GnuPG 2.2.4 and 2.2.5 does not enforce a configuration in which key certification requires an offline master Certify key, which results in apparently valid certifications that occurred only with access to a signing subkey.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-9234 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 | 2.2 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N |
| Attack Vector | Local |
| Attack Complexity | High |
| Privileges Required | Low |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | Low |
| Availability Impact | None |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | gnupg2 | Affected |
| Red Hat Enterprise Linux 6 | gnupg2 | Affected |
| Red Hat Enterprise Linux 5 | gnupg | Will not fix |
| Red Hat Enterprise Linux 5 | gnupg2 | Will not fix |
Vulmon