Cisco NX-OS 8.2(11)/9.3(9)/10.2(1)/10.2(1q) DHCPv6 Relay Agent null pointer dereference

Summaryinfo

A vulnerability marked as problematic has been reported in Cisco NX-OS 8.2(11)/9.3(9)/10.2(1)/10.2(1q). The affected element is an unknown function of the component DHCPv6 Relay Agent. This manipulation causes null pointer dereference. This vulnerability is tracked as CVE-2024-20446. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Cisco NX-OS 8.2(11)/9.3(9)/10.2(1)/10.2(1q) and classified as critical. Affected by this vulnerability is an unknown code of the component DHCPv6 Relay Agent. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

A vulnerability in the DHCPv6 relay agent of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of specific fields in a DHCPv6 RELAY-REPLY message. An attacker could exploit this vulnerability by sending a crafted DHCPv6 packet to any IPv6 address that is configured on an affected device. A successful exploit could allow the attacker to cause the dhcp_snoop process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition.

It is possible to read the advisory at sec.cloudapps.cisco.com. This vulnerability is known as CVE-2024-20446 since 11/08/2023. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/29/2024).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• NX-OS

Version

• 8.2(11)
• 9.3(9)
• 10.2(1)
• 10.2(1q)

License

• commercial

Website

• Vendor: https://www.cisco.com/

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