CVE Number = CVE-2018-1140
A vulnerability in the Samba Active Directory domain controller (AD DC) could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on a targeted system.
The vulnerability is due to insufficient validation of user-supplied input parameters to the ldbdatabase layer by the affected software. An attacker could exploit this vulnerability by sending crafted remote procedure call (RPC) requests to a targeted Samba AD DC. A successful exploit could lead to a NULL pointer dereference error and cause the Lightweight Directory Access Protocol (LDAP) server and DNS to crash, resulting in a DoS condition.
Samba.org confirmed the vulnerability and released patches.
To exploit this vulnerability, the attacker must be on the same physical or logical network to send crafted RPC requests to a targeted AD DC, making exploitation more difficult in environments that restrict network access from untrusted sources.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
Samba.org released a security announcement at the following link: CVE-2018-1140
Samba.org released patches at the following link: Samba Security Releases