Description
A vulnerability in the segment routing feature for the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to insufficient input validation of ingress IS-IS packets. An attacker could exploit this vulnerability by sending specific IS-IS packets to an affected device after forming an adjacency. A successful exploit could allow the attacker to cause the IS-IS process on all affected devices that are participating in the Flexible Algorithm to crash and restart, resulting in a DoS condition.
Note: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2-adjacent to the affected device and must have formed an adjacency. This vulnerability affects segment routing for IS-IS over IPv4 and IPv6 control planes as well as devices that are configured as level 1, level 2, or multi-level routing IS-IS type.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Cisco | Cisco IOS XR Software | 7.4.1, 6.8.1, 7.4.15, 7.5.1, 7.4.16, 7.6.1, 7.5.2, 7.8.1, 7.6.15, 7.5.12, 7.7.1, 6.8.2, 7.4.2, 6.9.1, 7.6.2, 7.5.3, 7.7.2, 6.9.2, 7.9.1, 7.10.1, 7.8.2, 7.5.4, 7.8.22, 7.7.21, 7.9.2, 7.5.5, 7.11.1, 7.9.21, 7.10.2, 7.6.3 | — |
Advisories 2
- NCSC-2024-0371 Kwetsbaarheden verholpen in Cisco IOS XR NCSC-NL (Netherlands) · Sep 13, 2024
- WID-SEC-2024-2125 Cisco IOS XR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 11, 2024