CVE-2023-21020 Use after free in Android
A use-after-free flaw in Android's signal handler registration allows local attackers with system privileges to execute arbitrary code and escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-21020?
CVE-2023-21020 is a medium-severity use after free vulnerability in Google Android, published on 24 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In registerSignalHandlers of main.c, there is a possible local arbitrary code execution due to a use after free. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-13Android ID: A-256591441
Weakness: CWE-416
Which versions are affected by CVE-2023-21020?
It affects 1 product.
Products include Google Android.
How do I fix CVE-2023-21020?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2023-21020 being exploited?
There is no known exploitation of CVE-2023-21020 in the wild and no public exploit code.
Other vulnerabilities in Google Android
Sources
Also known as A-256591441, GHSA-6g7v-365p-9jh2, PUB-A-256591441.