Doubled Character XSS Manipulations |
Weakness ID: 85 (Weakness Variant) | Status: Draft |
Description Summary
Reference | Description |
---|---|
CVE-2002-2086 | XSS using "<script". |
CVE-2000-0116 | Encoded "javascript" in IMG tag. |
CVE-2001-1157 | Extra "<" in front of SCRIPT tag. |
Resolve all filtered input to absolute or canonical representations before processing. |
Carefully check each input parameter against a rigorous positive specification (white list) defining the specific characters and format allowed. All input should be sanitized, not just parameters that the user is supposed to specify, but all data in the request, including tag attributes, hidden fields, cookies, headers, the URL itself, and so forth. A common mistake that leads to continuing XSS vulnerabilities is to validate only fields that are expected to be redisplayed by the site. We often encounter data from the request that is reflected by the application server or the application that the development team did not anticipate. Also, a field that is not currently reflected may be used by a future developer. Therefore, validating ALL parts of the HTTP request is recommended. |
This involves "HTML Entity Encoding" all non-alphanumeric characters from data that was received from the user and is now being written to the request. |
With Struts, you should write all data from form beans with the bean's filter attribute set to true. |
Additionally, to help mitigate XSS attacks against the user's session cookie, set the session cookie to be HttpOnly. In browsers that support the HttpOnly feature (such as Internet Explorer), this attribute prevents the user's session cookie from being accessed by client-side scripts, including scripts inserted due to a XSS attack. |
Ordinality | Description |
---|---|
Primary | (where the weakness exists independent of other weaknesses) |
Nature | Type | ID | Name | View(s) this relationship pertains to |
---|---|---|---|---|
ChildOf | Weakness Base | 79 | Failure to Preserve Web Page Structure ('Cross-site Scripting') | Development Concepts (primary)699 Research Concepts (primary)1000 |
PeerOf | Weakness Class | 675 | Duplicate Operations on Resource | Research Concepts1000 |
Mapped Taxonomy Name | Node ID | Fit | Mapped Node Name |
---|---|---|---|
PLOVER | DOUBLE - Doubled character XSS manipulations, e.g. "<script" |
CAPEC-ID | Attack Pattern Name | (CAPEC Version: 1.4) |
---|---|---|
32 | Embedding Scripts in HTTP Query Strings |
Submissions | ||||
---|---|---|---|---|
Submission Date | Submitter | Organization | Source | |
PLOVER | Externally Mined | |||
Modifications | ||||
Modification Date | Modifier | Organization | Source | |
2008-07-01 | Eric Dalci | Cigital | External | |
updated Time of Introduction | ||||
2008-09-08 | CWE Content Team | MITRE | Internal | |
updated Relationships, Taxonomy Mappings, Weakness Ordinalities |