bin/100442: lukemftpd core dumps on anonymous login
andrew at ugh.net.au
Mon Jul 17 16:00:36 UTC 2006
>Synopsis: lukemftpd core dumps on anonymous login
>Arrival-Date: Mon Jul 17 16:00:34 GMT 2006
>Originator: Andrew Stevenson
>Release: FreeBSD 6.1-RELEASE i386
System: FreeBSD starbug.ugh.net.au 6.1-RELEASE FreeBSD 6.1-RELEASE #0: Mon Jun 12 07:32:23 UTC 2006 root at jail.ugh.net.au:/usr/obj/usr/src/sys/KERNEL1 i386
lukemftpd core dumps on anonymous login after accepting the password. What
seems to be happening is that the user function (ftpd.c:716) is called but we
hit the goto on line 786 and so skip the call to parse_conf on line 821. This
means that when we get to count_users (conf.c:883) (called from pass
(ftpd.c:1149)) curclass.classname is still NULL and the strlcat on line 892 of
conf.c causes a segfault.
The NetBSD code differs in that it doesn't have the goto though I haven't
tested to see if that avoids the problem. I'm not sure of the rationale for
the differing code - the comments seem to say the NetBSD code came from
Added an ftp user and group. Shell set to nologin.
Added lukemftpd to inetd.conf with the flags "ftpd -ll -r -d"
Login via FTP as "ftp" with any password.
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