GHSA-p9v8-q5m4-pf46

Source

https://github.com/advisories/GHSA-p9v8-q5m4-pf46

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/01/GHSA-p9v8-q5m4-pf46/GHSA-p9v8-q5m4-pf46.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-p9v8-q5m4-pf46

Aliases

Related

CVE-2024-5138

Published

2025-01-16T17:19:07Z

Modified

2025-01-16T17:26:50.347603Z

Severity

4.0 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator

Summary

CVE-2024-5138: snapd snapctl auth bypass

Details

Impact

A snap with prior permissions to create a mount entry on the host, such as firefox, normally uses the permission from one of the per-snap hook programs. A unprivileged users cannot normally trigger that behaviour by using snap run --shell firefox followed by snapctl mount, since snapd validates the requesting user identity (root or non-root). The issue allows unprivileged users to bypass that check by crafting a malicious command line vector which confuses snapd into thinking the help message is requested.

Unprivileged user on a default installation of Ubuntu, where firefox is as provided as a snap, may cause a denial-of-service attack by repeatedly mounting hunspell database over and over and eventually exhausting system memory.

Other attacks, reliant on the same underying mechanism (mount), are possible. In all cases the snap must be installed and grated permission to perform this action (by connecting an appropriate snap interface), which requires administrative privileges. As such we are focusing on the case of default installation where an unprivileged user may exploit this behavior.

Patches

Patch: https://github.com/canonical/snapd/commit/68ee9c6aa916ab87dbfd9a26030690f2cabf1e14 Release: Available from Snapd 2.64

Workarounds

Users may disconnect any instances of the mount-control interface to prevent snapd from creating such mount points. For example, the firefox snap has the host-hunspell plug, which is of type mount-control. The interface can be disconnected with:

sudo snap disconnect firefox:host-hunspell

References

The original bug report was made on Launchpad: https://bugs.launchpad.net/snapd/+bug/2065077 CVE.org: https://www.cve.org/CVERecord?id=CVE-2024-5138 Canonical: https://ubuntu.com/security/CVE-2024-5138

Database specific

{
    "nvd_published_at": null,
    "cwe_ids": [
        "CWE-285"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2025-01-16T17:19:07Z"
}

References

Affected packages

Go / github.com/snapcore/snapd

Package

Name: github.com/snapcore/snapd; View open source insights on deps.dev
Purl: pkg:golang/github.com/snapcore/snapd

Affected ranges

Type: SEMVER
Events: Introduced

2.51.6

Fixed

2.63.1

Go / github.com/snapcore/snapd

Package

Name: github.com/snapcore/snapd; View open source insights on deps.dev
Purl: pkg:golang/github.com/snapcore/snapd

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

0.0.0-20240524114846-68ee9c6aa916