Sigma Design Z-Wave S0/Z-Wave S1/Z-Wave S2 random values

Summaryinfo

A vulnerability categorized as problematic has been discovered in Sigma Design Z-Wave S0, Z-Wave S1 and Z-Wave S2. This issue affects some unknown processing. The manipulation results in random values. This vulnerability was named CVE-2018-19983. The attack needs to be approached within the local network. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Sigma Design Z-Wave S0, Z-Wave S1 and Z-Wave S2 (affected version unknown). Affected is an unknown functionality. The manipulation with an unknown input leads to a random values vulnerability. CWE is classifying the issue as CWE-330. The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers. This is going to have an impact on availability. CVE summarizes:

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.

The bug was discovered 12/08/2018. The weakness was presented 12/09/2018 (Website). The advisory is available at github.com. This vulnerability is traded as CVE-2018-19983 since 12/09/2018. The exploitability is told to be easy. The attack can only be done within the local network. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1600.001 by the MITRE ATT&CK project.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Sigma Design

Name

• Z-Wave S0
• Z-Wave S1
• Z-Wave S2

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