# CVE-2020-11997: Information disclosure in Apache Guacamole

> Apache Guacamole fails to restrict connection history visibility, allowing users to view other users' access details and IP addresses.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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:** 19 Jan 2021
- **Updated:** 4 Aug 2024
- **Also known as:** BIT-guacamole-2020-11997, BIT-guacamole-server-2020-11997, UBUNTU-CVE-2020-11997

## What is CVE-2020-11997?

CVE-2020-11997 is a medium-severity vulnerability in Apache Guacamole, published on 19 Jan 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Apache Guacamole 1.2.0 and earlier do not consistently restrict access to connection history based on user visibility. If multiple users share access to the same connection, those users may be able to see which other users have accessed that connection, as well as the IP addresses from which that connection was accessed, even if those users do not otherwise have permission to see other users.

Weakness: CWE-276 (Incorrect Default Permissions)

## Which versions are affected by CVE-2020-11997?

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


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `guacamole` | Bitnami | All versions | 1.2.0 |
| `guacamole-server` | Bitnami | All versions | 1.2.0 |

Products: Apache Guacamole.

## How do I fix CVE-2020-11997?

Upgrade guacamole to 1.2.0 or later.

## Is CVE-2020-11997 being exploited?

There is no known exploitation of CVE-2020-11997 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-2020-11997 and fix it if it is affected.

What it is: CVE-2020-11997 is a medium-severity vulnerability in Apache Guacamole, published on 19 Jan 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-11997 in the wild and no public exploit code.

Affected packages and fixed versions:
- guacamole (Bitnami): affected all versions; fixed in 1.2.0
- guacamole-server (Bitnami): affected all versions; fixed in 1.2.0

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-2020-11997/ (Markdown: https://insights.sbomify.com/CVE-2020-11997/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-11997
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-11997
- OSV: https://osv.dev/vulnerability/CVE-2020-11997

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-11997/
Summaries are generated and may contain mistakes; the official description above is the record.