CVE-2020-8944 Unchecked buffer overrun in ecall_restore

What is CVE-2020-8944?

CVE-2020-8944 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 write vulnerability in Asylo versions up to 0.6.0 allows an untrusted attacker to make a call to ecall_restore using the attribute output which fails to check the range of a pointer. An attacker can use this pointer to write to arbitrary memory addresses including those within the secure enclave We recommend upgrading past commit 382da2b8b09cbf928668a2445efb778f76bd9c8a

Weakness: CWE-787, CWE-120

Which versions are affected by CVE-2020-8944?

It affects 1 product.

Products include Google Asylo.

How do I fix CVE-2020-8944?

No fix has been published for CVE-2020-8944 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-2020-8944 being exploited?

There is no known exploitation of CVE-2020-8944 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 Medium 6.5
• CVE-2021-22549 Arbitrary enclave memory overwrite vulnerability in Asylo TrustedPrimitives::UntrustedCall Medium 6.5
• CVE-2021-22550 Enclave memory overwrite/overread vulnerability in Asylo UntrustedCacheMalloc::GetBuffer Medium 6.5
• CVE-2020-8904 Arbitrary trusted memory overwrite vulnerability in Asylo Medium 6.4
• CVE-2021-22552 Memory overread secure enclave in Asylo 0.6.2 Medium 5.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-mx6v-gg5x-68cf.