CVE-2024-5138: snapd Input Validation Flaw

Description

The snapctl component within snapd allows a confined snap to interact with the snapd daemon to take certain privileged actions on behalf of the snap. It was found that snapctl did not properly parse command-line arguments, allowing an unprivileged user to trigger an authorised action on behalf of the snap that would normally require administrator privileges to perform. This could possibly allow an unprivileged user to perform a denial of service or similar.

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CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Weakness Type (CWE)

CWE-20 Improper Input Validation

Affected Products

Vendor	Product	Versions
canonical	snapd	2.51.6 — 2.63.1

References

Advisories & Patches

https://bugs.launchpad.net/snapd/+bug/2065077 https://github.com/snapcore/snapd/commit/68ee9c6aa916ab87dbfd9a26030690f2cabf1e14 https://github.com/snapcore/snapd/security/advisories/GHSA-p9v8-q5m4-pf46 https://bugs.launchpad.net/snapd/+bug/2065077 https://github.com/snapcore/snapd/commit/68ee9c6aa916ab87dbfd9a26030690f2cabf1e14 https://github.com/snapcore/snapd/security/advisories/GHSA-p9v8-q5m4-pf46

Exploits

https://bugs.launchpad.net/snapd/+bug/2065077 https://bugs.launchpad.net/snapd/+bug/2065077

Other References

https://www.cve.org/CVERecord?id=CVE-2024-5138 https://www.cve.org/CVERecord?id=CVE-2024-5138

Frequently Asked Questions

What is CVE-2024-5138? +

The snapctl component within snapd allows a confined snap to interact with the snapd daemon to take certain privileged actions on behalf of the snap. It was found that snapctl did not properly parse command-line arguments, allowing an unprivileged user to trigger an authorised action on behalf of the snap that would normally require administrator privileges to perform. This could possibly allow an unprivileged user to perform a denial of service or similar. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2024-5138? +

CVE-2024-5138 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-5138? +

CVE-2024-5138 affects products from canonical, specifically: snapd. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-5138? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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