CVE-2024-29068: snapd Input Validation Flaw — Fix

Description

In snapd versions prior to 2.62, snapd failed to properly check the file type when extracting a snap. The snap format is a squashfs file-system image and so can contain files that are non-regular files (such as pipes or sockets etc). Various file entries within the snap squashfs image (such as icons etc) are directly read by snapd when it is extracted. An attacker who could convince a user to install a malicious snap which contained non-regular files at these paths could then cause snapd to block indefinitely trying to read from such files and cause a denial of service.

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CVSS v3.1 Score

5.8

MEDIUM

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

Weakness Type (CWE)

CWE-20 Improper Input Validation

Affected Products

Vendor	Product	Versions
canonical	snapd	< 2.62

References

Advisories & Patches

https://github.com/snapcore/snapd/commit/b66fee81606a1c05f965a876ccbaf44174194063 https://github.com/snapcore/snapd/pull/13682 https://github.com/snapcore/snapd/commit/b66fee81606a1c05f965a876ccbaf44174194063 https://github.com/snapcore/snapd/pull/13682

Frequently Asked Questions

What is CVE-2024-29068? +

In snapd versions prior to 2.62, snapd failed to properly check the file type when extracting a snap. The snap format is a squashfs file-system image and so can contain files that are non-regular files (such as pipes or sockets etc). Various file entries within the snap squashfs image (such as icons etc) are directly read by snapd when it is extracted. An attacker who could convince a user to install a malicious snap which contained non-regular files at these paths could then cause snapd to block indefinitely trying to read from such files and cause a denial of service. It has a CVSS v3.1 base score of 5.8 (MEDIUM).

How severe is CVE-2024-29068? +

CVE-2024-29068 has a CVSS v3.1 score of 5.8 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-2024-29068? +

CVE-2024-29068 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-2024-29068? +

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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