CVE-2019-15793

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Summary

CVECVE-2019-15793
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-04-24 00:15:00 UTC
Updated2020-05-01 14:48:00 UTC
DescriptionIn shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, several locations which shift ids translate user/group ids before performing operations in the lower filesystem were translating them into init_user_ns, whereas they should have been translated into the s_user_ns for the lower filesystem. This resulted in using ids other than the intended ones in the lower fs, which likely did not map into the shifts s_user_ns. A local attacker could use this to possibly bypass discretionary access control permissions.

Risk And Classification

Problem Types: CWE-276

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Canonical Ubuntu Linux 18.04 All All All
Operating System Canonical Ubuntu Linux 19.04 All All All
Operating System Canonical Ubuntu Linux 18.04 All All All
Operating System Canonical Ubuntu Linux 19.04 All All All
Operating System Linux Linux Kernel 5.0 All All All
Operating System Linux Linux Kernel 5.3 All All All
Operating System Linux Linux Kernel 5.0 All All All
Operating System Linux Linux Kernel 5.3 All All All

References

ReferenceSourceLinkTags
USN-4184-1: Linux kernel vulnerabilities | Ubuntu security notices MISC usn.ubuntu.com Third Party Advisory
USN-4183-1: Linux kernel vulnerabilities | Ubuntu security notices MISC usn.ubuntu.com Third Party Advisory
~ubuntu-kernel/ubuntu/+source/linux/+git/eoan - [no description] MISC git.launchpad.net Mailing List, Patch, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

LEGACY: Jann Horn of Google Project Zero

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