CVE-2014-4503 in cgminer
Summary
by MITRE
The parse_notify function in util.c in sgminer before 4.2.2 and cgminer 3.3.0 through 4.0.1 allows man-in-the-middle attackers to cause a denial of service (application exit) via a crafted (1) bbversion, (2) prev_hash, (3) nbit, or (4) ntime parameter in a mining.notify action stratum message.
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Analysis
by VulDB Data Team • 03/26/2022
The vulnerability identified as CVE-2014-4503 represents a critical denial of service flaw affecting mining software implementations in the cryptocurrency mining ecosystem. This issue resides within the parse_notify function located in the util.c file of both sgminer and cgminer software packages, which are widely utilized mining clients for bitcoin and other cryptocurrencies. The vulnerability specifically targets the stratum protocol implementation that enables communication between mining pools and mining hardware, making it a significant concern for mining operations that rely on these protocols for network coordination and job distribution.
The technical flaw manifests through improper input validation within the mining software's notification parsing mechanism. Attackers can exploit this weakness by crafting malicious stratum messages containing specially formatted parameters including bbversion, prev_hash, nbit, or ntime fields within mining.notify actions. These parameters are normally used to convey block header information and mining job details from mining pools to client software. When the vulnerable parsing function encounters these crafted parameters, it fails to properly handle the malformed input, leading to application termination or crash. This behavior constitutes a classic denial of service condition that can be triggered remotely without requiring authentication or privileged access.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise entire mining operations and network stability. Mining pools that serve multiple clients could experience cascading failures if attackers target specific mining software versions, leading to temporary or prolonged mining downtime. The vulnerability affects a broad range of mining software versions including sgminer before 4.2.2 and cgminer versions 3.3.0 through 4.0.1, representing a substantial portion of the mining ecosystem at the time of discovery. This widespread impact makes it particularly dangerous as attackers could target multiple mining clients simultaneously, amplifying the potential damage to mining networks and pool operations.
Security researchers have classified this vulnerability according to CWE-20, which represents "Improper Input Validation" as the underlying weakness. The attack pattern aligns with techniques described in the MITRE ATT&CK framework under the T1499 category for "Network Denial of Service" and T1566 for "Phishing with Social Engineering". The vulnerability demonstrates how network protocols can be exploited through subtle input manipulation to cause application-level failures, representing a common attack vector in distributed computing environments. Organizations should implement immediate mitigation strategies including software updates to patched versions, network monitoring for suspicious stratum traffic patterns, and consideration of network segmentation to limit the impact of potential attacks. The vulnerability also highlights the importance of proper input validation in network protocols and demonstrates how seemingly minor parsing errors can lead to significant operational disruptions in mining infrastructure.