Resource exhaustion in Cisco NX-OS - CVE-2019-1965
Published: August 30, 2019
Vulnerability identifier: #VU20491
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-1965
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause unexpected system behaviors and crashes.
The vulnerability exists in the Virtual Shell (VSH) session management due to the VSH process not being properly deleted when a remote management connection to the device is disconnected. A remote authenticated attacker can repeatedly perform a remote management connection to the device and terminate the connection in an unexpected manner and cause the VSH processes to fail to delete, which can lead to a system-wide denial of service (DoS) condition.
This vulnerability affects the following products that are running a Cisco NX-OS Software:
- MDS 9000 Series Multilayer Switches
- Nexus 3000 Series Switches
- Nexus 3500 Platform Switches
- Nexus 3600 Platform Switches
- Nexus 5500 Platform Switches
- Nexus 5600 Platform Switches
- Nexus 6000 Series Switches
- Nexus 7000 Series Switches
- Nexus 7700 Series Switches
- Nexus 9000 Series Switches in standalone NX-OS mode
- Nexus 9500 R-Series Switching Platform
- UCS 6200 Series Fabric Interconnects
- UCS 6300 Series Fabric Interconnects
Affected software
Cisco NX-OS
How to mitigate CVE-2019-1965
Install updates from vendor's website.
Cisco NX-OS - addressed in versions 3.2.3k, 4.0.2e, 6.0.2 A8.11, 6.2.22, 6.2.27, 7.0.3 I4.9, 7.0.3 I7.4, 7.1.5 N1.1b, 7.3.4 D1.1, 7.3.5 N1.1, 8.2.3, 8.4.1, 9.2.1, 9.2.3