CVE-2020-11934 — MEDIUM (5.9)

Vulnerability Description

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.

CVSS Score

5.9

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

NONE

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Canonical	Ubuntu Linux	16.04

Related Weaknesses (CWE)

CWE-668

References

https://launchpad.net/bugs/1880085Third Party Advisory
https://ubuntu.com/USN-4424-1Vendor Advisory
https://launchpad.net/bugs/1880085Third Party Advisory
https://ubuntu.com/USN-4424-1Vendor Advisory

FAQ

What is CVE-2020-11934?

CVE-2020-11934 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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_DIR...

How severe is CVE-2020-11934?

CVE-2020-11934 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2020-11934?

Check the references section above for vendor advisories and patch information. Affected products include: Canonical Ubuntu Linux.