evolving threats.