Bitcoin-Qt version 0.8.4 is now available from: http://sourceforge.net/projects/bitcoin/files/Bitcoin/bitcoin-0.8.4/
This is a maintenance release to fix a critical bug and three security issues; we urge all users to upgrade.
Please report bugs using the issue tracker at github: https://github.com/bitcoin/bitcoin/issues
How to Upgrade
If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), then run the installer (on Windows) or just copy over /Applications/Bitcoin-Qt (on Mac) or bitcoind/bitcoin-qt (on Linux).
If you are upgrading from version 0.7.2 or earlier, the first time you run 0.8.4 your blockchain files will be re-indexed, which will take anywhere from 30 minutes to several hours, depending on the speed of your machine.
0.8.4 Release notes
An attacker could send a series of messages that resulted in an integer division-by-zero error in the Bloom Filter handling code, causing the Bitcoin-Qt or bitcoind process to crash. Bloom filters were introduced with version 0.8, so versions 0.8.0 through 0.8.3 are vulnerable to this critical denial-of-service attack.
A constant-time algorithm is now used to check RPC password guess attempts; fixes https://github.com/bitcoin/bitcoin/issues/2838 (CVE-2013-4165)
Implement a better fix for the fill-memory-with-orphan-transactions attack that was fixed in 0.8.3. See https://bitslog.wordpress.com/2013/07/18/buggy-cve-2013-4627-patch-open-new-vectors-of-attack/ for a description of the weaknesses of the previous fix. (CVE-2013-4627)
Fix multi-block reorg transaction resurrection.
Fix non-standard disconnected transactions causing mempool orphans. This bug could cause nodes running with the -debug flag to crash.
OSX: use 'FD_FULLSYNC' with LevelDB, which will (hopefully!) prevent the database corruption issues many people have experienced on OSX.
Linux: clicking on bitcoin: links was broken if you were using a Gnome-based desktop.
Fix a hang-at-shutdown bug that only affects users that compile their own version of Bitcoin against Boost versions 1.50-1.52.
Checkpoint at block 250,000 to speed up initial block downloads and make the progress indicator when downloading more accurate.
Thanks to everybody who contributed to the 0.8.4 releases!
- Pieter Wuille
- Warren Togami
- Patrick Strateman
- Gregory Maxwell
- Sergio Demian Lerner
- Cory Fields
- Matt Corallo
- Gavin Andresen