CVE-2021-21239
Improper Verification of Cryptographic Signature in PySAML2
描述
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.
如何修補 CVE-2021-21239
要修補 CVE-2021-21239,請將受影響套件升級到下列已修補版本。
- —升級至 6.5.1-1 或更新版本
- —升級至 6.5.0 或更新版本
- —升級至 46578df0695269a16f1c94171f1429873f90ed99 或更新版本
CVE-2021-21239 正在被利用嗎?
低 — EPSS 為 1.2%,目前沒有觀察到大規模利用活動。
受影響套件(3)
- from 0, < 6.5.1-1
- from 0, < 6.5.0
- from 0, < 46578df0695269a16f1c94171f1429873f90ed99 | from 0, < 6.5.0
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |