HTTP: IIS ASP Search Probe
This signature detects requests for the bdir.htr script that can be used to view directory structure information on the server.
Extended 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.
References
BugTraq: 2280
Short Name
HTTP:IIS:ASP-SEARCH-PROBE
Severity
Warning
Recommended
False
Recommended Action
None
Category
HTTP
Keywords
ASP IIS Probe Search bid:2280
Release Date
04/22/2003
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3375
False Positive
Unknown