CVE-2024-6923 Email header injection due to unquoted newlines
Medium 5.5
Published
Updated
Check this codebase for CVE-2024-6923 and fix it if it is affected.
What it is: CVE-2024-6923 is a medium-severity code injection vulnerability in CPython, published on 1 Aug 2024. Any signed-in user can exploit it over the network, 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-2024-6923 exists.
Affected packages and fixed versions:
- libpython (Bitnami): affected all versions; fixed in 3.8.20, 3.9.20, 3.10.15, 3.11.10, 3.12.5
- python (Bitnami): affected all versions; fixed in 3.8.20, 3.9.20, 3.10.15, 3.11.10, 3.12.5
- python-min (Bitnami): affected all versions; fixed in 3.8.20, 3.9.20, 3.10.15, 3.11.10, 3.12.5
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-2024-6923/ (Markdown: https://insights.sbomify.com/CVE-2024-6923/index.md)
Attackers can inject arbitrary headers into emails by exploiting improper newline quoting in the Python email module during serialization.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2024-6923?
CVE-2024-6923 is a medium-severity code injection vulnerability in CPython, published on 1 Aug 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
There is a MEDIUM severity vulnerability affecting CPython.
The email module didn’t properly quote newlines for email headers when serializing an email message allowing for header injection when an email is serialized.
Weakness: CWE-94
Which versions are affected by CVE-2024-6923?
3 open source packages ship an affected version, including libpython, python and python-min.
| Package | Affected | Fixed in |
|---|---|---|
libpython Bitnami | All versions | 3.8.20, 3.9.20, 3.10.15, 3.11.10, 3.12.5 |
python Bitnami | All versions | 3.8.20, 3.9.20, 3.10.15, 3.11.10, 3.12.5 |
python-min Bitnami | All versions | 3.8.20, 3.9.20, 3.10.15, 3.11.10, 3.12.5 |
Linux distribution packages (37)
python-unversioned-command AlmaLinux:9 | All versions | 3.9.18-3.el9_4.5 |
python3 AlmaLinux:9 | All versions | 3.9.18-3.el9_4.5 |
python3-debug AlmaLinux:9 | All versions | 3.9.18-3.el9_4.5 |
python3-devel AlmaLinux:9 | All versions | 3.9.18-3.el9_4.5 |
python3-idle AlmaLinux:9 | All versions | 3.9.18-3.el9_4.5 |
python3-libs AlmaLinux:9 | All versions | 3.9.18-3.el9_4.5 |
python3-test AlmaLinux:9 | All versions | 3.9.18-3.el9_4.5 |
python3-tkinter AlmaLinux:9 | All versions | 3.9.18-3.el9_4.5 |
python3.11 AlmaLinux:9 | All versions | 3.11.7-1.el9_4.5 |
python3.11-debug AlmaLinux:9 | All versions | 3.11.7-1.el9_4.5 |
python3.11-devel AlmaLinux:9 | All versions | 3.11.7-1.el9_4.5 |
python3.11-idle AlmaLinux:9 | All versions | 3.11.7-1.el9_4.5 |
python3.11-libs AlmaLinux:9 | All versions | 3.11.7-1.el9_4.5 |
python3.11-test AlmaLinux:9 | All versions | 3.11.7-1.el9_4.5 |
python3.11-tkinter AlmaLinux:9 | All versions | 3.11.7-1.el9_4.5 |
python3.12 AlmaLinux:9 | All versions | 3.12.1-4.el9_4.3 |
python3.12-debug AlmaLinux:9 | All versions | 3.12.1-4.el9_4.3 |
python3.12-devel AlmaLinux:9 | All versions | 3.12.1-4.el9_4.3 |
python3.12-idle AlmaLinux:9 | All versions | 3.12.1-4.el9_4.3 |
python3.12-libs AlmaLinux:9 | All versions | 3.12.1-4.el9_4.3 |
python3.12-test AlmaLinux:9 | All versions | 3.12.1-4.el9_4.3 |
python3.12-tkinter AlmaLinux:9 | All versions | 3.12.1-4.el9_4.3 |
python3.11 Red Hat:enterprise_linux:9::appstream | All versions | 0:3.11.7-1.el9_4.5 |
python3.11-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:3.11.7-1.el9_4.5 |
python3.11-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 0:3.11.7-1.el9_4.5 |
python3.11-devel Red Hat:enterprise_linux:9::appstream | All versions | 0:3.11.7-1.el9_4.5 |
python3.11-libs Red Hat:enterprise_linux:9::appstream | All versions | 0:3.11.7-1.el9_4.5 |
python3.11-tkinter Red Hat:enterprise_linux:9::appstream | All versions | 0:3.11.7-1.el9_4.5 |
python3.12 Red Hat:enterprise_linux:9::appstream | All versions | 0:3.12.1-4.el9_4.3 |
python3.12-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:3.12.1-4.el9_4.3 |
python3.12-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 0:3.12.1-4.el9_4.3 |
python3.12-devel Red Hat:enterprise_linux:9::appstream | All versions | 0:3.12.1-4.el9_4.3 |
python3.12-libs Red Hat:enterprise_linux:9::appstream | All versions | 0:3.12.1-4.el9_4.3 |
python3.12-tkinter Red Hat:enterprise_linux:9::appstream | All versions | 0:3.12.1-4.el9_4.3 |
python3.11 Red Hat:enterprise_linux:9::crb | All versions | 0:3.11.7-1.el9_4.5 |
python3.11-debug Red Hat:enterprise_linux:9::crb | All versions | 0:3.11.7-1.el9_4.5 |
python3.11-debuginfo Red Hat:enterprise_linux:9::crb | All versions | 0:3.11.7-1.el9_4.5 |
How do I fix CVE-2024-6923?
Upgrade libpython to a fixed version for your release line: 3.8.20, 3.9.20, 3.10.15 or 3.11.10.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2024-6923 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-6923 exists.
Sources
Also known as ALPINE-CVE-2024-6923, ALSA-2024:6146, ALSA-2024:6163, ALSA-2024:6179, AZL-47346, AZL-47367 and 27 more.