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CVE-2021-42376

Quick assessment

Affected
busybox busybox
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.

BusyBox是乌克兰Denis Vlasenko个人开发者的一套包含了多个linux命令和工具的应用程序。 Busybox hush applet 存在代码问题漏洞，该漏洞源于在Busybox的hush applet中取消对NULL指针的引用将导致在处理精心制作的shell命令时拒绝服务。

AI Predicted 5.3 Difficulty: Hard EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-42376

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A NULL pointer dereference in Busybox's hush applet leads to denial of service when processing a crafted shell command, due to missing validation after a \x03 delimiter character. This may be used for DoS under very rare conditions of filtered command input.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
BusyBox 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BusyBox是乌克兰Denis Vlasenko个人开发者的一套包含了多个linux命令和工具的应用程序。 Busybox hush applet 存在代码问题漏洞，该漏洞源于在Busybox的hush applet中取消对NULL指针的引用将导致在处理精心制作的shell命令时拒绝服务。
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
busybox busybox unspecified ~ 1.34.0 -

II. Public POCs for CVE-2021-42376

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III. Intelligence Information for CVE-2021-42376

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Vendor Advisories for CVE-2021-42376 (1)

Mailing List Discussions for CVE-2021-42376 (1)

Security Blog Posts for CVE-2021-42376 (1)

Other References for CVE-2021-42376 (1)

Same Patch Batch · busybox · 2021-11-15 · 14 CVEs total

CVE-2021-42386 BusyBox 资源管理错误漏洞
CVE-2021-42385 BusyBox 资源管理错误漏洞
CVE-2021-42384 BusyBox 资源管理错误漏洞
CVE-2021-42383 BusyBox 资源管理错误漏洞
CVE-2021-42382 BusyBox 资源管理错误漏洞
CVE-2021-42381 BusyBox 资源管理错误漏洞
CVE-2021-42380 BusyBox 资源管理错误漏洞
CVE-2021-42379 BusyBox 资源管理错误漏洞
CVE-2021-42378 BusyBox 资源管理错误漏洞
CVE-2021-42377 Busybox 安全漏洞
CVE-2021-42375 BusyBox 安全漏洞
CVE-2021-42374 BusyBox 缓冲区错误漏洞
CVE-2021-42373 BusyBox 代码问题漏洞

IV. Related Vulnerabilities

Same product: busybox
Same vendor: busybox
Same weakness: CWE-476

V. Comments for CVE-2021-42376

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