A command injection was discovered in mgetty in the faxrunq script used to send queued faxes. The shell script faxrunq does not properly escape the arguments passed to faxsend before evaluating the command allowing a user, who has permissions to queue faxes in the system, to execute arbitrary command with elevated privileges.
Find out more about CVE-2018-16741 from the MITRE CVE dictionary dictionary and NIST NVD.
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:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | High |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity Impact | High |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | mgetty | Affected |
| Red Hat Enterprise Linux 6 | mgetty | Will not fix |
| Red Hat Enterprise Linux 5 | mgetty | Will not fix |
Allow only trusted users to run the faxq-helper binary, by correctly setting the /etc/mgetty+sendfax/fax.allow configuration file.
Vulmon