Title: Microsoft IIS 3.0/4.0 Upgrade BDIR.HTR Vulnerability
Severity: MODERATE
Description:
Microsoft Internet Information Server (IIS) 3.0 came with a series of remote administration scripts installed in /scripts/iisadmin off the web root directory. ism.dll is required for processing these scripts, and version 3.0 of IIS came with an ism.dll containing an authentication scheme to prevent unauthorized access. If an IIS 3.0 installation is upgraded to IIS 4.0 without removing these scripts, they can be accessed remotely without authentication due to changes in the authentication methods used by IIS 4.0. One of these scripts, bdir.htr, still functions under the IIS 4.0 server - and can be used by a remote attacker to obtain information about the server's directory structure. The script displays a directory listing of a directory specified as part of a request - but only directory names are displayed. Although privilege elevation cannot be accomplished directly by exploiting this script, the information about the server's directory structure thus obtained could potentially be used in mounting further attacks.
Affected Products:
- Cisco Building Broadband Service Manager 5.0.0
- Cisco Call Manager 1.0.0
- Cisco Call Manager 2.0.0
- Cisco Call Manager 3.0.0
- Cisco ICS 7750 0.0.0
- Cisco IP/VC 3540 Video Rate Matching Module 0.0.0
- Cisco Unity Server 2.0.0
- Cisco Unity Server 2.2.0
- Cisco Unity Server 2.3.0
- Cisco Unity Server 2.4.0
- Cisco uOne 1.0.0
- Cisco uOne 2.0.0
- Cisco uOne 3.0.0
- Cisco uOne 4.0.0
- Microsoft BackOffice 4.0.0
- Microsoft BackOffice 4.5.0
- Microsoft IIS 3.0.0
- Microsoft IIS 4.0.0
- Microsoft Windows NT 4.0 Option Pack
References:
- Phrack: Phrack Magazine Volume 8, Issue 54 Dec 25th, 1998, article 08 of 12
- Richard Puckett: Comprehensive Windows NT Security
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