CVE-2021-21239
CVSS V2 Medium 4.3
CVSS V3 Medium 6.5
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.
Overview
- CVE ID
- CVE-2021-21239
- Assigner
- security-advisories@github.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-01-21T15:15:14
- Last Modified Date
- 2021-03-10T21:00:44
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:pysaml2_project:pysaml2:*:*:*:*:*:*:*:* | 1 | OR | 6.5.0 | |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 1 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:M/Au:N/C:N/I:P/A:N
- Access Vector
- NETWORK
- Access Compatibility
- MEDIUM
- Authentication
- NONE
- Confidentiality Impact
- NONE
- Integrity Impact
- PARTIAL
- Availability Impact
- NONE
- Base Score
- 4.3
- Severity
- MEDIUM
- Exploitability Score
- 8.6
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- NONE
- User Interaction
- REQUIRED
- Scope
- UNCHANGED
- Confidentiality Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 6.5
- Base Severity
- MEDIUM
- Exploitability Score
- 2.8
- Impact Score
- 3.6
References
| Reference URL | Reference Tags |
|---|---|
| https://www.aleksey.com/pipermail/xmlsec/2013/009717.html | Exploit Mailing List Third Party Advisory |
| https://pypi.org/project/pysaml2 | Product Third Party Advisory |
| https://github.com/IdentityPython/pysaml2/releases/tag/v6.5.0 | Third Party Advisory |
| https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-5p3x-r448-pc62 | Third Party Advisory |
| https://github.com/IdentityPython/pysaml2/commit/46578df0695269a16f1c94171f1429873f90ed99 | Patch Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2021/02/msg00038.html | Mailing List Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-21239 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21239 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 07:20:22 | Added to TrackCVE | |||
| 2022-12-05 20:45:11 | 2021-01-21T15:15Z | 2021-01-21T15:15:14 | CVE Published Date | updated |
| 2022-12-05 20:45:11 | 2021-03-10T21:00:44 | CVE Modified Date | updated | |
| 2022-12-05 20:45:11 | Analyzed | Vulnerability Status | updated |