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CVE-2021-26253— Bypass of Splunk Enterprise's implementation of DUO MFA

Quick assessment

Affected
Splunk Splunk Enterprise
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.

Splunk是美国Splunk公司的一套数据收集分析软件。该软件主要用于收集、索引和分析及其所产生的数据，包括所有IT系统和基础结构（物理、虚拟机和云）生成的数据。 Splunk Enterprise 8.1.6之前版本存在安全漏洞，攻击者利用该漏洞可绕过 Splunk Enterprise中的MFA验证。

CVSS 8.1 · High EPSS 0.82% · P56

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token
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I. Basic Information for CVE-2021-26253

Vulnerability Information
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Vulnerability Title
Bypass of Splunk Enterprise's implementation of DUO MFA
Source: CVE Program / CVE List V5
Vulnerability Description
A potential vulnerability in Splunk Enterprise's implementation of DUO MFA allows for bypassing the MFA verification in Splunk Enterprise versions before 8.1.6. The potential vulnerability impacts Splunk Enterprise instances configured to use DUO MFA and does not impact or affect a DUO product or service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Splunk Enterprise 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Splunk是美国Splunk公司的一套数据收集分析软件。该软件主要用于收集、索引和分析及其所产生的数据，包括所有IT系统和基础结构（物理、虚拟机和云）生成的数据。 Splunk Enterprise 8.1.6之前版本存在安全漏洞，攻击者利用该漏洞可绕过 Splunk Enterprise中的MFA验证。
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
Splunk Splunk Enterprise Version(s) before 8.1.6 -

II. Public POCs for CVE-2021-26253

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III. Intelligence Information for CVE-2021-26253

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Other References for CVE-2021-26253 (1)

Same Patch Batch · Splunk · 2022-05-06 · 7 CVEs total

CVE-2021-42743 8.8 HIGH Local privilege escalation via a default path in Splunk Enterprise Windows
CVE-2022-26889 8.8 HIGH Path Traversal in search parameter results in external content injection
CVE-2022-27183 8.8 HIGH Reflected XSS in a query parameter of the Monitoring Console
CVE-2021-31559 7.5 HIGH S2S TcpToken authentication bypass
CVE-2021-33845 5.3 MEDIUM Username enumeration through lockout message in REST API
CVE-2022-26070 4.3 MEDIUM Error message discloses internal path

IV. Related Vulnerabilities

Same product: Splunk Enterprise
Same vendor: Splunk
Same weakness: CWE-287

V. Comments for CVE-2021-26253

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