snapd snapctl launcher.go OpenURL $XDG_DATA_DIRS privileges management

Summaryinfo

A vulnerability, which was classified as critical, was found in snapd. The affected element is the function OpenURL of the file usersession/userd/launcher.go of the component snapctl. Executing a manipulation of the argument $XDG_DATA_DIRS as part of Environment Variable can lead to privileges management. The identification of this vulnerability is CVE-2020-11934. The attack can only be executed locally. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in snapd. It has been declared as critical. This vulnerability affects the function OpenURL of the file usersession/userd/launcher.go of the component snapctl. The manipulation of the argument $XDG_DATA_DIRS as part of a Environment Variable leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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 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.

The weakness was shared 07/29/2020 (Website). The advisory is available at launchpad.net. This vulnerability was named CVE-2020-11934 since 04/20/2020. Local access is required to approach this attack. A single authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 2.45.1ubuntu0.2, 2.45.1+18.04.2 or 2.45.1+20.04.2 eliminates this vulnerability.

The entry VDB-159153 is related to this item. If you want to get best quality of vulnerability data, you may have to visit VulDB.

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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