# CVE-2018-4312: Use after free in iOS, tvOS, Safari, iTunes for Windows, iCloud for Windows

> A use-after-free vulnerability in Apple products allows attackers to execute arbitrary code via improved memory management fixes.

- **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:** 3 Apr 2019
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-4312, GHSA-q6fg-h4rh-65xx, UBUNTU-CVE-2018-4312

## What is CVE-2018-4312?

CVE-2018-4312 is a high-severity use after free vulnerability in Apple Icloud, published on 3 Apr 2019. 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

A use after free issue was addressed with improved memory management. This issue affected versions prior to iOS 12, tvOS 12, Safari 12, iTunes 12.9 for Windows, iCloud for Windows 7.7.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2018-4312?

It affects 5 products.


Products: Apple Icloud, Apple Iphone Os, Apple Itunes, Apple Safari, Apple Tvos.

## How do I fix CVE-2018-4312?

Upgrade to a fixed version.

## Is CVE-2018-4312 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-4312 exists.

Public exploit code:

- WebKit - 'WebCore::AXObjectCache::handleMenuItemSelected' Use-After-Free (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-2018-4312 and fix it if it is affected.

What it is: CVE-2018-4312 is a high-severity use after free vulnerability in Apple Icloud, published on 3 Apr 2019. 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-2018-4312 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-2018-4312/ (Markdown: https://insights.sbomify.com/CVE-2018-4312/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-4312
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-4312
- OSV: https://osv.dev/vulnerability/CVE-2018-4312

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-4312/
Summaries are generated and may contain mistakes; the official description above is the record.