projectatomic bubblewrap CVE-2020-5291 vulnerability in Projectatomic and Other Products
Published on March 31, 2020

Privilege escalation in setuid mode via user namespaces in Bubblewrap

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Bubblewrap (bwrap) before version 0.4.1, if installed in setuid mode and the kernel supports unprivileged user namespaces, then the `bwrap --userns2` option can be used to make the setuid process keep running as root while being traceable. This can in turn be used to gain root permissions. Note that this only affects the combination of bubblewrap in setuid mode (which is typically used when unprivileged user namespaces are not supported) and the support of unprivileged user namespaces. Known to be affected are: * Debian testing/unstable, if unprivileged user namespaces enabled (not default) * Debian buster-backports, if unprivileged user namespaces enabled (not default) * Arch if using `linux-hardened`, if unprivileged user namespaces enabled (not default) * Centos 7 flatpak COPR, if unprivileged user namespaces enabled (not default) This has been fixed in the 0.4.1 release, and all affected users should update.

NVD

Vulnerability Analysis

CVE-2020-5291 can be exploited with local system access, requires user interaction and a 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 have a high impact on confidentiality and integrity, and no impact on availability.

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

Weakness Type

Incorrect Use of Privileged APIs

The application does not conform to the API requirements for a function call that requires extra privileges. This could allow attackers to gain privileges by causing the function to be called incorrectly.


Products Associated with CVE-2020-5291

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2020-5291 are published in these products:

Projectatomic Bubblewrap
 
Archlinux Arch Linux
 
CentOS
 
Debian Linux
 

Affected Versions

containers bubblewrap Version < 0.4.1 is affected by CVE-2020-5291

Exploit Probability

EPSS
0.19%
Percentile
40.81%

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.