CVE Tools
Sign in

CVE-2020-5291

Privilege escalation in setuid mode via user namespaces in Bubblewrap

Published: Mar 31, 2020Updated: Nov 21, 2024 Sources: CVE List NVD BDUCWE-648
NVD MITRE
7.2CVSSHIGH
EPSS Score
0.9%
Top 44.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:LAC:HPR:LUI:RS:CC:HI:HA:N
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-648CWE-269

Affected Products

bubblewrapcontainers
Mixed
Cloud & SaaS
bubblewrapprojectatomic
Mixed
DevTools & CI / artifact-registry
debian linuxdebian
On-premOS
Operating Systems / linux-distro
arch linuxarchlinux
On-prem
Operating Systems / linux-distro
centoscentos
On-prem
Operating Systems / linux-distro
containersoss-projectCloud & SaaSaka aardvark-dns, bubblewrap, crun
projectatomicoss-projectDevTools & CIaka projectatomic
debianoss-projectGBOperating Systemsaka debian gnu/linux
archlinuxoss-projectOperating Systemsaka arch linux
centososs-projectOperating Systemsaka centos linux, stream
and 4 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://github.com/containers/bubblewrap/security/advisories/GHSA-j2qp-rvxj-43vj
github.com
https://github.com/containers/bubblewrap/commit/1f7e2ad948c051054b683461885a0215f1806240
github.com
https://nvd.nist.gov/vuln/detail/CVE-2020-5291
nvd.nist.gov
and 4 more references View all →

Timeline

Published
Mar 31, 2020
Last Updated
Nov 21, 2024

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2020-5291 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows