# CVE-2018-0134: Information disclosure in Cisco Policy Suite

> An unauthenticated remote attacker can determine valid subscriber usernames by analyzing distinct RADIUS authentication failure messages.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Feb 2018
- **Updated:** 2 Dec 2024
- **Also known as:** GHSA-rm29-q8c8-prwc

## What is CVE-2018-0134?

CVE-2018-0134 is a medium-severity vulnerability in Cisco Policy Suite, published on 8 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the RADIUS authentication module of Cisco Policy Suite could allow an unauthenticated, remote attacker to determine whether a subscriber username is valid. The vulnerability occurs because the Cisco Policy Suite RADIUS server component returns different authentication failure messages based on the validity of usernames. An attacker could use these messages to determine whether a valid subscriber username has been identified. The attacker could use this information in subsequent attacks against the system. Cisco Bug IDs: CSCvg47830.

Weakness: CWE-203 (Observable Discrepancy), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2018-0134?

It affects 1 product.


Products: Cisco Mobility Services Engine.

## How do I fix CVE-2018-0134?

No fix has been published for CVE-2018-0134 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-0134 being exploited?

There is no known exploitation of CVE-2018-0134 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Policy Suite

- [CVE-2018-0374](https://insights.sbomify.com/CVE-2018-0374/): Missing authorization in Cisco Policy Suite unknown (critical 9.8)
- [CVE-2018-0375](https://insights.sbomify.com/CVE-2018-0375/): Hardcoded credentials in Cisco Policy Suite unknown (critical 9.8)
- [CVE-2018-0376](https://insights.sbomify.com/CVE-2018-0376/): Missing authorization in Cisco Policy Suite unknown (critical 9.8)
- [CVE-2018-0377](https://insights.sbomify.com/CVE-2018-0377/): Missing authorization in Cisco Policy Suite unknown (critical 9.8)
- [CVE-2018-0116](https://insights.sbomify.com/CVE-2018-0116/): Auth bypass in Cisco Policy Suite (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-0134 and fix it if it is affected.

What it is: CVE-2018-0134 is a medium-severity vulnerability in Cisco Policy Suite, published on 8 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-0134 in the wild and no public exploit code.

Affected product: Cisco Policy Suite. 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-2018-0134/ (Markdown: https://insights.sbomify.com/CVE-2018-0134/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-0134
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-0134
- OSV: https://osv.dev/vulnerability/CVE-2018-0134

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-0134/
Summaries are generated and may contain mistakes; the official description above is the record.