Short Name |
HTTP:REQERR:REQ-MALFORMED-URL |
---|---|
Severity |
Minor |
Recommended |
No |
Category |
HTTP |
Keywords |
sans top20 unicode microsoft IIS |
Release Date |
2003/08/27 |
Update Number |
1213 |
Supported Platforms |
di-5.3+, idp-4.0+, isg-3.0+, j-series-9.5+, mx-11.4+, srx-12.1+, srx-branch-12.1+, vmx-17.4+, vsrx-12.1+, vsrx3bsd-18.2+ |
This protocol anomaly triggers when it detects a malformed URL, such as a Unicode encoded field with non-hex digits or an encoded NULL byte.
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.