# CVE-2018-18366: Information disclosure in Norton Security

> A specially crafted IRP request in Symantec security drivers can leak uninitialized kernel memory, potentially exposing sensitive data to local attackers.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Apr 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-6mpj-9376-4g2w

## What is CVE-2018-18366?

CVE-2018-18366 is a medium-severity vulnerability in Symantec Endpoint Protection, published on 25 Apr 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Symantec Norton Security prior to 22.16.3, SEP (Windows client) prior to and including 12.1 RU6 MP9, and prior to 14.2 RU1, SEP SBE prior to Cloud Agent 3.00.31.2817, NIS-22.15.2.22, SEP-12.1.7484.7002 and SEP Cloud prior to 22.16.3 may be susceptible to a kernel memory disclosure, which is a type of issue where a specially crafted IRP request can cause the driver to return uninitialized memory.

Weakness: CWE-908 (Use of Uninitialized Resource)

## Which versions are affected by CVE-2018-18366?

It affects 4 products.


Products: Symantec Endpoint Protection, Symantec Endpoint Protection Cloud, Symantec Endpoint Protection Cloud Agent, Symantec Norton Security.

## How do I fix CVE-2018-18366?

No fix has been published for CVE-2018-18366 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-18366 being exploited?

There is no known exploitation of CVE-2018-18366 in the wild and no public exploit code.

## Other vulnerabilities in Symantec Endpoint Protection

- [CVE-2012-0295](https://insights.sbomify.com/CVE-2012-0295/): Code injection in n/a (critical 9.3)
- [CVE-2018-5237](https://insights.sbomify.com/CVE-2018-5237/): Privilege escalation in Symantec Endpoint Protection (high 8.8)
- [CVE-2020-5836](https://insights.sbomify.com/CVE-2020-5836/): Privilege escalation in Symantec Endpoint Protection (high 7.8)
- [CVE-2020-5837](https://insights.sbomify.com/CVE-2020-5837/): Path traversal in Symantec Endpoint Protection (high 7.8)
- [CVE-2020-5820](https://insights.sbomify.com/CVE-2020-5820/): Privilege escalation in Symantec Endpoint Protection (SEP) and Symantec Endpoint Protection Small Business Edition (SEP SBE) (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-18366 and fix it if it is affected.

What it is: CVE-2018-18366 is a medium-severity vulnerability in Symantec Endpoint Protection, published on 25 Apr 2019. 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-2018-18366 in the wild and no public exploit code.

Affected product: Symantec Endpoint Protection. 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-2018-18366/ (Markdown: https://insights.sbomify.com/CVE-2018-18366/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-18366
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-18366
- OSV: https://osv.dev/vulnerability/CVE-2018-18366

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-18366/
Summaries are generated and may contain mistakes; the official description above is the record.