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CVE-2020-26276— SAML authentication vulnerability in Fleet

Quick assessment

Affected
fleetdm fleet
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.

Fleet是一套主机监控平台。 Fleet before version 3.5.1 存在安全漏洞，该漏洞源于Go的标准库XML解析问题，一个有效的SAML响应可能会被攻击者可利用该漏洞变异，从而修改受信任的文档。这可能导致允许来自SAML IdP的未经验证的登录。

CVSS 10.0 · Critical EPSS 2.20% · P82

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-26276

Vulnerability Information
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Vulnerability Title
SAML authentication vulnerability in Fleet
Source: CVE Program / CVE List V5
Vulnerability Description
Fleet is an open source osquery manager. In Fleet before version 3.5.1, due to issues in Go's standard library XML parsing, a valid SAML response may be mutated by an attacker to modify the trusted document. This can result in allowing unverified logins from a SAML IdP. Users that configure Fleet with SSO login may be vulnerable to this issue. This issue is patched in 3.5.1. The fix was made using https://github.com/mattermost/xml-roundtrip-validator If upgrade to 3.5.1 is not possible, users should disable SSO authentication in Fleet.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Fleet 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fleet是一套主机监控平台。 Fleet before version 3.5.1 存在安全漏洞，该漏洞源于Go的标准库XML解析问题，一个有效的SAML响应可能会被攻击者可利用该漏洞变异，从而修改受信任的文档。这可能导致允许来自SAML IdP的未经验证的登录。
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
fleetdm fleet < 3.5.1 -

II. Public POCs for CVE-2020-26276

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III. Intelligence Information for CVE-2020-26276

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Patches & Fixes for CVE-2020-26276 (1)

Vendor Advisories for CVE-2020-26276 (1)

Security Blog Posts for CVE-2020-26276 (1)

Other References for CVE-2020-26276 (2)

IV. Related Vulnerabilities

Same product: fleet
Same vendor: fleetdm
Same weakness: CWE-290

V. Comments for CVE-2020-26276

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