CVE-2020-8942 Unchecked buffer overrun in enc_untrusted_read
An untrusted attacker can read memory outside the intended buffer, including secure enclave memory, due to unchecked size validation in Asylo.
- 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-2020-8942?
CVE-2020-8942 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 arbitrary memory read vulnerability in Asylo versions up to 0.6.0 allows an untrusted attacker to make a call to enc_untrusted_read whose return size was not validated against the requrested size. The parameter size is unchecked allowing the attacker to read memory locations outside of the intended buffer size including memory addresses within the secure enclave. We recommend upgrading past commit b1d120a2c7d7446d2cc58d517e20a1b184b82200
Which versions are affected by CVE-2020-8942?
It affects 1 product.
Products include Google Asylo.
How do I fix CVE-2020-8942?
No fix has been published for CVE-2020-8942 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-2020-8942 being exploited?
There is no known exploitation of CVE-2020-8942 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-7cfx-r8g4-h73j.