Vulnerability Details : 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.
Products affected by CVE-2019-15793
- cpe:2.3:o:linux:linux_kernel:5.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.3:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-15793
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-15793
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.6
|
MEDIUM | AV:L/AC:L/Au:N/C:P/I:P/A:P |
3.9
|
6.4
|
NIST | |
|
8.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
2.0
|
6.0
|
NIST | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
2.0
|
4.0
|
Canonical Ltd. |
CWE ids for CVE-2019-15793
-
During installation, installed file permissions are set to allow anyone to modify those files.Assigned by: nvd@nist.gov (Primary)
-
The product places sensitive information into files or directories that are accessible to actors who are allowed to have access to the files, but not to the sensitive information.Assigned by: security@ubuntu.com (Secondary)
References for CVE-2019-15793
-
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=3644b9d5688da86f18e017c9c580b75cf52927bb
~ubuntu-kernel/ubuntu/+source/linux/+git/eoan - [no description]Mailing List;Patch;Third Party Advisory
-
https://usn.ubuntu.com/usn/usn-4183-1
USN-4183-1: Linux kernel vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://usn.ubuntu.com/usn/usn-4184-1
USN-4184-1: Linux kernel vulnerabilities | Ubuntu security noticesThird Party Advisory
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