CVE-2018-16841
Description
Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2018-16841
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2018-16841.html
Vendor advisory: arch — https://security.archlinux.org/ASA-201811-22
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 4.9.3-1 | |
| sles | affected | | |
| debian | bookworm | fixed | 2:4.9.2+dfsg-2 |
| debian | bullseye | fixed | 2:4.9.2+dfsg-2 |
| debian | forky | fixed | 2:4.9.2+dfsg-2 |
| debian | sid | fixed | 2:4.9.2+dfsg-2 |
| debian | trixie | fixed | 2:4.9.2+dfsg-2 |
References
Verify integrity in audit chain (admin only). AS-IS.