CVE-2019-15793: Mishandling of file-system uid/gid with namespaces in shiftfs
First published: Tue Nov 12 2019(Updated: )
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.
Credit: security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | =5.0 | |
| Linux Kernel | =5.3 | |
| Ubuntu Linux | =18.04 | |
| Ubuntu Linux | =19.04 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.13-1 | |
| Ubuntu | =18.04 | |
| Ubuntu | =19.04 |
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Reference Links
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=3644b9d5688da86f18e017c9c580b75cf52927bb
- https://usn.ubuntu.com/usn/usn-4183-1
- https://usn.ubuntu.com/usn/usn-4184-1
- https://launchpad.net/bugs/cve/CVE-2019-15793
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1850867
- https://security-tracker.debian.org/tracker/CVE-2019-15793
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15793
- https://nvd.nist.gov/vuln/detail/CVE-2019-15793
- https://ubuntu.com/security/CVE-2019-15793
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2019-15793.
What is the affected software for this vulnerability?
The affected software for this vulnerability includes the Ubuntu 5.0 and 5.3 kernel series.
What is the severity of CVE-2019-15793?
The severity of CVE-2019-15793 is not specified.
How can I fix CVE-2019-15793?
To fix CVE-2019-15793, it is recommended to update to the latest version of the Ubuntu kernel series affected by this vulnerability.
Where can I find more information about CVE-2019-15793?
You can find more information about CVE-2019-15793 in the references provided: [reference](https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=3644b9d5688da86f18e017c9c580b75cf52927bb) [reference](https://usn.ubuntu.com/usn/usn-4183-1) [reference](https://usn.ubuntu.com/usn/usn-4184-1)
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