# CVE-2020-8944: Unchecked buffer overrun in ecall_restore

> An attacker can write to arbitrary memory in the secure enclave via unchecked buffer overrun in ecall_restore, potentially compromising enclave integrity.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N`)
- **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:** No
- **Published:** 15 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-mx6v-gg5x-68cf

## 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 (Out-of-bounds Write), CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2020-8944?

It affects 1 product.


Products: 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.

## 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](https://insights.sbomify.com/CVE-2021-22548/): Arbitrary enclave memory overread vulnerability in Asylo TrustedPrimitives::UntrustedCall (medium 6.5)
- [CVE-2021-22549](https://insights.sbomify.com/CVE-2021-22549/): Arbitrary enclave memory overwrite vulnerability in Asylo TrustedPrimitives::UntrustedCall (medium 6.5)
- [CVE-2021-22550](https://insights.sbomify.com/CVE-2021-22550/): Enclave memory overwrite/overread vulnerability in Asylo UntrustedCacheMalloc::GetBuffer (medium 6.5)
- [CVE-2020-8904](https://insights.sbomify.com/CVE-2020-8904/): Arbitrary trusted memory overwrite vulnerability in Asylo (medium 6.4)
- [CVE-2021-22552](https://insights.sbomify.com/CVE-2021-22552/): Memory overread secure enclave in Asylo 0.6.2 (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-8944 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2020-8944 in the wild and no public exploit code.

Affected product: Google LLC Asylo. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-8944/ (Markdown: https://insights.sbomify.com/CVE-2020-8944/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-8944
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-8944
- OSV: https://osv.dev/vulnerability/CVE-2020-8944

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-8944/
Summaries are generated and may contain mistakes; the official description above is the record.