Double-free error in Samba - CVE-2018-16841
Published: November 28, 2018
Vulnerability identifier: #VU16155
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2018-16841
CWE-ID: CWE-415
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Samba
Affected software:
Samba
Samba
Detailed vulnerability description
The vulnerability allows a remote authenticated attacker to cause DoS condition.
The vulnerability exists due to 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 when configured to accept smart-card authentication. A remote attacker can trigger double-free with talloc_free() and directly calls abort() and cause the KDC process to crash.
How to mitigate CVE-2018-16841
The vulnerability has been fixed in the version 4.7.12, 4.8.7, and 4.9.3.