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CVE-2021-21238— SAML XML Signature wrapping

Quick assessment

Affected
IdentityPython pysaml2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Idpy Pysaml2是Idpy社区的一个基于Python的SAML服务器实现。 Idpy PySAML2 before 6.5.0 存在数据伪造问题漏洞，该漏洞源于存在加密签名验证错误漏洞。攻击者可利用该漏洞处理无效的XML文档。

CVSS 6.5 · Medium EPSS 1.08% · P64

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-21238

Vulnerability Information
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Vulnerability Title
SAML XML Signature wrapping
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Idpy Pysaml2 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Idpy Pysaml2是Idpy社区的一个基于Python的SAML服务器实现。 Idpy PySAML2 before 6.5.0 存在数据伪造问题漏洞，该漏洞源于存在加密签名验证错误漏洞。攻击者可利用该漏洞处理无效的XML文档。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
IdentityPython pysaml2 < 6.5.0 -

II. Public POCs for CVE-2021-21238

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III. Intelligence Information for CVE-2021-21238

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Patches & Fixes for CVE-2021-21238 (1)

Vendor Advisories for CVE-2021-21238 (1)

Other References for CVE-2021-21238 (2)

IV. Related Vulnerabilities

Same product: pysaml2
Same vendor: IdentityPython
Same weakness: CWE-347

V. Comments for CVE-2021-21238

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