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CVE-2021-3422— Indexer denial-of-service via malformed S2S request

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 存在安全漏洞，该漏洞源于协议中缺少对键值字段的验证。攻击者利用该漏洞可以导致索引通用转发器流量的 Splunk Enterprise 实例中的拒绝服务。

CVSS 7.5 · High EPSS 0.60% · P47
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I. Basic Information for CVE-2021-3422

Vulnerability Information
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Vulnerability Title
Indexer denial-of-service via malformed S2S request
Source: CVE Program / CVE List V5
Vulnerability Description
The lack of validation of a key-value field in the Splunk-to-Splunk protocol results in a denial-of-service in Splunk Enterprise instances configured to index Universal Forwarder traffic. The vulnerability impacts Splunk Enterprise versions before 7.3.9, 8.0 versions before 8.0.9, and 8.1 versions before 8.1.3. It does not impact Universal Forwarders. When Splunk forwarding is secured using TLS or a Token, the attack requires compromising the certificate or token, or both. Implementation of either or both reduces the severity to Medium.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Splunk Enterprise 输入验证错误漏洞
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 存在安全漏洞，该漏洞源于协议中缺少对键值字段的验证。攻击者利用该漏洞可以导致索引通用转发器流量的 Splunk Enterprise 实例中的拒绝服务。
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 8.2.0 -

II. Public POCs for CVE-2021-3422

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III. Intelligence Information for CVE-2021-3422

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Other References for CVE-2021-3422 (2)

IV. Related Vulnerabilities

Same product: Splunk Enterprise
Same vendor: Splunk
Same weakness: CWE-125

V. Comments for CVE-2021-3422

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