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CVE-2020-10071— Insufficient publish message length validation in MQTT

Quick assessment

Affected
zephyrproject-rtos zephyr
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.

Zephyr是美国Linux基金会的一套开源的小型的可缩放的实时操作系统。 Zephyr 2.2.0及之后版本中的MQTT解析代码存在缓冲区错误漏洞，该漏洞源于程序没有充分验证length字段。攻击者可利用该漏洞可能执行代码。

CVSS 9.0 · Critical EPSS 3.40% · P89

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-10071

Vulnerability Information
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Vulnerability Title
Insufficient publish message length validation in MQTT
Source: CVE Program / CVE List V5
Vulnerability Description
The Zephyr MQTT parsing code performs insufficient checking of the length field on publish messages, allowing a buffer overflow and potentially remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zephyr是美国Linux基金会的一套开源的小型的可缩放的实时操作系统。 Zephyr 2.2.0及之后版本中的MQTT解析代码存在缓冲区错误漏洞，该漏洞源于程序没有充分验证length字段。攻击者可利用该漏洞可能执行代码。
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
zephyrproject-rtos zephyr 2.2.0 ~ unspecified -

II. Public POCs for CVE-2020-10071

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III. Intelligence Information for CVE-2020-10071

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Patches & Fixes for CVE-2020-10071 (1)

Other References for CVE-2020-10071 (3)

Same Patch Batch · zephyrproject-rtos · 2020-06-05 · 6 CVEs total

CVE-2020-10062 9.0 CRITICAL Packet length decoding error in MQTT
CVE-2020-10070 9.0 CRITICAL MQTT buffer overflow on receive buffer
CVE-2020-10061 8.1 HIGH Error handling invalid packet sequence
CVE-2020-10063 6.8 MEDIUM Remote Denial of Service in CoAP Option Parsing Due To Integer Overflow
CVE-2020-10068 5.1 MEDIUM Zephyr Bluetooth DLE duplicate requests vulnerability

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject-rtos
Same weakness: CWE-120