Headline
CVE-2018-5387: CERT/CC Vulnerability Note VU#475445
Wizkunde SAMLBase may incorrectly utilize the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature, allowing the attack to potentially bypass authentication to SAML service providers.
Overview
Multiple SAML libraries may incorrectly utilize the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature, allowing the attack to potentially bypass authentication to SAML service providers.
Description
CWE-287****: Improper Authentication
Security Assertion Markup Language (SAML) is an XML-based markup language for security assertions regarding authentication and permissions, most commonly used for single sign-on (SSO) services.
Some XML DOM traversal and canonicalization APIs may be inconsistent in handling of comments within XML nodes. Incorrect use of these APIs by some SAML libraries results in incorrect parsing of the inner text of XML nodes such that any inner text after the comment is lost prior to cryptographically signing the SAML message. Text after the comment therefore has no impact on the signature on the SAML message.
A remote attacker can modify SAML content for a SAML service provider without invalidating the cryptographic signature, which may allow attackers to bypass primary authentication for the affected SAML service provider
The following CVEs are assigned:
CVE-2017-11427 - OneLogin’s “python-saml”
CVE-2017-11428 - OneLogin’s “ruby-saml”
CVE-2017-11429 - Clever’s “saml2-js”
CVE-2017-11430 - “OmniAuth-SAML”
CVE-2018-0489 - Shibboleth openSAML C++
CVE-2018-5387 - Wizkunde SAMLBase
More information is available in the researcher’s blog post.
Impact
By modifying SAML content without invalidating the cryptographic signature, a remote, unauthenticated attacker may be able to bypass primary authentication for an affected SAML service provider.
Solution
Apply updates
Affected SAML service providers should update software to utilize the latest releases of affected SAML libraries. Please see the vendor list below for more information.
Vendor Information
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CVSS Metrics
Group
Score
Vector
Base
6.3
AV:N/AC:M/Au:S/C:C/I:N/A:N
Temporal
4.9
E:POC/RL:OF/RC:C
Environmental
4.9
CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND
References****Acknowledgements
Thanks to Kelby Ludwig of Duo Security for reporting this vulnerability.
This document was written by Garret Wassermann.
Other Information