CVE-2019-1901 Cisco Nexus 9000 Series ACI Mode Switch Software Link Layer Discovery Protocol Buffer Overflow Vulnerability
Adjacent attackers can trigger a buffer overflow in LLDP processing to execute arbitrary code with root privileges or cause denial of service on Cisco Nexus ACI switches.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-1901?
CVE-2019-1901 is a high-severity memory corruption vulnerability in Cisco Nx-Os, published on 31 Jul 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco Nexus 9000 Series Application Centric Infrastructure (ACI) Mode Switch Software could allow an adjacent, unauthenticated attacker to cause a denial of service (DoS) condition or execute arbitrary code with root privileges. The vulnerability is due to improper input validation of certain type, length, value (TLV) fields of the LLDP frame header. An attacker could exploit this vulnerability by sending a crafted LLDP packet to the targeted device. A successful exploit may lead to a buffer overflow condition that could either cause a DoS condition or allow the attacker to execute arbitrary code with root privileges. Note: This vulnerability cannot be exploited by transit traffic through the device; the crafted packet must be targeted to a directly connected interface. This vulnerability affects Cisco Nexus 9000 Series Fabric Switches in ACI mode if they are running a Cisco Nexus 9000 Series ACI Mode Switch Software release prior to 13.2(7f) or any 14.x release.
Weakness: CWE-119
Which versions are affected by CVE-2019-1901?
It affects 1 product.
Products include Cisco Nx-Os.
How do I fix CVE-2019-1901?
No fix has been published for CVE-2019-1901 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2019-1901 being exploited?
There is no known exploitation of CVE-2019-1901 in the wild and no public exploit code.
Other vulnerabilities in Cisco Nx-Os
Sources
Also known as GHSA-vrrp-56vv-xwg7.