Information disclosure in Linux Kernel
CVE-2019-15793
In 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.
EPSS: 0.007 (48.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
Affected products
- Linux Linux_kernel — versions 5.0, 5.3
- Canonical Ubuntu_linux — versions 18.04, 19.04
- Ubuntu Shiftfs In The Linux Kernel — versions 5.3.0-11.12, 5.0 kernel
Weakness classification (CWE)
References
- security@ubuntu.com (Third Party Advisory, x_refsource_MISC)
- security@ubuntu.com (Third Party Advisory, x_refsource_MISC)
- security@ubuntu.com (Patch, Mailing List, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2019-15793?
- CVE-2019-15793 is a medium-severity vulnerability in Linux Kernel, classified under Insertion of Sensitive Information into Externally-Accessible File or Directory. CVSS score: 6.5/10. Published 2020-04-24.
- How severe is CVE-2019-15793?
- Medium severity. CVSS v3 base score is 6.5 out of 10.