What version of vsftpd contained the smiley face backdoor?

Chris Evans, author of vsftpd announced that the master site for vsftpd was compromised and that the latest version of vsftpd (vsftpd-2.3.4.tar.gz) was backdoored. The backdoor payload is interesting. In response to a smiley face in the FTP username, a TCP callback shell is attempted. There is no obfuscation.

Explanation:

answer: internal fragmentation is the difference between the (fixed) size of a memory hole and the data within in that memory. for example, if a 1,024 byte block of memory holds 800 bytes of data, then the 224 bytes difference is considered lost to internal fragmentation.

external fragmentation occurs when the sum of memory fragments is large enough to satisfy a request, but the holes are non-contiguous and the request cannot be satisfied. this can occur when memory is dynamically allocated and freed.

explanation: