Executive Summary

Informations
Name CVE-2021-21239 First vendor Publication 2021-01-21
Vendor Cve Last vendor Modification 2021-03-10

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Overall CVSS Score 6.5
Base Score 6.5 Environmental Score 6.5
impact SubScore 3.6 Temporal Score 6.5
Exploitabality Sub Score 2.8
 
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction Required
Scope Unchanged Confidentiality Impact None
Integrity Impact High Availability Impact None
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Cvss Base Score 4.3 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21239

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-347 Improper Verification of Cryptographic Signature

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 2
Os 1

Sources (Detail)

Source Url
CONFIRM https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-5p3x-r448-...
MISC https://github.com/IdentityPython/pysaml2/commit/46578df0695269a16f1c94171f14...
https://github.com/IdentityPython/pysaml2/releases/tag/v6.5.0
https://pypi.org/project/pysaml2
https://www.aleksey.com/pipermail/xmlsec/2013/009717.html
MLIST https://lists.debian.org/debian-lts-announce/2021/02/msg00038.html

Alert History

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Date Informations
2021-05-04 14:08:10
  • Multiple Updates
2021-04-22 03:12:41
  • Multiple Updates
2021-03-26 12:37:59
  • Multiple Updates
2021-01-29 21:23:37
  • Multiple Updates
2021-01-26 21:23:50
  • Multiple Updates
2021-01-21 21:23:33
  • First insertion