Web site XSS using BOM on UTF-8 pages — Mozilla

2006-06-0100:00:00

Mozilla Foundation

www.mozilla.org

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:N/I:P/A:N

EPSS

0.141

Percentile

95.7%

JSON

Masatoshi Kimura reports that the Unicode Byte-order-Mark (BOM) is stripped from UTF-8 pages during the conversion to Unicode before the parser sees the web page. As a result the parser will see and process script tags that web input sanitizers may miss because they appear as “scr[BOM]ipt” or similar in the comment code on the web site.

Affected configurations

Vulners

Node

mozillafirefoxRange<1.5.0.4

mozillaseamonkeyRange<1.0.2

mozillathunderbirdRange<1.5.0.4

VendorProductVersionCPE
mozillafirefox*cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozillaseamonkey*cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
mozillathunderbird*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
mozilla	firefox	*	cpe:2.3:a:mozilla:firefox::::::::
mozilla	seamonkey	*	cpe:2.3:a:mozilla:seamonkey::::::::
mozilla	thunderbird	*	cpe:2.3:a:mozilla:thunderbird::::::::