CVE-2024-5300
AppArmor Base Profile Misconfiguration in snapd Permits Confined Snaps Unauthorized Access to Hashed Passwords via systemd-userdbd
Description
An access control bypass and information disclosure vulnerability exists in the base AppArmor security profile configuration of Canonical snapd. The abstraction rules located in /etc/apparmor.d/abstractions/nss-systemd (inherited via ) inadvertently permit strictly confined snap applications, which lack the privileged account-control interface, to interact directly with the io.systemd.Multiplexer and io.systemd.NameServiceSwitch UNIX domain sockets under /run/systemd/userdb/. On systems where the systemd-userdbd service is installed and operational, the service fails to distinguish between an unconfined root user on the host system and a restricted root user running within a snap application's sandbox (such as a daemon or configuration hook). Because systemd-userdbd returns "complete" user records—including sensitive hashed user passwords from /etc/shadow—when queried by a process running as root, a compromised or malicious strictly confined snap executing code as root can successfully query the Varlink interface to retrieve all system password hashes, bypassing intended snap sandbox restrictions. This issue is mitigated by the fact that systemd-userdbd is not installed by default on standard Ubuntu deployments.
INFO
Published Date :
July 21, 2026, 3:16 p.m.
Last Modified :
July 21, 2026, 3:16 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2024-5300
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | cc1ad9ee-3454-478d-9317-d3e869d708bc | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update snapd to the latest secure version.
- Review and adjust AppArmor profiles if needed.
- Ensure systemd-userdbd is not exposed to snaps.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-5300.
| URL | Resource |
|---|---|
| https://ubuntu.com/security/CVE-2024-5300 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-5300 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-5300
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-5300 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-5300 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Jul. 21, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/canonical/snapd/', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.76.1', 'versionType': 'semver'}], 'packageName': 'snapd', 'collectionURL': 'https://github.com/canonical', 'defaultStatus': 'unaffected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 26.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.76+ubuntu26.04.3', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/resolute', 'defaultStatus': 'affected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 24.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.76+ubuntu24.04.1', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/noble', 'defaultStatus': 'affected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 22.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.76+ubuntu22.04.1', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/jammy', 'defaultStatus': 'affected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 20.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.67.1+20.04ubuntu1~esm2', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/focal', 'defaultStatus': 'affected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 18.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.61.4ubuntu0.18.04.1+esm3', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/bionic', 'defaultStatus': 'affected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 16.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.61.4ubuntu0.16.04.1+esm3'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/xenial', 'defaultStatus': 'affected'}] Added Description An access control bypass and information disclosure vulnerability exists in the base AppArmor security profile configuration of Canonical snapd. The abstraction rules located in /etc/apparmor.d/abstractions/nss-systemd (inherited via ) inadvertently permit strictly confined snap applications, which lack the privileged account-control interface, to interact directly with the io.systemd.Multiplexer and io.systemd.NameServiceSwitch UNIX domain sockets under /run/systemd/userdb/. On systems where the systemd-userdbd service is installed and operational, the service fails to distinguish between an unconfined root user on the host system and a restricted root user running within a snap application's sandbox (such as a daemon or configuration hook). Because systemd-userdbd returns "complete" user records—including sensitive hashed user passwords from /etc/shadow—when queried by a process running as root, a compromised or malicious strictly confined snap executing code as root can successfully query the Varlink interface to retrieve all system password hashes, bypassing intended snap sandbox restrictions. This issue is mitigated by the fact that systemd-userdbd is not installed by default on standard Ubuntu deployments. Added CVSS V3.1 AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N Added CWE CWE-212 Added Reference https://ubuntu.com/security/CVE-2024-5300