Multiple SAML libraries may allow authentication bypass via incorrect XML canonicalization and DOM traversal
CVE-2017-11427

7.7HIGH

Key Information:

Vendor

Onelogin

Status
Pythonsaml
Vendor
CVE Published:
17 April 2019

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2017-11427?

OneLogin PythonSAML 2.3.0 and earlier 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.

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Affected Version(s)

PythonSAML < 2.3.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2017-11427-DEMO
Created by CHYbeta

References

https://duo.com/blog/duo-finds-saml-vulnerabilities-affec...
x_refsource_MISC
https://www.kb.cert.org/vuls/id/475445
x_refsource_MISC

CVSS V3.1

Score:
7.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability Reserved

Credit

Kelby Ludwig of Duo Security
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