CVE-2018-0309 Denial of service in Cisco Nexus 3000 and 9000 unknown
Authenticated attackers can cause a denial of service on Cisco Nexus switches by exhausting system memory via specific CLI commands or SNMP requests.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-0309?
CVE-2018-0309 is a high-severity denial of service vulnerability in Cisco Nx-Os, published on 21 Jun 2018. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability in the implementation of a specific CLI command and the associated Simple Network Management Protocol (SNMP) MIB for Cisco NX-OS (in standalone NX-OS mode) on Cisco Nexus 3000 and 9000 Series Switches could allow an authenticated, remote attacker to exhaust system memory on an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to the incorrect implementation of the CLI command, resulting in a failure to free all allocated memory upon completion. An attacker could exploit this vulnerability by authenticating to the affected device and repeatedly issuing a specific CLI command or sending a specific SNMP poll request for a specific Object Identifier (OID). A successful exploit could allow the attacker to cause the IP routing process to restart or to cause a device reset, resulting in a DoS condition. Cisco Bug IDs: CSCvf23136.
Weakness: CWE-400
Which versions are affected by CVE-2018-0309?
It affects 1 product.
Products include Cisco Nx-Os.
How do I fix CVE-2018-0309?
No fix has been published for CVE-2018-0309 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2018-0309 being exploited?
There is no known exploitation of CVE-2018-0309 in the wild and no public exploit code.
Other vulnerabilities in Cisco Nx-Os
Sources
Also known as GHSA-57xh-q77w-pfgm.