CVE-2022-20846
Vulnérabilité moyenne dans Cisco IOS XR Software (Cisco)
Description
A vulnerability in the Cisco Discovery Protocol implementation for Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause the Cisco Discovery Protocol process to reload on an affected device. This vulnerability is due to a heap buffer overflow in certain Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to cause a heap overflow, which could cause the Cisco Discovery Protocol process to reload on the device. The bytes that can be written in the buffer overflow are restricted, which limits remote code execution.Note: Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent). Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is part of the September 2022 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see .
Gravité et risque d'exploitation
CVE-2022-20846 obtient un score CVSS de 4.3/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 1.00 %, ce qui la place devant 62.2 % des CVE référencées.
Que faire ?
- Vérifiez si Cisco IOS XR Software (versions 7.0.2, 7.2.1, 7.2.2, 6.5.31, 6.5.32, 7.3.4, 6.9.1, 7.0.14, 6.6.2, 7.5.12, 7.4.2, 6.5.29, 7.1.25, 7.0.1, 7.3.3, 6.6.11, 6.6.1, 7.3.27, 6.7.3, 6.8.1, 6.5.1, 7.0.90, 6.5.3, 6.6.3, 7.4.15, 7.4.16, 6.7.1, 6.8.2, 7.1.15, 6.5.90, 6.6.4, 6.5.15, 6.5.25, 7.5.2, 7.4.1, 7.3.15, 7.6.15, 7.1.2, 7.0.0, 7.0.11, 6.7.4, 7.2.0, 7.2.12, 6.5.26, 6.7.2, 6.6.25, 7.3.16, 7.0.12, 6.5.92, 6.5.93, 7.1.3, 7.3.2, 6.5.28, 7.3.1, 6.5.2, 6.7.35, 7.5.1, 6.6.12, 7.6.1, 7.1.1) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.
Références
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xr-cdp-wnALzvT2
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-bng-Gmg5Gxt
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ncs4k-tl1-GNnLwC6
