National Cyber-Alert System
Vulnerability Summary for CVE-2008-5555
Original release date:12/12/2008
Last revised:12/24/2008
Source:
US-CERT/NIST
Overview
Microsoft Internet Explorer 8.0 Beta 2 relies on the XDomainRequestAllowed HTTP header to authorize data exchange between domains, which allows remote attackers to bypass the product's XSS Filter protection mechanism, and conduct XSS and cross-domain attacks, by injecting this header after a CRLF sequence, related to "XDomainRequest Allowed Injection (XAI)." NOTE: the vendor has reportedly stated that the XSS Filter intentionally does not attempt to "address every conceivable XSS attack scenario."
Impact
CVSS Severity (version 2.0):
Impact Subscore:
2.9
Exploitability Subscore:
8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable; Victim must voluntarily interact with attack mechanism
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type:Allows unauthorized modification
References to Advisories, Solutions, and Tools
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External Source: XF
Name: ie-xdomainrequestallowed-xss-filter-bypass(47444)
External Source: XF
Name: ie-antixss-xss(47277)
External Source: BUGTRAQ
Name: 20081211 Aspect9: Internet Explorer 8.0 Beta 2 Anti-XSS Filter Vulnerabilities