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CVE-2021-31559— S2S TcpToken authentication bypass

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 8.1.5之前的8.1系列版本和8.2.1之前的8.2系列版本存在安全漏洞，攻击者利用该漏洞可通过精心制作的请求绕过 S2S TCP 令牌身份验证，将任意事件写入 Splunk Enterprise Indexer中的索引。

CVSS 7.5 · High EPSS 0.89% · P58
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I. Basic Information for CVE-2021-31559

Vulnerability Information
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Vulnerability Title
S2S TcpToken authentication bypass
Source: CVE Program / CVE List V5
Vulnerability Description
A crafted request bypasses S2S TCP Token authentication writing arbitrary events to an index in Splunk Enterprise Indexer 8.1 versions before 8.1.5 and 8.2 versions before 8.2.1. The vulnerability impacts Indexers configured to use TCPTokens. It does not impact Universal Forwarders.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
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 8.1.5之前的8.1系列版本和8.2.1之前的8.2系列版本存在安全漏洞，攻击者利用该漏洞可通过精心制作的请求绕过 S2S TCP 令牌身份验证，将任意事件写入 Splunk Enterprise Indexer中的索引。
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 8.2 version(s) before 8.2.1 -

II. Public POCs for CVE-2021-31559

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III. Intelligence Information for CVE-2021-31559

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Other References for CVE-2021-31559 (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-2021-26253 8.1 HIGH Bypass of Splunk Enterprise's implementation of DUO MFA
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-288

V. Comments for CVE-2021-31559

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