HTTP: Too Long UTF8 Code

This protocol anomaly triggers when it detects an HTTP request with an exceedingly long UTF8 codes. This can be an attempt to overflow a portion of the Web server, or that a script is being made available to the Web server.

Extended Description

Microsoft IIS 4.0 and 5.0 are both vulnerable to double dot "../" directory traversal exploitation if extended UNICODE character representations are used in substitution for "/" and "\". Unauthenticated users may access any known file in the context of the IUSR_machinename account. The IUSR_machinename account is a member of the Everyone and Users groups by default, therefore, any file on the same logical drive as any web-accessible file that is accessible to these groups can be deleted, modified, or executed. Successful exploitation would yield the same privileges as a user who could successfully log onto the system to a remote user possessing no credentials whatsoever. It has been discovered that a Windows 98 host running Microsoft Personal Web Server is also subject to this vulnerability. (March 18, 2001) This is the vulnerability exploited by the Code Blue Worm. **UPDATE**: It is believed that an aggressive worm may be in the wild that actively exploits this vulnerability.

Affected Products

Microsoft iis

References

BugTraq: 1806

CVE: CVE-2000-0884

URL: ftp://ftp.rfc-editor.org/in-notes/rfc3629.txt

Short Name

HTTP:AUDIT:REQ-LONG-UTF8CODE

Severity

Info

Recommended

False

Recommended Action

None

HTTP: Too Long UTF8 Code

Extended Description

Affected Products

References

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