There is a security problem in all versions prior to 2.6.1 that affects only people running a read/write daemon WITHOUT using chroot. If the user privs that such an rsync daemon is using is anything above "nobody", you are at risk of someone crafting an attack that could write a file outside of the module's "path" setting (where all its files should be stored). Please either enable chroot or upgrade to 2.6.1. People not running a daemon, running a read-only daemon, or running a chrooted daemon are totally unaffected. Affects: 2.1AS 2.1AW 2.1ES 2.1WS [#122511] Affects: 3AS 3ES 3WS 3Desktop [#122511] Affects: FC1 Public: http://rsync.samba.org/#security_apr04
Note that this has been in testing for a few weeks: http://download.fedora.redhat.com/pub/fedora/linux/core/updates/testing/1/i386/rsync-2.5.7-5.fc1.i386.rpm
This silently made it out of testing. I just mailed the announcement. Closing ticket.