Vulnerability Details : CVE-2020-11934
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.
Products affected by CVE-2020-11934
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-11934
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 10 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-11934
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
1.9
|
LOW | AV:L/AC:M/Au:N/C:N/I:P/A:N |
3.4
|
2.9
|
NIST | |
5.9
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N |
1.5
|
4.0
|
NIST | |
5.9
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N |
1.5
|
4.0
|
Canonical Ltd. |
CWE ids for CVE-2020-11934
-
The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-11934
-
https://ubuntu.com/USN-4424-1
USN-4424-1: snapd vulnerabilities | Ubuntu security notices | UbuntuVendor Advisory
-
https://launchpad.net/bugs/1880085
Bug #1880085 “snap userd's OpenURL method allows sandox escape” : Bugs : snapdThird Party Advisory
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