Ubuntu
CVE-2020-11933
MEDIUM
Severity by source
AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
1DescriptionNVD
cloud-init as managed by snapd on Ubuntu Core 16 and Ubuntu Core 18 devices was run without restrictions on every boot, which a physical attacker could exploit by crafting cloud-init user-data/meta-data via external media to perform arbitrary changes on the device to bypass intended security mechanisms such as full disk encryption. This issue did not affect traditional Ubuntu systems. Fixed in snapd version 2.45.2, revision 8539 and core version 2.45.2, revision 9659.
AnalysisAI
cloud-init as managed by snapd on Ubuntu Core 16 and Ubuntu Core 18 devices was run without restrictions on every boot, which a physical attacker could exploit by crafting cloud-init. Rated medium severity (CVSS 6.8), this vulnerability is no authentication required, low attack complexity. No vendor patch available.
Technical ContextAI
This vulnerability is classified under CWE-264. cloud-init as managed by snapd on Ubuntu Core 16 and Ubuntu Core 18 devices was run without restrictions on every boot, which a physical attacker could exploit by crafting cloud-init user-data/meta-data via external media to perform arbitrary changes on the device to bypass intended security mechanisms such as full disk encryption. This issue did not affect traditional Ubuntu systems. Fixed in snapd version 2.45.2, revision 8539 and core version 2.45.2, revision 9659. Affected products include: Canonical Snapd, Canonical Ubuntu Linux. Version information: version 2.45.2.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
Using the TIOCLINUX ioctl request, a malicious snap could inject contents into the input of the controlling terminal whi
Canonical snapd before version 2.37.1 incorrectly performed socket owner validation, allowing an attacker to run arbitra
In snapd versions prior to 2.62, when using AppArmor for enforcement of sandbox permissions, snapd failed to restrict wr
The snapctl component within snapd allows a confined snap to interact with the snapd daemon to take certain privileged a
Race condition in snap-confine's must_mkdir_and_open_with_perms(). Rated high severity (CVSS 7.8). Public exploit code a
snap-confine as included in snapd before 2.39 did not guard against symlink races when performing the chdir() to the cur
snap-confine in snapd before 2.38 incorrectly set the ownership of a snap application to the uid and gid of the first ca
A vulnerability in the seccomp filters of Canonical snapd before version 2.37.4 allows a strict mode snap to insert char
In snapd versions prior to 2.62, snapd failed to properly check the destination of symbolic links when extracting a snap
In snapd versions prior to 2.62, snapd failed to properly check the file type when extracting a snap. Rated medium sever
Same technique Privilege Escalation
View allShare
External POC / Exploit Code
Leaving vuln.today