Home→Vulnerabilities→CVE-2020-5291
Disclosed

CVE-2020-5291

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.

Share this vulnerability:

Exploitation Probability (EPSS)

Low Priority
0.19%

The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.

0% (Theoretical)100% (Certainty)

7-Day Exploitation Trend

Vulnerability Timeline

2 events
Mar 31, 2020
Vulnerability Disclosed
Published to component-level vulnerability database.
Apr 2, 2020
Last Updated
Record updated with new analysis or tags.

Threat Actor Attribution

PREMIUM INTEL
Associated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes

Remediation & Mitigation

SOLUTION

Official patches and mitigation steps are available for this vulnerability.

# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name

Affected Products

4 Total
projectatomic/bubblewrapAll Versions
debian/debian_linux10.0
archlinux/arch_linux-
centos/centos7.0

References

https://github.com/containers/bubblewrap/commit/1f7e2ad948c051054b683461885a0215f1806240GitHub
PatchThird Party Advisory
https://github.com/containers/bubblewrap/security/advisories/GHSA-j2qp-rvxj-43vjGitHub
MitigationThird Party Advisory

Am I Vulnerable?

Check your domain or package.json for CVE-2020-5291 exposure.

Share This Page

Help others discover this vulnerability information

Vulnerability Details

CVSS Base Score
7.8/ 10
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published Date
Mar 31, 2020
Last Modified
Apr 2, 2020
Need API Access?

Integrate this data into your SOAR platform.

View Plans →
Need Manual Validation?

Automated scanners flag false positives. Get a manual pentest validation for this CVE.