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

Quick assessment

Affected
IdentityPython pysaml2
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Idpy Pysaml2是Idpy社区的一个基于Python的SAML服务器实现。 Idpy PySAML2 before 6.5.0 存在数据伪造问题漏洞，该漏洞源于加密签名验证错误。

CVSS 6.5 · Medium EPSS 1.27% · P69
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I. Basic Information for CVE-2021-21239

Vulnerability Information
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Vulnerability Title
Open default xmlsec1 key-type preference
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Idpy Pysaml2 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Idpy Pysaml2是Idpy社区的一个基于Python的SAML服务器实现。 Idpy PySAML2 before 6.5.0 存在数据伪造问题漏洞，该漏洞源于加密签名验证错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
IdentityPython pysaml2 < 6.5.0 -

II. Public POCs for CVE-2021-21239

# POC Description Source Link Shenlong Link
1 Report documentation of this script is below https://github.com/RyanBoomer30/CVE-2021-21239-Exploit POC Details
2 A Dockerized Redash instance that is vulnerable to CVE-2021-21239 https://github.com/GrantBirki/redash-vulnerable POC Details
3 None https://github.com/illera88/CVE-2021-21239 POC Details
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III. Intelligence Information for CVE-2021-21239

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Patches & Fixes for CVE-2021-21239 (1)

Other References for CVE-2021-21239 (3)

IV. Related Vulnerabilities

Same product: pysaml2
Same vendor: IdentityPython
Same weakness: CWE-347

V. Comments for CVE-2021-21239

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