Microsoft IIS User Existence Disclosure Vulnerability

Bugtraq ID:	7492
Class:	Design Error
CVE:
Remote:	Yes
Local:	No
Published:	Feb 24 1999 12:00AM
Updated:	Feb 24 1999 12:00AM
Credit:	Discovery of this issue credited to mnemonix <[email protected]>.
Vulnerable:	Microsoft IIS 5.1 - Microsoft Windows 2000 Advanced Server SP2 - Microsoft Windows 2000 Advanced Server SP1 - Microsoft Windows 2000 Advanced Server - Microsoft Windows 2000 Datacenter Server SP2 - Microsoft Windows 2000 Datacenter Server SP1 - Microsoft Windows 2000 Datacenter Server - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional - Microsoft Windows 2000 Server SP2 - Microsoft Windows 2000 Server SP1 - Microsoft Windows 2000 Server + Microsoft Windows XP 64-bit Edition SP1 + Microsoft Windows XP 64-bit Edition + Microsoft Windows XP 64-bit Edition - Microsoft Windows XP Home SP1 - Microsoft Windows XP Home SP1 - Microsoft Windows XP Home - Microsoft Windows XP Home + Microsoft Windows XP Professional SP1 + Microsoft Windows XP Professional SP1 + Microsoft Windows XP Professional + Microsoft Windows XP Professional Microsoft IIS 5.0 - Microsoft Windows 2000 Advanced Server SP2 - Microsoft Windows 2000 Advanced Server SP2 - Microsoft Windows 2000 Advanced Server SP1 - Microsoft Windows 2000 Advanced Server SP1 + Microsoft Windows 2000 Advanced Server + Microsoft Windows 2000 Advanced Server - Microsoft Windows 2000 Datacenter Server SP2 - Microsoft Windows 2000 Datacenter Server SP2 - Microsoft Windows 2000 Datacenter Server SP1 - Microsoft Windows 2000 Datacenter Server SP1 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP2 - Microsoft Windows 2000 Professional SP1 - Microsoft Windows 2000 Professional SP1 + Microsoft Windows 2000 Professional + Microsoft Windows 2000 Professional - Microsoft Windows 2000 Server SP2 - Microsoft Windows 2000 Server SP2 - Microsoft Windows 2000 Server SP1 - Microsoft Windows 2000 Server SP1 + Microsoft Windows 2000 Server + Microsoft Windows 2000 Server Microsoft IIS 4.0 alpha - Microsoft Windows NT 4.0 alpha - Microsoft Windows NT 4.0 alpha 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 User Existence Disclosure Vulnerability

Microsoft IIS is prone to an issue where the existence of users may be revealed to remote attackers. The vulnerability exists when users attempt to authenticate against a vulnerable system.

IIS will generate an error page if authentication fails. Different messages are generated depending on whether the user exists or not.

Microsoft IIS User Existence Disclosure Vulnerability

The following proof of concepts have been provided:

• /data/vulnerabilities/exploits/ms-iis-bruteforce.pl
• /data/vulnerabilities/exploits/ms-iis-disc.pl

Microsoft IIS User Existence Disclosure 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]>.

Microsoft IIS User Existence Disclosure Vulnerability

References:

• Microsoft IIS Authentication Manager Account Conformation Vuln? (JeiAr )
  
• RE: Microsoft IIS Authentication Manager Account Conformation Vuln? ("Russ" )