CVE:CVE-2012-4684
CNNVD:CNNVD-201303-266
Bitcoin（比特币）是Bitcoin基金会的一种用开源的P2P软件开发的电子货币、数字货币，是一种网络虚拟货币。
bitcoind和Bitcoin-Qt 0.7.0之前版本中的alert功能中存在漏洞，该漏洞源于程序凭借签名的哈希值从而支持相同签名数据的不同字符表示。通过对循环警报有效的已修改签名，远程攻击者利用该漏洞导致拒绝服务（资源消耗）。
solution:Upgrade bitcoin bitcoin-qt to a higher version than 0.6.3,and avoid the version 0.6.3; Upgrade bitcoin bitcoin_core to a higher version than 0.3.4,0.3.5,0.3.8,0.3.10,0.3.11,0.3.12,0.4.0,0.4.1,0.4.1:rc6,0.4.2,0.4.3,0.4.4,0.4.4:rc2,0.4.5,0.4.6,0.4.7:rc2,0.5.0:rc,0.5.3,0.5.3.1,0.5.4,0.5.5,0.5.6:rc2,0.6.0.1,0.6.0.2,0.6.0.3,0.6.0.4,0.6.0.5,0.6.0.6,0.6.0.7,0.6.0.8,0.6.1,0.6.2,and avoid the version 0.3.4,0.3.5,0.3.8,0.3.10,0.3.11,0.3.12,0.4.0,0.4.1,0.4.1:rc6,0.4.2,0.4.3,0.4.4,0.4.4:rc2,0.4.5,0.4.6,0.4.7:rc2,0.5.0:rc,0.5.3,0.5.3.1,0.5.4,0.5.5,0.5.6:rc2,0.6.0.1,0.6.0.2,0.6.0.3,0.6.0.4,0.6.0.5,0.6.0.6,0.6.0.7,0.6.0.8,0.6.1,0.6.2; Upgrade bitcoin bitcoind to a higher version than 0.6.3,and avoid the version 0.6.3; Upgrade bitcoin wxbitcoin to a higher version than 0.3.4,0.3.5,0.3.8,0.3.10,0.3.11,0.4.0,0.4.1,0.4.1:rc6,0.5.0:rc,and avoid the version 0.3.4,0.3.5,0.3.8,0.3.10,0.3.11,0.4.0,0.4.1,0.4.1:rc6,0.5.0:rc