CVE-2022-45196 in Fabric
Summary
by MITRE • 11/12/2022
Hyperledger Fabric 2.3 allows attackers to cause a denial of service (orderer crash) by repeatedly sending a crafted channel tx with the same Channel name. NOTE: the official Fabric with Raft prevents exploitation via a locking mechanism and a check for names that already exist.
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Analysis
by VulDB Data Team • 12/17/2022
The vulnerability described in CVE-2022-45196 represents a denial of service weakness within Hyperledger Fabric version 2.3 that specifically targets the ordering service components. This issue manifests when attackers repeatedly submit carefully constructed channel transactions containing identical channel names, leading to orderer crashes and subsequent system unavailability. The flaw exploits a fundamental design oversight in the transaction processing logic where the system fails to adequately handle duplicate channel name scenarios, particularly in environments not utilizing the Raft consensus mechanism that includes protective measures.
The technical implementation of this vulnerability stems from insufficient input validation and state management within the channel creation process. When the orderer receives multiple channel transactions with identical names, it fails to properly recognize that a channel with that name already exists, resulting in resource exhaustion and system instability. This behavior creates a condition where the orderer's internal state becomes corrupted through repeated processing of identical transaction requests, ultimately causing the service to terminate unexpectedly. The vulnerability specifically affects systems where the locking mechanism and duplicate name checking are not properly enforced during the transaction validation phase, which is a critical component of the consensus protocol implementation.
From an operational perspective, this vulnerability presents a significant risk to organizations relying on Hyperledger Fabric for enterprise blockchain deployments, particularly those using non-Raft consensus mechanisms. The impact extends beyond simple service disruption to potentially compromise the entire blockchain network's integrity and availability, as orderer nodes are fundamental to maintaining the distributed ledger state. Attackers can leverage this weakness to systematically destabilize network operations through resource exhaustion attacks, making it particularly dangerous in production environments where continuous availability is critical. The vulnerability also exposes potential attack vectors for more sophisticated exploitation attempts that could lead to broader system compromise beyond simple denial of service.
The mitigation strategy for CVE-2022-45196 primarily involves upgrading to Hyperledger Fabric versions that have addressed this specific weakness through enhanced duplicate detection mechanisms and improved locking procedures. Organizations should ensure their deployments utilize Raft consensus mechanisms which inherently provide protection against this particular attack pattern. Additionally, implementing network-level monitoring and anomaly detection systems can help identify suspicious transaction patterns that may indicate attempted exploitation. Security teams should also consider implementing transaction rate limiting and validation controls that can prevent the flooding of identical channel names through the system. This vulnerability aligns with CWE-400 weakness category related to resource exhaustion and falls under ATT&CK technique T1499.004 for network denial of service attacks, emphasizing the need for proper input validation and resource management in distributed ledger systems.