CVE-2018-19983 Denial of service in n/a
Attackers can cause denial of service on Z-Wave S0 devices by flooding them with split Nonce Get frames, disrupting secure communication.
- 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-2018-19983?
CVE-2018-19983 is a medium-severity denial of service vulnerability in n/a, published on 9 Dec 2018. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered on Sigma Design Z-Wave S0 through S2 devices. An attacker first prepares a Z-Wave frame-transmission program (e.g., Z-Wave PC Controller, OpenZWave, CC1110, etc.). Next, the attacker conducts a DoS attack against the Z-Wave S0 Security version product by continuously sending divided "Nonce Get (0x98 0x81)" frames. The reason for dividing the "Nonce Get" frame is that, in security version S0, when a node receives a "Nonce Get" frame, the node produces a random new nonce and sends it to the Src node of the received "Nonce Get" frame. After the nonce value is generated and transmitted, the node transitions to wait mode. At this time, when "Nonce Get" is received again, the node discards the previous nonce value and generates a random nonce again. Therefore, because the frame is encrypted with previous nonce value, the received normal frame cannot be decrypted.
Weakness: CWE-330
Which versions are affected by CVE-2018-19983?
It affects 2 products.
Products include Silabs Z-Wave S0 Firmware, Silabs Z-Wave S2 Firmware.
How do I fix CVE-2018-19983?
No fix has been published for CVE-2018-19983 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-2018-19983 being exploited?
There is no known exploitation of CVE-2018-19983 in the wild and no public exploit code.
Sources
Also known as GHSA-p576-c9v5-5pvc.