Top 10-2017 A4-XML External Entities (XXE) - Revision history

T.Gigler: Editorial changes e.g. line feeds, added a link

2018-01-01T16:35:27Z

Editorial changes e.g. line feeds, added a link

T.Gigler: Prepare OWASP Top 10-2017 Release (Content)

2017-12-15T21:56:46Z

Prepare OWASP Top 10-2017 Release (Content)

T.Gigler: Updated Navigation (incl PrevLink and NextLink)

2017-12-12T00:30:43Z

Updated Navigation (incl PrevLink and NextLink)

T.Gigler: 1st dummy page

2017-12-11T23:43:40Z

1st dummy page

New page

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      <td colspan=2  {{Template:Top_10_2010:SummaryTableRowStyleTemplate|year=2017}}>
 <!--- Security Weakness: --->
-  By default, many older XML processors allow specification of an external entity, a URI that is dereferenced and evaluated during XML processing. <u>[[Source_Code_Analysis_Tools|SAST]]</u> tools can discover this issue by inspecting dependencies and configuration. <u>[[:Category:Vulnerability_Scanning_Tools|DAST]]</u> tools require additional manual steps to detect and exploit this issue. Manual testers need to be trained in how to test for XXE, as it not commonly tested as of 2017. </td>
+  By default, many older XML processors allow specification of an external entity, a URI that is dereferenced and evaluated during XML processing.<br/><u>[[Source_Code_Analysis_Tools|SAST]]</u> tools can discover this issue by inspecting dependencies and configuration. <u>[[:Category:Vulnerability_Scanning_Tools|DAST]]</u> tools require additional manual steps to detect and exploit this issue. Manual testers need to be trained in how to test for XXE, as it not commonly tested as of 2017. </td>
      <td colspan=2  {{Template:Top_10_2010:SummaryTableRowStyleTemplate|year=2017}}>
 <!--- Impacts: --->
-  These flaws can be used to extract data, execute a remote request from the server, scan internal systems, perform a denial-of-service attack, as well as execute other attacks. </td>
+  These flaws can be used to extract data, execute a remote request from the server, scan internal systems, perform a denial-of-service attack, as well as execute other attacks.<br/>The business impact depends on the protection needs of all affected application and data.</td>
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 * Implement positive ("whitelisting") server-side input validation, filtering, or sanitization to prevent hostile data within XML documents, headers, or nodes.
 * Verify that XML or XSL file upload functionality validates incoming XML using XSD validation or similar.
-* SAST tools can help detect XXE in source code, although manual code review is the best alternative in large, complex applications with many integrations.
+* <u>[[Source_Code_Analysis_Tools|SAST]]</u> tools can help detect XXE in source code, although manual code review is the best alternative in large, complex applications with many integrations.
 If these controls are not possible, consider using virtual patching, API security gateways, or Web Application Firewalls (WAFs) to detect, monitor, and block XXE attacks.

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