CVE-2016-2123

Name of the Vulnerable Software and Affected Versions Samba versions 4.0.0 through 4.5.2

Description A flaw in the Samba routine ndr pull dnsp name contains an integer wrap problem, leading to an attacker-controlled memory overwrite. This routine parses data from the Samba Active Directory ldb database. Any user who can write to the dnsRecord attribute over LDAP can trigger this memory corruption. By default, all authenticated LDAP users can write to the dnsRecord attribute on new DNS objects, making this a remote privilege escalation issue.

Recommendations For Samba versions 4.0.0 through 4.5.2, consider restricting access to the dnsRecord attribute over LDAP to prevent exploitation until a patch is available. As a temporary workaround, limit the privileges of authenticated LDAP users to minimize the risk of remote privilege escalation.