Samba could allow a remote authenticated attacker to obtain sensitive information. By querying a symlink inside the exported share using SMB1 with unix extensions turned on, an attacker could exploit this vulnerability to discover if a named or directory exists on the filesystem outside of the exported share.
Samba could allow a remote authenticated attacker to bypass security restrictions, caused by a flaw in the validation process of adding service principals names (SPNs) to an account. By sending a specially-crafted request, an attacker could exploit this vulnerability to impersonate arbitrary services or cause a denial of service condition on the system.
Upgrade to the latest version of Samba, available from the Samba Web site.