Release Date: | 2018-07-06 |
The inode_init_owner function in fs/inode.c in the Linux kernel through 4.17.4 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID.
See more information about CVE-2018-13405 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
Base Score: | 7.8 | Base Metrics: | AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Access Vector: | Local network | Attack Complexity: | Low |
Privileges Required: | Low | User Interaction: | None |
Scope: | Unchanged | Confidentiality Impact: | High |
Integrity Impact: | High | Availability Impact: | High |
Platform | Errata | Release Date |
Oracle Linux version 6 (dtrace-modules-3.8.13-118.24.1.el6uek) | ELSA-2018-4211 | 2018-09-10 |
Oracle Linux version 6 (kernel) | ELSA-2019-0717 | 2019-04-11 |
Oracle Linux version 6 (kernel-uek) | ELSA-2018-4211 | 2018-09-10 |
Oracle Linux version 7 (dtrace-modules-3.8.13-118.24.1.el7uek) | ELSA-2018-4211 | 2018-09-10 |
Oracle Linux version 7 (kernel) | ELSA-2018-3083 | 2018-11-05 |
Oracle Linux version 7 (kernel-uek) | ELSA-2018-4211 | 2018-09-10 |
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