# CVE-2019-20792: Use after free in n/a

> A double free vulnerability in OpenSC allows attackers to potentially execute arbitrary code or cause a denial of service via crafted smart card data.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 29 Apr 2020
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2019-20792, GHSA-m2w8-wqfw-qchx, UBUNTU-CVE-2019-20792, openSUSE-SU-2024:11643-1

## What is CVE-2019-20792?

CVE-2019-20792 is a medium-severity use after free vulnerability in Opensc Project Opensc, published on 29 Apr 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

OpenSC before 0.20.0 has a double free in coolkey_free_private_data because coolkey_add_object in libopensc/card-coolkey.c lacks a uniqueness check.

Weakness: CWE-415 (Double Free)

## Which versions are affected by CVE-2019-20792?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `opensc` | openSUSE:Tumbleweed | All versions | 0.22.0-3.1 |

Products: Opensc Project Opensc.

## How do I fix CVE-2019-20792?

Upgrade to a fixed version.

## Is CVE-2019-20792 being exploited?

There is no known exploitation of CVE-2019-20792 in the wild and no public exploit code.

## Other vulnerabilities in Opensc Project Opensc

- [CVE-2021-34193](https://insights.sbomify.com/CVE-2021-34193/): Memory corruption in n/a (high 7.5)
- [CVE-2019-16058](https://insights.sbomify.com/CVE-2019-16058/): Memory corruption in n/a (high 7.5)
- [CVE-2019-6502](https://insights.sbomify.com/CVE-2019-6502/): Denial of service in n/a (high 7.5)
- [CVE-2023-2977](https://insights.sbomify.com/CVE-2023-2977/): Memory corruption in OpenSC (high 7.1)
- [CVE-2018-16391](https://insights.sbomify.com/CVE-2018-16391/): Memory corruption in n/a (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-20792 and fix it if it is affected.

What it is: CVE-2019-20792 is a medium-severity use after free vulnerability in Opensc Project Opensc, published on 29 Apr 2020. 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-2019-20792 in the wild and no public exploit code.

Affected product: Opensc Project Opensc. 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-2019-20792/ (Markdown: https://insights.sbomify.com/CVE-2019-20792/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-20792
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-20792
- OSV: https://osv.dev/vulnerability/CVE-2019-20792

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-20792/
Summaries are generated and may contain mistakes; the official description above is the record.