The Go SSH library (x/crypto/ssh) by default does not verify host keys, facilitating man-in-the-middle attacks. Default behavior changed in commit e4e2799 to require explicitly registering a hostkey verification mechanism.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2017-3204 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 | 4.8 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | Low |
| Availability Impact | None |
| Platform | Package | State |
|---|---|---|
| Red Hat Software Collections for Red Hat Enterprise Linux | rh-mongodb32-golang-googlecode-go-crypto | Not affected |
| Red Hat OpenShift Enterprise 3 | atomic-openshift | Will not fix |
| Red Hat Enterprise Linux 7 | gomtree | Not affected |
| Red Hat Enterprise Linux 7 | kubernetes | Will not fix |
Vulmon