It was discovered that snapctl user-open allowed altering the $XDGDATADIRS environment variable when calling the system xdg-open. OpenURL() in usersession/userd/launcher.go would alter $XDGDATADIRS to append a path to a directory controlled by the calling snap. A malicious snap could exploit this to bypass intended access restrictions to control how the host system xdg-open script opens the URL and, for example, execute a script shipped with the snap without confinement. This issue did not affect Ubuntu Core systems. Fixed in snapd versions 2.45.1ubuntu0.2, 2.45.1+18.04.2 and 2.45.1+20.04.2.
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "2.45.1ubuntu0.2", "binary_name": "golang-github-snapcore-snapd-dev" }, { "binary_version": "2.45.1ubuntu0.2", "binary_name": "golang-github-ubuntu-core-snappy-dev" }, { "binary_version": "2.45.1ubuntu0.2", "binary_name": "snap-confine" }, { "binary_version": "2.45.1ubuntu0.2", "binary_name": "snapd" }, { "binary_version": "2.45.1ubuntu0.2", "binary_name": "snapd-dbgsym" }, { "binary_version": "2.45.1ubuntu0.2", "binary_name": "snapd-xdg-open" }, { "binary_version": "2.45.1ubuntu0.2", "binary_name": "ubuntu-core-launcher" }, { "binary_version": "2.45.1ubuntu0.2", "binary_name": "ubuntu-core-snapd-units" }, { "binary_version": "2.45.1ubuntu0.2", "binary_name": "ubuntu-snappy" }, { "binary_version": "2.45.1ubuntu0.2", "binary_name": "ubuntu-snappy-cli" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "2.45.1+18.04.2", "binary_name": "golang-github-snapcore-snapd-dev" }, { "binary_version": "2.45.1+18.04.2", "binary_name": "golang-github-ubuntu-core-snappy-dev" }, { "binary_version": "2.45.1+18.04.2", "binary_name": "snap-confine" }, { "binary_version": "2.45.1+18.04.2", "binary_name": "snapd" }, { "binary_version": "2.45.1+18.04.2", "binary_name": "snapd-dbgsym" }, { "binary_version": "2.45.1+18.04.2", "binary_name": "snapd-xdg-open" }, { "binary_version": "2.45.1+18.04.2", "binary_name": "ubuntu-core-launcher" }, { "binary_version": "2.45.1+18.04.2", "binary_name": "ubuntu-core-snapd-units" }, { "binary_version": "2.45.1+18.04.2", "binary_name": "ubuntu-snappy" }, { "binary_version": "2.45.1+18.04.2", "binary_name": "ubuntu-snappy-cli" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "2.45.1+20.04.2", "binary_name": "golang-github-snapcore-snapd-dev" }, { "binary_version": "2.45.1+20.04.2", "binary_name": "golang-github-ubuntu-core-snappy-dev" }, { "binary_version": "2.45.1+20.04.2", "binary_name": "snap-confine" }, { "binary_version": "2.45.1+20.04.2", "binary_name": "snapd" }, { "binary_version": "2.45.1+20.04.2", "binary_name": "snapd-dbgsym" }, { "binary_version": "2.45.1+20.04.2", "binary_name": "snapd-xdg-open" }, { "binary_version": "2.45.1+20.04.2", "binary_name": "ubuntu-core-launcher" }, { "binary_version": "2.45.1+20.04.2", "binary_name": "ubuntu-core-snapd-units" }, { "binary_version": "2.45.1+20.04.2", "binary_name": "ubuntu-snappy" }, { "binary_version": "2.45.1+20.04.2", "binary_name": "ubuntu-snappy-cli" } ] }