canonical snapd vulnerabilities and exploits

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7.5

CVSSv3

snap-confine in snapd before 2.38 incorrectly set the ownership of a snap application to the uid and gid of the first calling user. Consequently, that user had unintended access to a private /tmp directory....

Canonical Snapd

5.5

CVSSv3

snapd 2.54.2 and earlier created ~/snap directories in user home directories without specifying owner-only permissions. This could allow a local attacker to read information that should have been private. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1...

Canonical Snapd Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 21.101 Article available

7.5

CVSSv3

snap-confine as included in snapd before 2.39 did not guard against symlink races when performing the chdir() to the current working directory of the calling user, aka a "cwd restore permission bypass."...

Canonical Snapd

7.5

CVSSv3

A vulnerability in the seccomp filters of Canonical snapd before version 2.37.4 allows a strict mode snap to insert characters into a terminal on a 64-bit host. The seccomp rules were generated to match 64-bit ioctl(2) commands on a 64-bit platform; however, the Linux kernel...

Canonical Snapd Canonical Ubuntu Linux 14.04 Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 16.04 Canonical Ubuntu Linux 18.101 EDB exploit available

7.8

CVSSv3

snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement. Fixed in...

Canonical Snapd Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 21.10 Fedoraproject Fedora 34 Fedoraproject Fedora 351 Article available

6.8

CVSSv3

cloud-init as managed by snapd on Ubuntu Core 16 and Ubuntu Core 18 devices was run without restrictions on every boot, which a physical attacker could exploit by crafting cloud-init user-data/meta-data via external media to perform arbitrary changes on the device to bypass...

Canonical Snapd Canonical Ubuntu Linux 16.04 Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 19.10 Canonical Ubuntu Linux 20.04

9.8

CVSSv3

Canonical snapd before version 2.37.1 incorrectly performed socket owner validation, allowing an attacker to run arbitrary commands as root. This issue affects: Canonical snapd versions prior to 2.37.1....

Canonical Snapd Canonical Ubuntu Linux 16.04 Canonical Ubuntu Linux 14.04 Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 18.102 EDB exploits available30 Github repositories available3 Articles available

8.8

CVSSv3

snapd 2.54.2 did not properly validate the location of the snap-confine binary. A local attacker who can hardlink this binary to another location to cause snap-confine to execute other arbitrary binaries and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04,...

Canonical Snapd Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 21.10 Fedoraproject Fedora 34 Fedoraproject Fedora 35 Debian Debian Linux 10.0 Debian Debian Linux 11.0

7.8

CVSSv3

A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing...

Canonical Snapd Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 21.10 Fedoraproject Fedora 34 Fedoraproject Fedora 35 Debian Debian Linux 10.0 Debian Debian Linux 11.02 Github repositories available

5.9

CVSSv3

It was discovered that snapctl user-open allowed altering the $XDG_DATA_DIRS environment variable when calling the system xdg-open. OpenURL() in usersession/userd/launcher.go would alter $XDG_DATA_DIRS to append a path to a directory controlled by the calling snap. A malicious...

Canonical Ubuntu Linux 16.04 Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 19.10 Canonical Ubuntu Linux 20.04

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