canonical ubuntu-linux CVE-2021-44731 vulnerability in Canonical and Other Products
Published on February 17, 2022

snapd could be made to escalate privileges and run programs as administrator

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A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

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Vulnerability Analysis

CVE-2021-44731 can be exploited with local system access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
LOCAL
Attack Complexity:
HIGH
Privileges Required:
LOW
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is a Race Condition Vulnerability?

The program contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

CVE-2021-44731 has been classified to as a Race Condition vulnerability or weakness.


Products Associated with CVE-2021-44731

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2021-44731 are published in these products:

Canonical Ubuntu Linux
 
Canonical Snapd
 
Fedora Project Fedora
 
Debian Linux
 

Affected Versions

Canonical Ltd. snapd:

Exploit Probability

EPSS
2.30%
Percentile
84.49%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.