CVE-2021-21238
Apache PySAML2 XML Signature Wrapping 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. All users of pysaml2 that need to validate signed SAML documents are impacted. The vulnerability is a variant of XML Signature wrapping because it did not validate the SAML document against an XML schema. This allowed invalid XML documents to be processed and such a document can trick pysaml2 with a wrapped signature. This is fixed in PySAML2 6.5.0.
INFO
Published Date :
Jan. 21, 2021, 3:15 p.m.
Last Modified :
Jan. 29, 2021, 5:58 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
2.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-21238.
| URL | Resource |
|---|---|
| https://github.com/IdentityPython/pysaml2/commit/1d8fd268f5bf887480a403a7a5ef8f048157cc14 | Patch Third Party Advisory |
| https://github.com/IdentityPython/pysaml2/releases/tag/v6.5.0 | Third Party Advisory |
| https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-f4g9-h89h-jgv9 | Third Party Advisory |
| https://pypi.org/project/pysaml2 | Product Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-21238 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-21238 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Jan. 29, 2021
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Changed Reference Type https://github.com/IdentityPython/pysaml2/commit/1d8fd268f5bf887480a403a7a5ef8f048157cc14 No Types Assigned https://github.com/IdentityPython/pysaml2/commit/1d8fd268f5bf887480a403a7a5ef8f048157cc14 Patch, Third Party Advisory Changed Reference Type https://github.com/IdentityPython/pysaml2/releases/tag/v6.5.0 No Types Assigned https://github.com/IdentityPython/pysaml2/releases/tag/v6.5.0 Third Party Advisory Changed Reference Type https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-f4g9-h89h-jgv9 No Types Assigned https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-f4g9-h89h-jgv9 Third Party Advisory Changed Reference Type https://pypi.org/project/pysaml2 No Types Assigned https://pypi.org/project/pysaml2 Product, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:pysaml2_project:pysaml2:*:*:*:*:*:*:*:* versions up to (excluding) 6.5.0 -
CVE Modified by [email protected]
Jan. 26, 2021
Action Type Old Value New Value Changed 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. All users of pysaml2 that need to validate signed SAML documents are impacted. The vulnerability is a variant of XML Signature wrapping because it did not validate the SAML document against an XML schema. This allowed invalid XML documents to be processed and such a document can trick pysaml2 with a wrapped signature. This is fixed in PySAML2 6.5.0. PySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 before 6.5.0 has an improper verification of cryptographic signature vulnerability. All users of pysaml2 that need to validate signed SAML documents are impacted. The vulnerability is a variant of XML Signature wrapping because it did not validate the SAML document against an XML schema. This allowed invalid XML documents to be processed and such a document can trick pysaml2 with a wrapped signature. This is fixed in PySAML2 6.5.0.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-21238 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-21238
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.13 }} 0.02%
score
0.48816
percentile