Quick answers
- Is CVE-1999-0253 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-1999-0253 being exploited in the wild.
- How severe is CVE-1999-0253?
- High severity, with a CVSS score of 7.5, published 1 January 1997.
- Which products and versions are affected?
- Microsoft Internet Information Services 3.0 with iis-fix hotfix.
- Is there a fix for CVE-1999-0253?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-1999-0253 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-1999-0253?
- Check whether you run Microsoft Internet Information Services at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A vulnerability in Microsoft IIS 3.0, specifically when the 'iis-fix' hotfix is applied, allows for source code disclosure of Active Server Pages (ASP). The issue is caused by improper handling of URL-encoded characters; by replacing the dot (.) in a file extension with its hex-encoded equivalent (%2e), the server fails to execute the script and instead serves the raw source code to the requester. This is a remote, unauthenticated attack that can be performed via a standard web browser. Attackers can leverage this to extract sensitive information such as hardcoded credentials or application logic from the server.
Affected products
- Microsoft Internet Information Services (IIS) 3.0 with iis-fix hotfix
Timeline
- 1997-01-01: disclosed: Initial publication date