CVE-2020-5291

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Summary

CVECVE-2020-5291
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-03-31 18:15:00 UTC
Updated2020-04-02 17:33:00 UTC
DescriptionBubblewrap (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.

Risk And Classification

Problem Types: CWE-269

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Archlinux Arch Linux - All All All
Operating System Archlinux Arch Linux - All All All
Operating System Centos Centos 7.0 All All All
Operating System Centos Centos 7.0 All All All
Operating System Debian Debian Linux 10.0 All All All
Operating System Debian Debian Linux 10.0 All All All
Application Projectatomic Bubblewrap All All All All
Application Projectatomic Bubblewrap All All All All

References

ReferenceSourceLinkTags
Privilege escalation in setuid mode via user namespaces · Advisory · containers/bubblewrap · GitHub CONFIRM github.com Mitigation, Third Party Advisory
Merge pull request from GHSA-j2qp-rvxj-43vj · containers/bubblewrap@1f7e2ad · GitHub MISC github.com Patch, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 500076 Alpine Linux Security Update for bubblewrap
  • 503752 Alpine Linux Security Update for bubblewrap
  • 900094 CBL-Mariner Linux Security Update for bubblewrap 0.3.0
  • 903025 Common Base Linux Mariner (CBL-Mariner) Security Update for bubblewrap (2536)
  • 905771 Common Base Linux Mariner (CBL-Mariner) Security Update for bubblewrap (2536-1)
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