# CVE-2018-1086: Information disclosure in pcs

> A remote attacker with a valid token can bypass debug parameter removal in the pcsd REST interface to disclose sensitive information and potentially elevate privileges.

- **Severity:** Medium 4.3 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **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:** 12 Apr 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-1086, DSA-4169-1, GHSA-p9pc-vgv7-x9j9, RHSA-2018:1927, UBUNTU-CVE-2018-1086

## What is CVE-2018-1086?

CVE-2018-1086 is a medium-severity vulnerability in Debian Debian Linux, published on 12 Apr 2018. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

pcs before versions 0.9.164 and 0.10 is vulnerable to a debug parameter removal bypass. REST interface of the pcsd service did not properly remove the pcs debug argument from the /run_pcs query, possibly disclosing sensitive information. A remote attacker with a valid token could use this flaw to elevate their privilege.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2018-1086?

It affects 3 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `pcs` | Red Hat:enterprise_linux:6::server | All versions | 0:0.9.155-3.el6 |
| `pcs-debuginfo` | Red Hat:enterprise_linux:6::server | All versions | 0:0.9.155-3.el6 |

Products: Clusterlabs Pacemaker Command Line Interface, Debian Debian Linux, Redhat Enterprise Linux Server Eus.

## How do I fix CVE-2018-1086?

Upgrade to a fixed version.

## Is CVE-2018-1086 being exploited?

There is no known exploitation of CVE-2018-1086 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2018-1079](https://insights.sbomify.com/CVE-2018-1079/): Path traversal in pcs (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-1086 and fix it if it is affected.

What it is: CVE-2018-1086 is a medium-severity vulnerability in Debian Debian Linux, published on 12 Apr 2018. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-1086 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2018-1086/ (Markdown: https://insights.sbomify.com/CVE-2018-1086/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1086
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1086
- OSV: https://osv.dev/vulnerability/CVE-2018-1086

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-1086/
Summaries are generated and may contain mistakes; the official description above is the record.