CVE-2020-26290— Critical security issues in XML encoding in Dex
Quick assessment
Affected
dexidp dex
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.
Dexidp Dex是Dexidp团队的一个基于Go语言用于通过OpenId来进行安全验证的软件。 Dex 2.27.0之前版本存在安全漏洞，该漏洞源于底层Go库中的XML编码存在问题，会影响用户利用SAML连接器。这些漏洞使得潜在的签名绕过成为可能。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-26290
Vulnerability Information
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Vulnerability Title
Critical security issues in XML encoding in Dex
Source: CVE Program / CVE List V5
Vulnerability Description
Dex is a federated OpenID Connect provider written in Go. In Dex before version 2.27.0 there is a critical set of vulnerabilities which impacts users leveraging the SAML connector. The vulnerabilities enables potential signature bypass due to issues with XML encoding in the underlying Go library. The vulnerabilities have been addressed in version 2.27.0 by using the xml-roundtrip-validator from Mattermost (see related references).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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
Dexidp Dex 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Dexidp Dex是Dexidp团队的一个基于Go语言用于通过OpenId来进行安全验证的软件。 Dex 2.27.0之前版本存在安全漏洞，该漏洞源于底层Go库中的XML编码存在问题，会影响用户利用SAML连接器。这些漏洞使得潜在的签名绕过成为可能。
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
II. Public POCs for CVE-2020-26290
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Patches & Fixes for CVE-2020-26290 (1)
Vendor Advisories for CVE-2020-26290 (3)
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https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5 x_refsource_CONFIRM
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Security Blog Posts for CVE-2020-26290 (1)
Other References for CVE-2020-26290 (3)
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https://github.com/dexidp/dex/releases/tag/v2.27.0 x_refsource_MISC
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V. Comments for CVE-2020-26290
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