CVE-2024-1724: snapd Permission Flaw

Description

In snapd versions prior to 2.62, when using AppArmor for enforcement of sandbox permissions, snapd failed to restrict writes to the $HOME/bin path. In Ubuntu, when this path exists, it is automatically added to the users PATH. An attacker who could convince a user to install a malicious snap which used the 'home' plug could use this vulnerability to install arbitrary scripts into the users PATH which may then be run by the user outside of the expected snap sandbox and hence allow them to escape confinement.

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CVSS v3.1 Score

6.3

MEDIUM

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

Weakness Type (CWE)

CWE-732 CWE-732

Affected Products

Vendor	Product	Versions
canonical	snapd	< 2.62

References

Advisories & Patches

https://github.com/snapcore/snapd/commit/aa191f97713de8dc3ce3ac818539f0b976eb8ef6 https://github.com/snapcore/snapd/pull/13689 https://github.com/snapcore/snapd/commit/aa191f97713de8dc3ce3ac818539f0b976eb8ef6 https://github.com/snapcore/snapd/pull/13689

Exploits

https://gld.mcphail.uk/posts/explaining-cve-2024-1724/ https://gld.mcphail.uk/posts/explaining-cve-2024-1724/

Frequently Asked Questions

What is CVE-2024-1724? +

In snapd versions prior to 2.62, when using AppArmor for enforcement of sandbox permissions, snapd failed to restrict writes to the $HOME/bin path. In Ubuntu, when this path exists, it is automatically added to the users PATH. An attacker who could convince a user to install a malicious snap which used the 'home' plug could use this vulnerability to install arbitrary scripts into the users PATH which may then be run by the user outside of the expected snap sandbox and hence allow them to escape confinement. It has a CVSS v3.1 base score of 6.3 (MEDIUM).

How severe is CVE-2024-1724? +

CVE-2024-1724 has a CVSS v3.1 score of 6.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-1724? +

CVE-2024-1724 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-2024-1724? +

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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