# CVE-2019-12450: Race condition in n/a

> A race condition in GLib's file copy function allows attackers to read or modify files due to improper permission restrictions during the operation.

- **Severity:** Critical 9.8 (`CVSS:3.1/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:** 29 May 2019
- **Updated:** 4 Aug 2024
- **Also known as:** ALPINE-CVE-2019-12450, AZL-6434, CLEANSTART-2026-SB14639, DEBIAN-CVE-2019-12450, DLA-1826-1, GHSA-m54p-gqx6-f2r7, JLSEC-2025-153, MGASA-2019-0352, RHSA-2019:3530, SUSE-SU-2019:14102-1, SUSE-SU-2019:1594-1, UBUNTU-CVE-2019-12450, USN-4014-1, USN-4014-2, openSUSE-SU-2019:1650-1

## What is CVE-2019-12450?

CVE-2019-12450 is a critical vulnerability in Canonical Ubuntu Linux, published on 29 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

file_copy_fallback in gio/gfile.c in GNOME GLib 2.15.0 through 2.61.1 does not properly restrict file permissions while a copy operation is in progress. Instead, default permissions are used.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization), CWE-276 (Incorrect Default Permissions)

## Which versions are affected by CVE-2019-12450?

It affects 9 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `glib2` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-7.el8 |
| `glib2-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-7.el8 |
| `glib2-debugsource` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-7.el8 |
| `glib2-devel` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-7.el8 |
| `glib2-devel-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-7.el8 |
| `glib2-fam` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-7.el8 |
| `glib2-fam-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-7.el8 |
| `glib2-tests` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-7.el8 |
| `glib2-tests-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:2.56.4-7.el8 |
| `glib2-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-7.el8 |
| `glib2-debugsource` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-7.el8 |
| `glib2-devel-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-7.el8 |
| `glib2-doc` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-7.el8 |
| `glib2-fam-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-7.el8 |
| `glib2-static` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-7.el8 |
| `glib2-tests-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:2.56.4-7.el8 |
| `glib2` | SUSE:Linux Enterprise Module for Basesystem 15 | All versions | 2.54.3-4.15.1 |
| `glib2` | SUSE:Linux Enterprise Module for Basesystem 15 SP1 | All versions | 2.54.3-4.15.1 |
| `glib2` | SUSE:Linux Enterprise Module for Package Hub 15 | All versions | 2.54.3-4.15.1 |
| `glib2` | SUSE:Linux Enterprise Point of Sale 11 SP3 | All versions | 2.22.5-0.8.39.1 |
| `glib2` | SUSE:Linux Enterprise Server 11 SP4-LTSS | All versions | 2.22.5-0.8.39.1 |
| `glib2` | openSUSE:Leap 15.0 | All versions | 2.54.3-lp150.3.10.1 |

Products: Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Gnome Glib, Opensuse Leap, Redhat Enterprise Linux, Redhat Enterprise Linux Eus, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Server Tus.

## How do I fix CVE-2019-12450?

Apply the vendor's patch.

## Is CVE-2019-12450 being exploited?

There is no known exploitation of CVE-2019-12450 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-2019-12450 and fix it if it is affected.

What it is: CVE-2019-12450 is a critical vulnerability in Canonical Ubuntu Linux, published on 29 May 2019. 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-2019-12450 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-2019-12450/ (Markdown: https://insights.sbomify.com/CVE-2019-12450/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-12450
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-12450
- OSV: https://osv.dev/vulnerability/CVE-2019-12450

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-12450/
Summaries are generated and may contain mistakes; the official description above is the record.