A command injection flaw was found in the way util-linux implements umount autocompletion in Bash. An attacker with the ability to mount a filesystem with custom mount points may execute arbitrary commands on behalf of the user who triggers the umount autocompletion.
Find out more about CVE-2018-7738 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue did not affect the versions of util-linux as shipped with Red Hat Enterprise Linux 5, 6 and 7 as they did not include support for umount autocompletion.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 6.7 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H |
| Attack Vector | Local |
| Attack Complexity | High |
| Privileges Required | Low |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity Impact | High |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | util-linux | Not affected |
| Red Hat Enterprise Linux 6 | util-linux-ng | Not affected |
| Red Hat Enterprise Linux 5 | util-linux | Not affected |
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