CVE-2020-0421 Memory corruption in Android
A local attacker can escalate privileges via an out-of-bounds write in Android's String8.cpp without user interaction.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-0421?
CVE-2020-0421 is a high-severity memory corruption vulnerability in Google Android, published on 14 Oct 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In appendFormatV of String8.cpp, there is a possible out of bounds write due to incorrect error handling. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-8.1 Android-9 Android-10 Android-11 Android-8.0Android ID: A-161894517
Which versions are affected by CVE-2020-0421?
It affects 1 product.
Products include Google Android.
How do I fix CVE-2020-0421?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-0421 being exploited?
There is no known exploitation of CVE-2020-0421 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Google Android
Sources
Also known as A-161894517, ASB-A-161894517, GHSA-29fp-7w52-3694.