CVE-2014-6251 : Stack Overflow in CPUMiner When Submitting Upstream Work

[Mick Ayzenberg <mick () dejavusecurity com>]

Vulnerability title: Stack Overflow in CPUMiner When Submitting Upstream
Work
CVE: CVE-2014-6251
Affected version: CPUMiner before 2.4.1
Reported by: Mick Ayzenberg of Deja vu Security

Details:

A malicious pool or an attacker who is in the middle of a valid
stratum connection can respond to a 'mining.subscribe' and instruct a
miner to use a large nonce2 length.

The attacker can then instruct the miner to generate blocks with a
standard 'mining.notify' request. Once the miner has discovered a
valid block it will attempt to copy this large nonce into a fixed size
character array and overflow into stack memory.

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