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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (50.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- 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
- usn.ubuntu.com/usn/usn-4183-1 (Third Party Advisory)
- usn.ubuntu.com/usn/usn-4184-1 (Third Party Advisory)
- git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/ (Patch, Mailing List, Third Party Advisory)
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.