# CVE-2023-0657: Keycloak: impersonation via logout token exchange

> An authenticated attacker can exchange a logout token for an access token to bypass permissions and access unauthorized data in Keycloak.

- **Severity:** Low 3.4 (`CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 17 Nov 2024
- **Updated:** 17 Nov 2024
- **Also known as:** GHSA-7fpj-9hr8-28vh

## What is CVE-2023-0657?

CVE-2023-0657 is a low-severity authentication bypass vulnerability in Red Hat Single Sign-On 7, published on 17 Nov 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A flaw was found in Keycloak. This issue occurs due to improperly enforcing token types when validating signatures locally. This could allow an authenticated attacker to exchange a logout token for an access token and possibly gain access to data outside of enforced permissions.

Weakness: CWE-273 (Improper Check for Dropped Privileges)

## Which versions are affected by CVE-2023-0657?

4 open source packages ship an affected version, including org.keycloak:keycloak-services.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.keycloak:keycloak-services` | Maven | All versions | 22.0.10 |
| `org.keycloak:keycloak-services` | Maven | All versions | 22.0.10 |
| `org.keycloak:keycloak-services` | Maven | From 23.0.0 | 24.0.3 |
| `org.keycloak:keycloak-services` | Maven | From 23.0.0 | 24.0.3 |

## How do I fix CVE-2023-0657?

Upgrade org.keycloak:keycloak-services to a fixed version for your release line: 22.0.10 or 24.0.3.

## Is CVE-2023-0657 being exploited?

There is no known exploitation of CVE-2023-0657 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-0657 and fix it if it is affected.

What it is: CVE-2023-0657 is a low-severity authentication bypass vulnerability in Red Hat Single Sign-On 7, published on 17 Nov 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-0657 in the wild and no public exploit code.

Affected packages and fixed versions:
- org.keycloak:keycloak-services (Maven): affected all versions; fixed in 22.0.10
- org.keycloak:keycloak-services (Maven): affected all versions; fixed in 22.0.10
- org.keycloak:keycloak-services (Maven): affected from 23.0.0; fixed in 24.0.3
- org.keycloak:keycloak-services (Maven): affected from 23.0.0; fixed in 24.0.3

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-2023-0657/ (Markdown: https://insights.sbomify.com/CVE-2023-0657/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-0657
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-0657
- OSV: https://osv.dev/vulnerability/CVE-2023-0657

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-0657/
Summaries are generated and may contain mistakes; the official description above is the record.