# CVE-2023-30576: Apache Guacamole: Use-after-free in handling of RDP audio input buffer

> An attacker can execute arbitrary code with guacd privileges by exploiting a use-after-free vulnerability in the RDP audio input buffer handling.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 7 Jun 2023
- **Updated:** 10 Oct 2024
- **Also known as:** BIT-guacamole-2023-30576, BIT-guacamole-server-2023-30576, GHSA-q7pp-7w87-cjxp, UBUNTU-CVE-2023-30576

## What is CVE-2023-30576?

CVE-2023-30576 is a medium-severity use after free vulnerability in Apache Guacamole, published on 7 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Apache Guacamole 0.9.10 through 1.5.1 may continue to reference a freed RDP audio input buffer. Depending on timing, this may allow an attacker to execute arbitrary code with the privileges of the guacd process.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2023-30576?

2 open source packages ship an affected version, including guacamole and guacamole-server. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `guacamole` | Bitnami | From 0.9.0 | 1.5.2 |
| `guacamole-server` | Bitnami | From 0.9.0 | 1.5.2 |

Products: Apache Guacamole.

## How do I fix CVE-2023-30576?

Upgrade guacamole to 1.5.2 or later.

## Is CVE-2023-30576 being exploited?

There is no known exploitation of CVE-2023-30576 in the wild and no public exploit code.

## Other vulnerabilities in Apache Guacamole

- [CVE-2021-43999](https://insights.sbomify.com/CVE-2021-43999/): Improper validation of SAML responses (high 8.8)
- [CVE-2017-3158](https://insights.sbomify.com/CVE-2017-3158/): Apache Guacamole Race Condition vulnerability (high 8.1)
- [CVE-2023-43826](https://insights.sbomify.com/CVE-2023-43826/): Apache Guacamole: Integer overflow in handling of VNC image buffers (high 7.5)
- [CVE-2019-19603](https://insights.sbomify.com/CVE-2019-19603/): Null dereference in n/a (high 7.5)
- [CVE-2018-1340](https://insights.sbomify.com/CVE-2018-1340/): Missing Encryption of Sensitive Data in Apache Guacamole (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-30576 and fix it if it is affected.

What it is: CVE-2023-30576 is a medium-severity use after free vulnerability in Apache Guacamole, published on 7 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-30576 in the wild and no public exploit code.

Affected packages and fixed versions:
- guacamole (Bitnami): affected from 0.9.0; fixed in 1.5.2
- guacamole-server (Bitnami): affected from 0.9.0; fixed in 1.5.2

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-2023-30576/ (Markdown: https://insights.sbomify.com/CVE-2023-30576/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-30576
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-30576
- OSV: https://osv.dev/vulnerability/CVE-2023-30576

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-30576/
Summaries are generated and may contain mistakes; the official description above is the record.