https://www.exploit-db.com/exploits/20481
https://www.securityfocus.com/bid/80405
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-199912-153

Microsoft Internet Information Services（IIS）是美国微软（Microsoft）公司的一款适用于Windows Server平台的Web服务器。
Microsoft Internet Information Services 2.0及3.0中存在安全漏洞。远程攻击者通过在URL末尾附加.（点）读取ASP页的源代码。

source: http://www.securityfocus.com/bid/2074/info

Microsoft Internet Information Server (IIS) is a popular web server, providing support for a variety of scripting languages, including ASP (active server pages). IIS 2.0 and 3.0 suffer from an issue allowing a remote user to retrieve the source code for any script (that has read permissions on the server) via a web browser. This is accomplished by appending a period (.) to the end of a URL requesting a specific script, and applies to any file types in the "script-map list", including .asp, .ht., .id, .PL, and others. Consequences of exploitation vary depending on the site design, but commonly include details of directory structure on the web server, database passwords, and various other pieces of information that could then be used to mount further attacks. A Microsoft hotfix for this issue was released, but has been found vulnerable to a variation whereby the period is replaced by %2e, the hexadecimal encoding for the same character. (BugTraq ID 1814). 

http://www.target.host/aspfile.asp.
http://www.target.host/scriptfile.ht.
http://www.target.host/scriptfile.id.
http://www.target.host/scriptfile.PL.

Microsoft IIS 3.0

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Microsoft Windows NT 4.0 SP6a

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Microsoft Windows NT 4.0 SP6a

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Microsoft Windows NT 4.0 SP6

VulnerablesoftwareandversionsConfiguration1OR*cpe:/a:microsoft:internet_information_server:2.0*cpe:/a:microsoft:internet_information_server:3.0*DenotesVulnerableSoftware*ChangesrelatedtovulnerabilityconfigurationsTechnicalDetailsVulnerabilityType(ViewAll)CVEStandardVulnerabilityEntry:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0154