# CVE-2018-5711: Denial of service in n/a

> An attacker can cause a denial of service via infinite loop in libgd when processing crafted GIF files, affecting PHP applications.

- **Severity:** Medium 5.5 (`CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 16 Jan 2018
- **Updated:** 5 Aug 2024
- **Also known as:** ALPINE-CVE-2018-5711, DEBIAN-CVE-2018-5711, DLA-1248-1, GHSA-qwqg-rff2-45cw, SUSE-SU-2018:0235-1, SUSE-SU-2018:0260-1, UBUNTU-CVE-2018-5711

## What is CVE-2018-5711?

CVE-2018-5711 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 16 Jan 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

gd_gif_in.c in the GD Graphics Library (aka libgd), as used in PHP before 5.6.33, 7.0.x before 7.0.27, 7.1.x before 7.1.13, and 7.2.x before 7.2.1, has an integer signedness error that leads to an infinite loop via a crafted GIF file, as demonstrated by a call to the imagecreatefromgif or imagecreatefromstring PHP function. This is related to GetCode_ and gdImageCreateFromGifCtx.

Weakness: CWE-835 (Loop with Unreachable Exit Condition), CWE-681 (Incorrect Conversion between Numeric Types)

## Which versions are affected by CVE-2018-5711?

It affects 3 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `gd` | SUSE:Linux Enterprise Desktop 12 SP2 | All versions | 2.1.0-24.6.1 |
| `gd` | SUSE:Linux Enterprise Desktop 12 SP3 | All versions | 2.1.0-24.6.1 |
| `gd` | SUSE:Linux Enterprise Server 11 SP4 | All versions | 2.0.36.RC1-52.33.5.1 |
| `gd` | SUSE:Linux Enterprise Server 12 SP2 | All versions | 2.1.0-24.6.1 |
| `gd` | SUSE:Linux Enterprise Server 12 SP3 | All versions | 2.1.0-24.6.1 |
| `gd` | SUSE:Linux Enterprise Server for Raspberry Pi 12 SP2 | All versions | 2.1.0-24.6.1 |
| `gd` | SUSE:Linux Enterprise Server for SAP Applications 11 SP4 | All versions | 2.0.36.RC1-52.33.5.1 |
| `gd` | SUSE:Linux Enterprise Server for SAP Applications 12 SP2 | All versions | 2.1.0-24.6.1 |
| `gd` | SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 2.1.0-24.6.1 |
| `gd` | SUSE:Linux Enterprise Software Development Kit 11 SP4 | All versions | 2.0.36.RC1-52.33.5.1 |
| `gd` | SUSE:Linux Enterprise Software Development Kit 12 SP2 | All versions | 2.1.0-24.6.1 |
| `gd` | SUSE:Linux Enterprise Software Development Kit 12 SP3 | All versions | 2.1.0-24.6.1 |
| `gd` | SUSE:Linux Enterprise Workstation Extension 12 SP2 | All versions | 2.1.0-24.6.1 |
| `gd` | SUSE:Linux Enterprise Workstation Extension 12 SP3 | All versions | 2.1.0-24.6.1 |

Products: Canonical Ubuntu Linux, Debian Debian Linux, Php Php.

## How do I fix CVE-2018-5711?

Upgrade to a fixed version.

## Is CVE-2018-5711 being exploited?

There is no known exploitation of CVE-2018-5711 in the wild and no public exploit code.

Public exploit code:

- https://github.com/huzhenghui/Test-7-2-0-PHP-CVE-2018-5711 (github_poc): https://github.com/huzhenghui/Test-7-2-0-PHP-CVE-2018-5711
- https://github.com/huzhenghui/Test-7-2-1-PHP-CVE-2018-5711 (github_poc): https://github.com/huzhenghui/Test-7-2-1-PHP-CVE-2018-5711

## 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-2018-5711 and fix it if it is affected.

What it is: CVE-2018-5711 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 16 Jan 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-5711 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-2018-5711/ (Markdown: https://insights.sbomify.com/CVE-2018-5711/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-5711
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-5711
- OSV: https://osv.dev/vulnerability/CVE-2018-5711

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-5711/
Summaries are generated and may contain mistakes; the official description above is the record.