# CVE-2018-7225: Integer overflow in n/a

> Attackers can trigger an integer overflow in LibVNCServer via crafted packets, leading to access to sensitive uninitialized data or service disruption.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/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:** Not needed
- **Fix available:** Yes
- **Published:** 19 Feb 2018
- **Updated:** 5 Aug 2024
- **Also known as:** ALPINE-CVE-2018-7225, DEBIAN-CVE-2018-7225, DLA-1332-1, DSA-4221-1, GHSA-2v5x-9xhg-52hm, MGASA-2018-0198, RHSA-2018:1055, SUSE-SU-2018:0875-1, UBUNTU-CVE-2018-7225, USN-3618-1

## What is CVE-2018-7225?

CVE-2018-7225 is a critical vulnerability in Canonical Ubuntu Linux, published on 19 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in LibVNCServer through 0.9.11. rfbProcessClientNormalMessage() in rfbserver.c does not sanitize msg.cct.length, leading to access to uninitialized and potentially sensitive data or possibly unspecified other impact (e.g., an integer overflow) via specially crafted VNC packets.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2018-7225?

It affects 9 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `libvncserver` | Red Hat:enterprise_linux:7::client | All versions | 0:0.9.9-12.el7_5 |
| `libvncserver-debuginfo` | Red Hat:enterprise_linux:7::client | All versions | 0:0.9.9-12.el7_5 |
| `libvncserver-devel` | Red Hat:enterprise_linux:7::client | All versions | 0:0.9.9-12.el7_5 |
| `libvncserver` | Red Hat:enterprise_linux:7::server | All versions | 0:0.9.9-12.el7_5 |
| `libvncserver-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 0:0.9.9-12.el7_5 |
| `libvncserver-devel` | Red Hat:enterprise_linux:7::server | All versions | 0:0.9.9-12.el7_5 |
| `libvncserver` | Red Hat:enterprise_linux:7::workstation | All versions | 0:0.9.9-12.el7_5 |
| `libvncserver-debuginfo` | Red Hat:enterprise_linux:7::workstation | All versions | 0:0.9.9-12.el7_5 |
| `libvncserver-devel` | Red Hat:enterprise_linux:7::workstation | All versions | 0:0.9.9-12.el7_5 |
| `LibVNCServer` | SUSE:Linux Enterprise Server 11 SP4 | All versions | 0.9.1-160.3.1 |
| `LibVNCServer` | SUSE:Linux Enterprise Server for SAP Applications 11 SP4 | All versions | 0.9.1-160.3.1 |
| `LibVNCServer` | SUSE:Linux Enterprise Software Development Kit 11 SP4 | All versions | 0.9.1-160.3.1 |

Products: Canonical Ubuntu Linux, Debian Debian Linux, Libvncserver Project Libvncserver, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Server Eus, Redhat Enterprise Linux Server Tus, Redhat Enterprise Linux Workstation.

## How do I fix CVE-2018-7225?

Apply the vendor's patch.

## Is CVE-2018-7225 being exploited?

There is no known exploitation of CVE-2018-7225 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-7225 and fix it if it is affected.

What it is: CVE-2018-7225 is a critical vulnerability in Canonical Ubuntu Linux, published on 19 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-2018-7225 in the wild and no public exploit code.

Affected product: Canonical Ubuntu 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-2018-7225/ (Markdown: https://insights.sbomify.com/CVE-2018-7225/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-7225
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-7225
- OSV: https://osv.dev/vulnerability/CVE-2018-7225

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-7225/
Summaries are generated and may contain mistakes; the official description above is the record.