A vulnerability classified as problematic was found in Bitcoin Core and Bitcoin Knots (the affected version is unknown). Affected by this vulnerability is an unknown code of the component Private Key Size Handler. The manipulation as part of a Message leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. The summary by CVE is:

Bitcoin Core before v0.13.0 allows denial of service (memory exhaustion) triggered by the remote network alert system (deprecated since Q1 2016) if an attacker can sign a message with a certain private key that had been known by unintended actors, because of an infinitely sized map. This affects other uses of the codebase, such as Bitcoin Knots before v0.13.0.knots20160814 and many altcoins.

The bug was discovered 07/02/2018. The weakness was shared 07/05/2018 (Website). It is possible to read the advisory at en.bitcoin.it. This vulnerability is known as CVE-2016-10724 since 06/24/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k.

Upgrading eliminates this vulnerability.

The entry 120440 is related to this item.

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• Bitcoin Knots

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