# CVE-2018-4218: Use after free in n/a

> Remote attackers can execute arbitrary code or cause denial of service via a crafted website exploiting a use-after-free in WebKit.

- **Severity:** High 8.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 8 Jun 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-4218, GHSA-v4g5-82wj-3j9w, UBUNTU-CVE-2018-4218

## What is CVE-2018-4218?

CVE-2018-4218 is a high-severity use after free vulnerability in Apple Icloud, published on 8 Jun 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

An issue was discovered in certain Apple products. iOS before 11.4 is affected. Safari before 11.1.1 is affected. iCloud before 7.5 on Windows is affected. iTunes before 12.7.5 on Windows is affected. tvOS before 11.4 is affected. watchOS before 4.3.1 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site that triggers an @generatorState use-after-free.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2018-4218?

It affects 7 products.


Products: Apple Icloud, Apple Iphone Os, Apple Itunes, Apple Safari, Apple Tvos, Apple Watchos, Canonical Ubuntu Linux.

## How do I fix CVE-2018-4218?

Upgrade to a fixed version.

## Is CVE-2018-4218 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-4218 exists.

Public exploit code:

- WebKit - Use-After-Free when Resuming Generator (exploitdb)

## Other vulnerabilities in Apple Icloud

- [CVE-2019-8506](https://insights.sbomify.com/CVE-2019-8506/): Apple Multiple Products Type Confusion (high 8.8, exploited in the wild)
- [CVE-2020-27932](https://insights.sbomify.com/CVE-2020-27932/): Apple Multiple Products Type Confusion (high 7.8, exploited in the wild)
- [CVE-2019-8746](https://insights.sbomify.com/CVE-2019-8746/): Memory corruption in iOS (critical 9.8)
- [CVE-2019-8749](https://insights.sbomify.com/CVE-2019-8749/): Memory corruption in iOS (critical 9.8)
- [CVE-2019-8756](https://insights.sbomify.com/CVE-2019-8756/): Memory corruption in iOS (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-4218 and fix it if it is affected.

What it is: CVE-2018-4218 is a high-severity use after free vulnerability in Apple Icloud, published on 8 Jun 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-4218 exists.

Affected product: Apple Icloud. 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-2018-4218/ (Markdown: https://insights.sbomify.com/CVE-2018-4218/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-4218
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-4218
- OSV: https://osv.dev/vulnerability/CVE-2018-4218

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-4218/
Summaries are generated and may contain mistakes; the official description above is the record.