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CVE-2021-22547— Buffer overrun in Google Cloud IoT Device SDK for Embedded C

Quick assessment

Affected
Google LLC Google Cloud IoT Device SDK for Embedded C
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.

iot-device-sdk-embedded-c是一个应用插件。用于嵌入式C的Google Cloud IoT设备SDK是易于移植的开源C库，可将低端IoT设备连接到Google Cloud IoT Core。 iot-device-sdk-embedded-c 1.03之前版本存在安全漏洞，该漏洞源于calloc()的实现没有长度检查。攻击者可利用该漏洞可以传入比缓冲区大的内存对象，并包围一个比所需的更小的缓冲区，从而允许攻击者访问堆的其他部分。

CVSS 6.3 · Medium EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-22547

Vulnerability Information
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Vulnerability Title
Buffer overrun in Google Cloud IoT Device SDK for Embedded C
Source: CVE Program / CVE List V5
Vulnerability Description
In IoT Devices SDK, there is an implementation of calloc() that doesn't have a length check. An attacker could pass in memory objects larger than the buffer and wrap around to have a smaller buffer than required, allowing the attacker access to the other parts of the heap. We recommend upgrading the Google Cloud IoT Device SDK for Embedded C used to 1.0.3 or greater.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
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
iot-device-sdk-embedded-c 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
iot-device-sdk-embedded-c是一个应用插件。用于嵌入式C的Google Cloud IoT设备SDK是易于移植的开源C库，可将低端IoT设备连接到Google Cloud IoT Core。 iot-device-sdk-embedded-c 1.03之前版本存在安全漏洞，该漏洞源于calloc()的实现没有长度检查。攻击者可利用该漏洞可以传入比缓冲区大的内存对象，并包围一个比所需的更小的缓冲区，从而允许攻击者访问堆的其他部分。
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
Google LLC Google Cloud IoT Device SDK for Embedded C unspecified ~ 1.0.2 -

II. Public POCs for CVE-2021-22547

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III. Intelligence Information for CVE-2021-22547

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Other References for CVE-2021-22547 (1)

IV. Related Vulnerabilities

Same vendor: Google LLC
Same weakness: CWE-120