CVE-2020-8939 Out of Bounds read in Asylo
An out-of-bounds read in Asylo allows attackers to read memory from the enclave heap via the inet_ntop function.
- 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-2020-8939?
CVE-2020-8939 is a medium-severity memory corruption vulnerability in Google LLC Asylo, published on 15 Dec 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An out of bounds read on the enc_untrusted_inet_ntop function allows an attack to extend the result size that is used by memcpy() to read memory from within the enclave heap. We recommend upgrading past commit 6ff3b77ffe110a33a2f93848a6333f33616f02c4
Weakness: CWE-125
Which versions are affected by CVE-2020-8939?
It affects 1 product.
Products include Google Asylo.
How do I fix CVE-2020-8939?
No fix has been published for CVE-2020-8939 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-2020-8939 being exploited?
There is no known exploitation of CVE-2020-8939 in the wild and no public exploit code.
Other vulnerabilities in Google LLC Asylo
- CVE-2021-22548 Arbitrary enclave memory overread vulnerability in Asylo TrustedPrimitives::UntrustedCall
- CVE-2021-22549 Arbitrary enclave memory overwrite vulnerability in Asylo TrustedPrimitives::UntrustedCall
- CVE-2021-22550 Enclave memory overwrite/overread vulnerability in Asylo UntrustedCacheMalloc::GetBuffer
- CVE-2020-8904 Arbitrary trusted memory overwrite vulnerability in Asylo
- CVE-2021-22552 Memory overread secure enclave in Asylo 0.6.2
Sources
Also known as GHSA-8mgg-4h42-8rj6.