# CVE-2022-43755: Rancher: Non-random authentication token

> Attackers can reuse cattle-tokens after renewal due to insufficient entropy, allowing continued unauthorized access to Rancher.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:H`)
- **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 Feb 2023
- **Updated:** 25 Mar 2025
- **Also known as:** GHSA-8c69-r38j-rpfj

## What is CVE-2022-43755?

CVE-2022-43755 is a high-severity vulnerability in SUSE Rancher, published on 7 Feb 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A Insufficient Entropy vulnerability in SUSE Rancher allows attackers that gained knowledge of the cattle-token to continue abusing this even after the token was renewed. This issue affects: SUSE Rancher Rancher versions prior to 2.6.10; Rancher versions prior to 2.7.1.

Weakness: CWE-331 (Insufficient Entropy)

## Which versions are affected by CVE-2022-43755?

4 open source packages ship an affected version, including github.com/rancher/rancher. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/rancher/rancher` | Go | From 2.6.0 | 2.6.10 |
| `github.com/rancher/rancher` | Go | From 2.6.0 | 2.6.10 |
| `github.com/rancher/rancher` | Go | From 2.7.0 | 2.7.1 |
| `github.com/rancher/rancher` | Go | From 2.7.0 | 2.7.1 |

Products: Suse Rancher.

## How do I fix CVE-2022-43755?

Upgrade github.com/rancher/rancher to a fixed version for your release line: 2.6.10 or 2.7.1.

## Is CVE-2022-43755 being exploited?

There is no known exploitation of CVE-2022-43755 in the wild and no public exploit code.

## Other vulnerabilities in SUSE Rancher

- [CVE-2023-22647](https://insights.sbomify.com/CVE-2023-22647/): Rancher vulnerable to Privilege Escalation via manipulation of Secrets (critical 9.9)
- [CVE-2023-22651](https://insights.sbomify.com/CVE-2023-22651/): Rancher Webhook is misconfigured during upgrade process (critical 9.9)
- [CVE-2022-43757](https://insights.sbomify.com/CVE-2022-43757/): Rancher: Exposure of sensitive fields (critical 9.9)
- [CVE-2021-36782](https://insights.sbomify.com/CVE-2021-36782/): Rancher: Plaintext storage and exposure of credentials in Rancher API and cluster.management.cattle.io object (critical 9.9)
- [CVE-2021-36783](https://insights.sbomify.com/CVE-2021-36783/): Rancher: Failure to properly sanitize credentials in cluster template answers (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-43755 and fix it if it is affected.

What it is: CVE-2022-43755 is a high-severity vulnerability in SUSE Rancher, published on 7 Feb 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-2022-43755 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/rancher/rancher (Go): affected from 2.6.0; fixed in 2.6.10
- github.com/rancher/rancher (Go): affected from 2.6.0; fixed in 2.6.10
- github.com/rancher/rancher (Go): affected from 2.7.0; fixed in 2.7.1
- github.com/rancher/rancher (Go): affected from 2.7.0; fixed in 2.7.1

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-2022-43755/ (Markdown: https://insights.sbomify.com/CVE-2022-43755/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-43755
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-43755
- OSV: https://osv.dev/vulnerability/CVE-2022-43755

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-43755/
Summaries are generated and may contain mistakes; the official description above is the record.