Title: Microsoft Internet Explorer Invalid Byte Cross-Frame Access Vulnerability
Severity: HIGH
Description:
On January 28, 1999, Georgi Guninski originally reported a vulnerability in Internet Explorer 4.x. Internet Explorer 4.x's implentation of Cross-frame security could be bypassed if "%01" is appended to an arbitrary URL. If the specially malformed URL is inserted in a javascript after an 'about:' statement, arbitrary code can be executed on the target host. Successful exploitation could lead to access to local files, window spoofing, and arbitrary code execution.
On October 6, 2000, Alp Sinan discovered that a variation of this vulnerability exists in Microsoft Internet Explorer 5.5. Instead of using "%01", the ASCII equivalents of "^A" or "&#01" can be used instead.
Affected Products:
- Microsoft Internet Explorer 4.0
- Microsoft Internet Explorer 4.0 for Windows 95
- Microsoft Internet Explorer 4.0 for Windows NT 4.0
- Microsoft Internet Explorer 5.0 for Windows 95
- Microsoft Internet Explorer 5.0 for Windows 98
- Microsoft Internet Explorer 5.0 for Windows NT 4.0
- Microsoft Internet Explorer 5.0.1
- Microsoft Internet Explorer 5.5
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows ME
- Microsoft Windows NT 4.0
References:
- Georgi Guninski: Javascript %01 bug in Internet Explorer
- NTBugtraq: IE Cross-frame vulnerabilities - %01 bug again.
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