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CVE-2020-11934

Sandbox escape vulnerability via snapctl user-open (xdg-open)

Published: Jul 29, 2020Updated: Nov 21, 2024 Sources: CVE List NVDCWE-668
5.9MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 71.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:RS:CC:NI:HA:N
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-668

Affected Products

Canonical
commercial·GBaka canonical ltd.
ubuntu linuxOn-premOS
Operating Systems / linux-distro
snapdOn-prem
Operating Systems / linux-distro

Exploitability

Official Patch Available
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References

https://launchpad.net/bugs/1880085
launchpad.net
https://ubuntu.com/USN-4424-1
ubuntu.com

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