Microsoft IIS Unicode translation error allows remote command execution
| iis-unicode-translation (5377) |  High Risk |
Description:
Microsoft Internet Information Server (IIS) are vulnerable to a canonicalization error when using foreign Unicode character sets. An attacker could send a specially-crafted URL containing Unicode characters that represent slashes ("/") and backslashes ("\") to access files and folders on the Web server with the privileges of the IUSR_ <machinename>account (an anonymous user account for IIS). This vulnerability may yield additional privileges that could allow the attacker to add, delete, or modify files, or execute commands on the server.
This vulnerability may be exploited using the "Code Blue" worm. See Internet Security Systems Security Alert #96 for more information. See References.
Platforms Affected:
- Microsoft, IIS 4.0
- Microsoft, IIS 5.0
Remedy:
Apply the appropriate patch for your system, as listed in Microsoft Security Bulletin MS00-078 or MS01-041. See References.
For Windows NT 4.0:
Microsoft originally provided a patch for this vulnerability in MS00-078, MS01-041, and MS02-001, but they have been superseded by the Security Roll-up patch released with MS02-018. See References.
For IIS:
Microsoft originally provided a patch for this vulnerability in MS02-018, but it was superseded by the patch released with MS02-062, and then superseded by the patch released with MS03-018. See References.
Consequences:
Gain Access
References:
- BugTraq Mailing List, 2000-10-19 6:21:23, IIS 4.0/5.0 UNICODE exploit at http://marc.theaimsgroup.com/?l=bugtraq&m=97194081906835&w=2.
- BugTraq Mailing List, Fri Feb 15 2002 - 02:34:32 CST, codeblue remote root at http://archives.neohapsis.com/archives/bugtraq/2002-02/0174.html.
- BugTraq Mailing List, Fri Oct 20 2000 - 02:30:48 CDT, [LoWNOISE] addendum %c1%1c IIS 4.0/5.0 Remote command execution at http://archives.neohapsis.com/archives/bugtraq/2000-10/0288.html.
- BugTraq Mailing List, Thu Oct 19 2000 - 05:07:57 CDT, Re: IIS %c1%1c remote command execution at http://archives.neohapsis.com/archives/bugtraq/2000-10/0282.html.
- BugTraq Mailing List, Tue Oct 17 2000 - 09:48:03 CDT, IIS %c1%1c remote command execution at http://archives.neohapsis.com/archives/bugtraq/2000-10/0263.html.
- CERT Advisory CA-2001-11, sadmind/IIS Worm at http://www.cert.org/advisories/CA-2001-11.html.
- CIAC Information Bulletin L-007, Microsoft IIS Folder Traversal at http://www.ciac.org/ciac/bulletins/l-007.shtml.
- Internet Security Systems Security Alert #68, Serious flaw in Microsoft IIS UNICODE translation at http://www.iss.net/xforce/alerts/id/advise68.
- Internet Security Systems Security Alert #96, Code Blue Worm at http://www.iss.net/xforce/alerts/id/advise96.
- Microsoft Security Bulletin MS00-078, Patch Available for 'Web Server Folder Traversal' Vulnerability at http://www.microsoft.com/technet/security/bulletin/ms00-078.mspx.
- Microsoft Security Bulletin MS00-078 FAQ, Microsoft Security Bulletin (MS00-078): Frequently Asked Questions at http://www.microsoft.com/technet/security/bulletin/fq00-078.mspx.
- Microsoft Security Bulletin MS01-041, Malformed RPC Request Can Cause Service Failure at http://www.microsoft.com/technet/security/bulletin/ms01-041.mspx.
- Microsoft Security Bulletin MS02-001, Trusting Domains Do Not Verify Domain Membership of SIDs in Authorization Data at http://www.microsoft.com/technet/security/bulletin/ms02-001.mspx.
- Microsoft Security Bulletin MS02-018, Cumulative Patch for Internet Information Services (Q319733) at http://www.microsoft.com/technet/security/bulletin/ms02-018.mspx.
- Microsoft Security Bulletin MS02-062, Cumulative Patch for Internet Information Service (Q327696) at http://www.microsoft.com/technet/security/Bulletin/MS02-062.mspx.
- Microsoft Security Bulletin MS03-018, Cumulative Patch for Internet Information Service (811114) at http://www.microsoft.com/technet/security/bulletin/ms03-018.mspx.
- BID-1806: Microsoft IIS and PWS Extended Unicode Directory Traversal Vulnerability
- CVE-2000-0884: IIS 4.0 and 5.0 allows remote attackers to read documents outside of the web root, and possibly execute arbitrary commands, via malformed URLs that contain UNICODE encoded characters, aka the Web Server Folder Traversal vulnerability.
- OSVDB ID: 436: Microsoft IIS Unicode Remote Command Execution
- US-CERT VU#111677: Microsoft IIS 4.0 / 5.0 vulnerable to directory traversal via extended unicode in url (MS00-078)
Reported:
Oct 17, 2000
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