CVE-2021-22547 Buffer overrun in Google Cloud IoT Device SDK for Embedded C
A buffer overrun in the Google Cloud IoT Device SDK allows attackers to access heap memory, potentially leading to code execution or data disclosure.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-22547?
CVE-2021-22547 is a medium-severity memory corruption vulnerability in Google Cloud IoT Device SDK for Embedded C, published on 4 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-120
Which versions are affected by CVE-2021-22547?
It affects 1 product.
Products include Google Cloud Iot Device Sdk for Embedded C.
How do I fix CVE-2021-22547?
No fix has been published for CVE-2021-22547 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-22547 being exploited?
There is no known exploitation of CVE-2021-22547 in the wild and no public exploit code.
Sources
Also known as GHSA-q368-635x-gcfv.