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CVE-2021-3155

snapd created ~/snap with too-wide permissions

MEDIUM
5.5
CVSS Score
Published: February 17, 2022 at 10:15 PM UTC
Updated: June 17, 2026 at 04:04 AM UTC
2 products affected across 2 vendorsUbuntu LinuxSnapd

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.3%

Description

snapd 2.54.2 and earlier created ~/snap directories in user home directories without specifying owner-only permissions. This could allow a local attacker to read information that should have been private. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ubuntu Linux· Canonicalrubygems
95%
18.0420.0421.10
Snapd· Snapcraft
95%
v ≤ 2.54.2v < 2.54.3
Affected range stops below 2.54.3, so it looks safe — our inference, not a vendor statement

References (3)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/snapcore/snapd/commit/6bcaeeccd16ed8298a301dd92f6907f88c24cc85
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/snapcore/snapd/commit/7d2a966620002149891446a53cf114804808dcca
x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://ubuntu.com/security/notices/USN-5292-1

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-276

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