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CVE-2018-6922

Quick assessment

Affected
FreeBSD FreeBSD
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.

FreeBSD是由Core Team团队负责的FreeBSD项目中的一套类Unix自由操作系统，是经过BSD、386BSD和4.4BSD发展而来的类Unix的一个重要分支。 FreeBSD 11.2-RELEASE-p1之前版本、11.1-RELEASE-p12之前版本和10.4-RELEASE-p10之前版本中存在安全漏洞，该漏洞源于带有TCP段的数据结构使用了不合理的算法来重组数据。攻击者可利用该漏洞通过发送TCP流量利用该漏洞降低用户系统的网络性能和/或消耗大量CPU。

AI Predicted 6.0 Difficulty: Moderate EPSS 3.23% · P87
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I. Basic Information for CVE-2018-6922

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
One of the data structures that holds TCP segments in all versions of FreeBSD prior to 11.2-RELEASE-p1, 11.1-RELEASE-p12, and 10.4-RELEASE-p10 uses an inefficient algorithm to reassemble the data. This causes the CPU time spent on segment processing to grow linearly with the number of segments in the reassembly queue. An attacker who has the ability to send TCP traffic to a victim system can degrade the victim system's network performance and/or consume excessive CPU by exploiting the inefficiency of TCP reassembly handling, with relatively small bandwidth cost.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是由Core Team团队负责的FreeBSD项目中的一套类Unix自由操作系统，是经过BSD、386BSD和4.4BSD发展而来的类Unix的一个重要分支。 FreeBSD 11.2-RELEASE-p1之前版本、11.1-RELEASE-p12之前版本和10.4-RELEASE-p10之前版本中存在安全漏洞，该漏洞源于带有TCP段的数据结构使用了不合理的算法来重组数据。攻击者可利用该漏洞通过发送TCP流量利用该漏洞降低用户系统的网络性能和/或消耗大量CPU。
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
FreeBSD FreeBSD All versions prior to 11.2-RELEASE-p1, 11.1-RELEASE-p12, 10.4-RELEASE-p10 -

II. Public POCs for CVE-2018-6922

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III. Intelligence Information for CVE-2018-6922

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Vendor Advisories for CVE-2018-6922 (4)

Other References for CVE-2018-6922 (1)

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-400

V. Comments for CVE-2018-6922

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