Home/CVE/Bubblewrap (bwrap) before version 0.4.1, if installed in setuid mode and the kernel supports unprivileged user namespace
CVE

CVE-2020-5291

Bubblewrap (bwrap) before version 0.4.1, if installed in setuid mode and the kernel supports unprivileged user namespace

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.

HIGH · CVSS 7.2 EPSS 0.00177
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-269Improper Privilege Management
CWE-648Incorrect Use of Privileged APIs
▤

Affected Products & Versions

4
projectatomic bubblewrap< 0.4.1
debian linuxall versions
archlinux arch linuxall versions
centosall versions
▣

Scoring & Timeline

7.2
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD31 Mar 2020 · 06:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
⚑

Vendor Advisories

2
suse-csafopenSUSE-SU-2024:10663-1
msrcCVE-2020-5291
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/containers/bubblewrap/commit/1f7e2ad948c051054b683461885a0215f1806240PatchThird Party Advisory
https://github.com/containers/bubblewrap/security/advisories/GHSA-j2qp-rvxj-43vjMitigationThird Party Advisory
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