CVE-2024-29069 snapd will follow archived symlinks when unpacking a filesystem
An attacker can trick users into installing a malicious snap to read privileged files via symlink following, exposing sensitive data to unprivileged users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2024-29069?
CVE-2024-29069 is a medium-severity path traversal vulnerability in Canonical snapd, published on 25 Jul 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In snapd versions prior to 2.62, snapd failed to properly check the destination of symbolic links when extracting a snap. The snap format is a squashfs file-system image and so can contain symbolic links and other file types. Various file entries within the snap squashfs image (such as icons and desktop files etc) are directly read by snapd when it is extracted. An attacker who could convince a user to install a malicious snap which contained symbolic links at these paths could then cause snapd to write out the contents of the symbolic link destination into a world-readable directory. This in-turn could allow an unprivileged user to gain access to privileged information.
Which versions are affected by CVE-2024-29069?
3 open source packages ship an affected version, including github.com/snapcore/snapd. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/snapcore/snapd Go | All versions | None |
github.com/snapcore/snapd Go | All versions | 2.62 |
github.com/snapcore/snapd Go | All versions | 2.62 |
Products include Canonical Snapd.
How do I fix CVE-2024-29069?
Upgrade github.com/snapcore/snapd to 2.62 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2024-29069 being exploited?
There is no known exploitation of CVE-2024-29069 in the wild and no public exploit code.
Other vulnerabilities in Canonical snapd
- CVE-2023-1523 Command injection in snapd
- CVE-2020-27352 Privilege escalation in snapd
- CVE-2019-7304 Local privilege escalation via snapd socket
- CVE-2021-4120 snapd could be made to bypass intended access restrictions through snap content interfaces and layout paths
- CVE-2024-5138 CVE-2024-5138: snapd snapctl auth bypass
Sources
Also known as DEBIAN-CVE-2024-29069, GHSA-69p6-gp5x-j269, GO-2024-3009, UBUNTU-CVE-2024-29069.