# CVE-2017-5731: Privilege escalation in Tianocore

> An authenticated local attacker can exploit bounds checking flaws in Tianocore firmware to escalate privileges.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** Yes
- **Published:** 28 Oct 2019
- **Updated:** 5 Aug 2024
- **Also known as:** UBUNTU-CVE-2017-5731

## What is CVE-2017-5731?

CVE-2017-5731 is a high-severity vulnerability in Tianocore, published on 28 Oct 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Bounds checking in Tianocompress before November 7, 2017 may allow an authenticated user to potentially enable an escalation of privilege via local access.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2017-5731?

It affects 1 product.


Products: Tianocore Edk2.

## How do I fix CVE-2017-5731?

Apply the vendor's patch.

## Is CVE-2017-5731 being exploited?

There is no known exploitation of CVE-2017-5731 in the wild and no public exploit code.

## Other vulnerabilities in Tianocore

- [CVE-2023-45230](https://insights.sbomify.com/CVE-2023-45230/): Buffer Overflow in EDK II Network Package (high 8.3)
- [CVE-2023-45234](https://insights.sbomify.com/CVE-2023-45234/): Buffer Overflow in EDK II Network Package (high 8.3)
- [CVE-2023-45235](https://insights.sbomify.com/CVE-2023-45235/): Buffer Overflow in EDK II Network Package (high 8.3)
- [CVE-2021-28210](https://insights.sbomify.com/CVE-2021-28210/): Denial of service in EDK II (high 7.8)
- [CVE-2019-14584](https://insights.sbomify.com/CVE-2019-14584/): Null dereference in Tianocore EDK2 (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-5731 and fix it if it is affected.

What it is: CVE-2017-5731 is a high-severity vulnerability in Tianocore, published on 28 Oct 2019. 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-2017-5731 in the wild and no public exploit code.

Affected product: Tianocore. 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-2017-5731/ (Markdown: https://insights.sbomify.com/CVE-2017-5731/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-5731
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-5731
- OSV: https://osv.dev/vulnerability/CVE-2017-5731

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-5731/
Summaries are generated and may contain mistakes; the official description above is the record.