# CVE-2020-11047: Out-of-bounds Read in FreeRDP

> A malicious server can read up to 8 bytes of client memory via a manipulated message in FreeRDP, requiring an upgrade to fix.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 7 May 2020
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-11047, GHSA-9fw6-m2q8-h5pw, UBUNTU-CVE-2020-11047

## What is CVE-2020-11047?

CVE-2020-11047 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 7 May 2020. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

In FreeRDP after 1.1 and before 2.0.0, there is an out-of-bounds read in autodetect_recv_bandwidth_measure_results. A malicious server can extract up to 8 bytes of client memory with a manipulated message by providing a short input and reading the measurement result data. This has been patched in 2.0.0.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2020-11047?

It affects 3 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Freerdp Freerdp.

## How do I fix CVE-2020-11047?

Upgrade to a fixed version.

## Is CVE-2020-11047 being exploited?

There is no known exploitation of CVE-2020-11047 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-11047 and fix it if it is affected.

What it is: CVE-2020-11047 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 7 May 2020. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-11047 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2020-11047/ (Markdown: https://insights.sbomify.com/CVE-2020-11047/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-11047
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-11047
- OSV: https://osv.dev/vulnerability/CVE-2020-11047

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-11047/
Summaries are generated and may contain mistakes; the official description above is the record.