Open default xmlsec1 key-type preference
CVE-2021-21239

6.5MEDIUM

Key Information:

Vendor: Identitypython
Status: Pysaml2
Vendor: CVE Published:; 21 January 2021

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👾 Exploit Exists🟡 Public PoC

What is CVE-2021-21239?

PySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 before 6.5.0 has an improper verification of cryptographic signature vulnerability. Users of pysaml2 that use the default CryptoBackendXmlSec1 backend and need to verify signed SAML documents are impacted. PySAML2 does not ensure that a signed SAML document is correctly signed. The default CryptoBackendXmlSec1 backend is using the xmlsec1 binary to verify the signature of signed SAML documents, but by default xmlsec1 accepts any type of key found within the given document. xmlsec1 needs to be configured explicitly to only use only x509 certificates for the verification process of the SAML document signature. This is fixed in PySAML2 6.5.0.

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Affected Version(s)

pysaml2 < 6.5.0

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.

redash-vulnerable
Created by GrantBirki

CVE-2021-21239
Created by Crims-on