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61 lines
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61 lines
2 KiB
HTML
---
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title: "CVE-2012-2459: Critical Vulnerability (denial-of-service)"
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lastmod: "Mon May 14 17:00:00 UTC 2012"
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alias: "dos"
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active: false
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---
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<h2>Risks</h2>
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<p>
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A denial-of-service vulnerability that affects all versions of
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bitcoind and Bitcoin-Qt has been reported and fixed. An attacker
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could isolate a victim's node and cause the creation of blockchain
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forks.
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</p>
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<h2>Solutions</h2>
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<p>
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Because this bug could be exploited to severely disrupt the Bitcoin
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network we consider this a critical vulnerability, and encourage
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everybody to upgrade to <a href="https://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.6.2/">the latest version: 0.6.2</a>.
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</p>
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<p>
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<a href="https://bitcointalk.org/?topic=79651">Backports for older releases (0.5.5 and 0.4.6) are also available</a> if
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you cannot upgrade to version 0.6.2.
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</p>
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<h2>Technical Details</h2>
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<p>
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Full technical details are being withheld to give people the
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opportunity to upgrade.
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</p>
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<p>
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Thanks to <a href="http://forre.st/">Forrest Voight</a> for discovering and reporting the vulnerability.
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</p>
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<h2>Questions & Answers</h2>
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<h3>
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How would I know if I am the victim of this attack?
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</h3>
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<p>
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Your bitcoin process would stop processing blocks and would have a
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different block count from the rest of the network (you can see the
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current block count at websites like <a href="http://blockexplorer.com/">blockexplorer.com</a> or
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<a href="http://blockchain.info/">blockchain.info</a>). Eventually it would display the message:
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</p>
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<blockquote>WARNING: Displayed transactions may not be correct! You may need to
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upgrade, or other nodes may need to upgrade.</blockquote>
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<p>
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(note that this message is displayed whenever your bitcoin process
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detects that the rest of the network seems to have a different
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block count, which can happen for several reasons unrelated to
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this vulnerability).
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</p>
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<h3>
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Could this bug be used to steal my wallet?
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</h3>
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<p>
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No.
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</p>
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<h3>
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Could this bug be used to install malware on my system?
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</h3>
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<p>
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No.
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</p>
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