Vulnerability Details : CVE-2021-21238
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.
Exploit prediction scoring system (EPSS) score for CVE-2021-21238
Probability of exploitation activity in the next 30 days: 0.09%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 39 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2021-21238
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
[email protected] |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
2.8
|
3.6
|
[email protected] |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |
2.8
|
3.6
|
[email protected] |
CWE ids for CVE-2021-21238
-
The product does not verify, or incorrectly verifies, the cryptographic signature for data.Assigned by: [email protected] (Primary)
References for CVE-2021-21238
-
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
Products affected by CVE-2021-21238
- cpe:2.3:a:pysaml2_project:pysaml2:*:*:*:*:*:*:*:*