A vulnerability was found in cpp-ethereum JSON-RPC (version now known). It has been declared as critical. Affected by this vulnerability is some unknown processing of the component miner_setGasPrice API. The manipulation as part of a JSON Request leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An exploitable improper authorization vulnerability exists in miner_setGasPrice API of cpp-ethereum's JSON-RPC (commit 4e1015743b95821849d001618a7ce82c7c073768). A JSON request can cause an access to the restricted functionality resulting in authorization bypass. An attacker can send JSON to trigger this vulnerability.

The bug was discovered 01/09/2018. The weakness was disclosed 01/19/2018 by Cisco with Cisco Talos (Website). The advisory is shared at securityfocus.com. This vulnerability is known as CVE-2017-12116 since 07/31/2017. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 10 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.

The entries 112233, 112234, 112235 and 112236 are pretty similar.

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• cpp-ethereum

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• JSON-RPC

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