PySAML2 <6.5.0 - Improper Signature Verification
Title source: llmExploitation Summary
EIP tracks 4 public exploits for CVE-2021-21239. PoCs published by Crims-on, illera88, GrantBirki.
AI-analyzed exploit summary This repository contains a functional PoC for CVE-2021-21239, an XML signature validation bypass vulnerability in xmlsec. The script manipulates XML input to exploit the flaw and signs it using a provided RSA key.
Description
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.
Exploits (4)
This repository contains a functional PoC for CVE-2021-21239, an XML signature validation bypass vulnerability in xmlsec. The script manipulates XML input to exploit the flaw and signs it using a provided RSA key.
The repository contains a functional exploit for CVE-2021-21239, a SAML signature validation bypass in Redash <=10.1.0. The exploit forges a SAML response with an embedded public key to impersonate users and escalate privileges via JIT provisioning.
This repository contains a functional exploit for CVE-2021-21239, an authentication bypass vulnerability in Redash due to improper SAML signature validation in pysaml2. The PoC includes a Dockerized vulnerable Redash instance and a Python script to forge SAML responses with embedded RSA keys.
This repository contains a functional exploit for CVE-2021-21239, which manipulates SAML assertions by replacing attribute values and signature blocks to bypass authentication. The script automates the process of generating a malicious SAML response file.
References (6)
Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N