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CVE-2021-22538— Privilege escalation in RBAC system

Quick assessment

Affected
Google LLC Exposure Notifications Verification Server
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.

Seth Vargo exposure-notifications-verification-server是 （Seth Vargo）开源的一个应用程序。这是Exposure Notifications验证服务器的参考实现，该服务器是更广泛的Google Exposure Notifications系统的一部分。 Seth Vargo Exposure Notification Verification Server (versions prior to 0.23.1) 存在安全漏洞，攻击者可利用该漏洞创

CVSS 6.3 · Medium EPSS 0.72% · P54

Possible ATT&CK Techniques 1 AI

T1136.003 · Cloud Account
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I. Basic Information for CVE-2021-22538

Vulnerability Information
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Vulnerability Title
Privilege escalation in RBAC system
Source: CVE Program / CVE List V5
Vulnerability Description
A privilege escalation vulnerability impacting the Google Exposure Notification Verification Server (versions prior to 0.23.1), allows an attacker who (1) has UserWrite permissions and (2) is using a carefully crafted request or malicious proxy, to create another user with higher privileges than their own. This occurs due to insufficient checks on the allowed set of permissions. The new user creation event would be captured in the Event Log.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Seth Vargo Exposure Notification Verification Server 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Seth Vargo exposure-notifications-verification-server是 （Seth Vargo）开源的一个应用程序。这是Exposure Notifications验证服务器的参考实现，该服务器是更广泛的Google Exposure Notifications系统的一部分。 Seth Vargo Exposure Notification Verification Server (versions prior to 0.23.1) 存在安全漏洞，攻击者可利用该漏洞创
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
Google LLC Exposure Notifications Verification Server stable ~ 0.23.0 -

II. Public POCs for CVE-2021-22538

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III. Intelligence Information for CVE-2021-22538

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Patches & Fixes for CVE-2021-22538 (1)

Vendor Advisories for CVE-2021-22538 (1)

Other References for CVE-2021-22538 (2)

IV. Related Vulnerabilities

Same vendor: Google LLC
Same weakness: CWE-20