# CVE-2019-11038: Uninitialized read in gdImageCreateFromXbm

> An attacker can trigger an uninitialized read in the GD library to disclose stack memory contents via the PHP GD extension.

- **Severity:** Low 3.1 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N`)
- **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:** 18 Jun 2019
- **Updated:** 16 Sep 2024
- **Also known as:** ALPINE-CVE-2019-11038, DEBIAN-CVE-2019-11038, DLA-1817-1, GHSA-8v67-h8jw-j3r2, MGASA-2020-0134, UBUNTU-CVE-2019-11038

## What is CVE-2019-11038?

CVE-2019-11038 is a low-severity vulnerability in Canonical Ubuntu Linux, published on 18 Jun 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

When using the gdImageCreateFromXbm() function in the GD Graphics Library (aka LibGD) 2.2.5, as used in the PHP GD extension in PHP versions 7.1.x below 7.1.30, 7.2.x below 7.2.19 and 7.3.x below 7.3.6, it is possible to supply data that will cause the function to use the value of uninitialized variable. This may lead to disclosing contents of the stack that has been left there by previous code.

Weakness: CWE-908 (Use of Uninitialized Resource), CWE-457 (Use of Uninitialized Variable)

## Which versions are affected by CVE-2019-11038?

It affects 13 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Libgd Libgd, Opensuse Leap, Php Php, Redhat Enterprise Linux, Redhat Software Collections, Suse Linux Enterprise Debuginfo, Suse Linux Enterprise Desktop, Suse Linux Enterprise Server, Suse Linux Enterprise Software Development Kit, Suse Linux Enterprise Workstation Extension.

## How do I fix CVE-2019-11038?

Upgrade to a fixed version.

## Is CVE-2019-11038 being exploited?

There is no known exploitation of CVE-2019-11038 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-2019-11038 and fix it if it is affected.

What it is: CVE-2019-11038 is a low-severity vulnerability in Canonical Ubuntu Linux, published on 18 Jun 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: There is no known exploitation of CVE-2019-11038 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-2019-11038/ (Markdown: https://insights.sbomify.com/CVE-2019-11038/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-11038
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-11038
- OSV: https://osv.dev/vulnerability/CVE-2019-11038

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-11038/
Summaries are generated and may contain mistakes; the official description above is the record.