Microsoft Internet Explorer ASCII encoded Web filter bypass
| ie-ascii-encoded-web-filter-bypass (27288) |  Medium Risk |
Description:
Microsoft Internet Explorer could allow malicious JavaScript to bypass certain Web filter applications, caused by improper validation of ASCII encoded Web pages. A remote attacker could exploit this vulnerability by persuading a potential victim to visit a specially-crafted ASCII-encoded Web page, which could allow the attacker to bypass Web filtering applications and possibly execute malicious JavaScript on the victim's system.
Consequences:
Bypass Security
Remedy:
No remedy available as of August 28, 2010.
References:
- BugTraq Mailing List, Wed Jun 21 2006 - 08:11:18 CDT: Bypassing of web filters by using ASCII.
- CVE-2006-3227: Interpretation conflict between Internet Explorer and other web browsers such as Mozilla, Opera, and Firefox might allow remote attackers to modify the visual presentation of web pages and possibly bypass protection mechanisms such as content filters via ASCII characters with the 8th bit set, which could be stripped by Internet Explorer to render legible text, but not when using other browsers. NOTE: there has been significant discussion about this issue, and as of 20060625, it is not clear where the responsibility for this issue lies, although it might be due to vagueness within the associated standards. NOTE: this might only be exploitable with certain encodings.
- OSVDB ID: 28376: Microsoft IE US-ASCII Character Set Filter Bypass XSS
Platforms Affected:
- Microsoft Internet Explorer 6
Reported:
Jun 20, 2006
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.
For corrections or additions please email xforce@iss.net