CDPwn: Cisco Discovery Protocol Vulnerabilities Disclosed by Researchers
Researchers find several flaws in a proprietary protocol used by many Cisco devices.
Contexte
On February 5, researchers at Armis Security announced their discovery of five vulnerabilities in the Cisco Discovery Protocol, a proprietary protocol designed to allow for discovery and communication between Cisco devices.
Analyse
CDPwn is a series of vulnerabilities in Cisco Discovery Protocol due to improper validation of Cisco Discovery Protocol messages. By sending a specially crafted packet to a vulnerable device, an unauthenticated, adjacent attacker could achieve remote code execution or create a denial of service condition.
Cisco notes in their advisories that because Cisco Discovery Protocol is a Layer 2 protocol, an attacker “must be in the same broadcast domain as the affected device.”
The following are the five vulnerabilities disclosed by Armis:
| CVE | Fonction | CVSSv3 |
|---|---|---|
| CVE-2020-3110 | Cisco Video Surveillance 8000 Series IP Cameras Cisco Discovery Protocol Remote Code Execution and Denial of Service Vulnerability | 8.8 |
| CVE-2020-3111 | Cisco IP Phone Remote Code Execution and Denial of Service Vulnerability | 8.8 |
| CVE-2020-3118 | Cisco IOS XR Software Cisco Discovery Protocol Format String Vulnerability | 8.8 |
| CVE-2020-3119 | Cisco NX-OS Software Cisco Discovery Protocol Remote Code Execution Vulnerability | 8.8 |
| CVE-2020-3120 | Cisco FXOS, IOS XR, and NX-OS Software Cisco Discovery Protocol Denial of Service Vulnerability | 7.4 |
According to Armis, these vulnerabilities “affect tens of million devices” including Cisco NX-OS switches, Cisco IOS XR routers, Cisco NCS Systems, Cisco 8000 IP Cameras, Cisco Firepower Firewalls, and Cisco IP Phone 7800 and 8800 Series.
Exploitation requires the Cisco Discovery Protocol to be enabled and Cisco notes that it is enabled by default on certain devices using NX-OS and FXOS, though it is not enabled by default on routers using Cisco IOS XR.
Démonstration de faisabilité (PoC)
At the time this blog post was published, there was no proof-of-concept code for any of the CDPwn vulnerabilities disclosed by Armis.
Solution
Cisco has released software updates to address these vulnerabilities. They’ve identified a list of vulnerable and not vulnerable products. The list below contains links to the respective section of each advisory that identifies vulnerable products.
Identification des systèmes affectés
A list of Tenable plugins to identify these vulnerabilities will appear here as they’re released.
Où trouver plus d'informations
Rejoignez l'équipe SRT de Tenable sur Tenable Community.
Apprenez-en plus sur Tenable, la première plateforme de Cyber Exposure qui vous permet de gérer votre surface d'attaque moderne de manière globale.
Profitez d'un essai gratuit de 30 jours de Tenable.io Vulnerability Management.
Articles connexes
Cybersecurity Snapshot: 6 Things That Matter Right Now
August 5, 2022Topics that are top of mind for the week ending Aug. 5 | Don’t take your eye off the Log4j ball. The dangers of unsupported software. Why low MFA adoption is everyone’s problem. Preventing ransomware attacks. And much more!
Analyzing the Vulnerabilities Associated with the Top Malware Strains of 2021
August 4, 2022International cybersecurity agencies issue a joint alert outlining the top malware strains of 2021. We identified vulnerabilities associated with these strains.
CVE-2022-31656: VMware Patches Several Vulnerabilities in Multiple Products (VMSA-2022-0021)
August 2, 2022VMware has patched another set of serious vulnerabilities across multiple products including VMware Workspace ONE Access. Organizations should patch urgently given past activity targeting vulnerabilities in VMware products.
Cybersecurity Snapshot: 6 Things That Matter Right Now
August 5, 2022Topics that are top of mind for the week ending Aug. 5 | Don’t take your eye off the Log4j ball. The dangers of unsupported software. Why low MFA adoption is everyone’s problem. Preventing ransomware attacks. And much more!
Analyzing the Vulnerabilities Associated with the Top Malware Strains of 2021
August 4, 2022International cybersecurity agencies issue a joint alert outlining the top malware strains of 2021. We identified vulnerabilities associated with these strains.
CVE-2022-31656: VMware Patches Several Vulnerabilities in Multiple Products (VMSA-2022-0021)
August 2, 2022VMware has patched another set of serious vulnerabilities across multiple products including VMware Workspace ONE Access. Organizations should patch urgently given past activity targeting vulnerabilities in VMware products.
- Gestion des vulnérabilités
