# CVE-2020-24455: Privilege escalation in TPM2 source

> A missing variable initialization in the TPM2 source allows a privileged local user to escalate privileges.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Feb 2021
- **Updated:** 4 Aug 2024
- **Also known as:** AZL-6924, DEBIAN-CVE-2020-24455, GHSA-qh4p-3mhw-2cp7, MGASA-2020-0417, OESA-2021-1016, openSUSE-SU-2024:11470-1

## What is CVE-2020-24455?

CVE-2020-24455 is a medium-severity vulnerability in Fedoraproject Fedora, published on 26 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Missing initialization of a variable in the TPM2 source may allow a privileged user to potentially enable an escalation of privilege via local access. This affects tpm2-tss before 3.0.1 and before 2.4.3.

Weakness: CWE-909 (Missing Initialization of Resource)

## Which versions are affected by CVE-2020-24455?

It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `tpm2-0-tss` | openSUSE:Tumbleweed | All versions | 3.1.0-1.2 |

Products: Fedoraproject Fedora, Tpm2 Software Stack Project Tpm2 Software Stack.

## How do I fix CVE-2020-24455?

Upgrade to a fixed version.

## Is CVE-2020-24455 being exploited?

There is no known exploitation of CVE-2020-24455 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-24455 and fix it if it is affected.

What it is: CVE-2020-24455 is a medium-severity vulnerability in Fedoraproject Fedora, published on 26 Feb 2021. 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-2020-24455 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2020-24455/ (Markdown: https://insights.sbomify.com/CVE-2020-24455/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-24455
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-24455
- OSV: https://osv.dev/vulnerability/CVE-2020-24455

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-24455/
Summaries are generated and may contain mistakes; the official description above is the record.