CVE-2021-21239

Katalog CVE

CVSS 6.5 · Medium EPSS 1,3%

Kerentanan Improper Verification of Cryptographic Signature pada pysaml2 project pysaml2, debian linux. Skor CVSS 3.1 6.5 (Medium) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

21 Januari 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

6.5 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-347: Improper Verification of Cryptographic Signature

EPSS (30 hari)

1,3% peluang dieksploitasi; lebih tinggi dari 69,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/IdentityPython/pysaml2/commit/46578df0695269a16f1c94171f1429873f90ed99 patch · advisory pihak ketiga
• https://github.com/IdentityPython/pysaml2/releases/tag/v6.5.0 advisory pihak ketiga
• https://github.com/IdentityPython/pysaml2/security/advisories/GHSA-5p3x-r448-pc62 advisory pihak ketiga
• https://lists.debian.org/debian-lts-announce/2021/02/msg00038.html mailing list · advisory pihak ketiga
• https://pypi.org/project/pysaml2 product · advisory pihak ketiga
• https://www.aleksey.com/pipermail/xmlsec/2013/009717.html exploit · mailing list · advisory pihak ketiga