canonical ubuntu linux 20.04 vulnerabilities and exploits

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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

4.7

CVSSv3

An Ubuntu-specific patch in PulseAudio created a race condition where the snap policy module would fail to identify a client connection from a snap as coming from a snap if SCM_CREDENTIALS were missing, allowing the snap to connect to PulseAudio without proper confinement. This...

Canonical Ubuntu Linux 16.04 Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 20.10

7.8

CVSSv3

Ubuntu-specific modifications to accountsservice (in patch file debian/patches/0010-set-language.patch) caused the fallback_locale variable, pointing to static storage, to be freed, in the user_change_language_authorized_cb function. This is reachable via the SetLanguage dbus...

Canonical Accountsservice Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 21.04 Canonical Ubuntu Linux 21.101 Article 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

5.5

CVSSv3

Aptdaemon performed policykit checks after interacting with potentially untrusted files with elevated privileges. This affected versions prior to 1.1.1+bzr982-0ubuntu34.1, 1.1.1+bzr982-0ubuntu32.3, 1.1.1+bzr982-0ubuntu19.5, 1.1.1+bzr982-0ubuntu14.5....

Canonical Ubuntu Linux 16.04 Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 20.10

5.5

CVSSv3

It was discovered that read_file() in apport/hookutils.py would follow symbolic links or open FIFOs. When this function is used by the openjdk-14 package apport hooks, it could expose private data to other local users....

Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 20.10 Canonical Ubuntu Linux 21.04 Canonical Ubuntu Linux 21.10

5.5

CVSSv3

It was discovered that read_file() in apport/hookutils.py would follow symbolic links or open FIFOs. When this function is used by the openjdk-15 package apport hooks, it could expose private data to other local users....

Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 20.10 Canonical Ubuntu Linux 21.04 Canonical Ubuntu Linux 21.10

8.8

CVSSv3

The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc/<PID>/mem. This could be used to create a heap overflow leading to arbitrary code...

Linux Linux Kernel Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 20.10 Canonical Ubuntu Linux 21.04

3.8

CVSSv3

The aptdaemon DBus interface disclosed file existence disclosure by setting Terminal/DebconfSocket properties, aka GHSL-2020-192 and GHSL-2020-196. This affected versions prior to 1.1.1+bzr982-0ubuntu34.1, 1.1.1+bzr982-0ubuntu32.3, 1.1.1+bzr982-0ubuntu19.5,...

Canonical Ubuntu Linux 16.04 Canonical Ubuntu Linux 18.04 Canonical Ubuntu Linux 20.04 Canonical Ubuntu Linux 20.10

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

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