The remote Redhat Enterprise Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2013:1806 advisory.

    Samba is an open-source implementation of the Server Message Block (SMB) or     Common Internet File System (CIFS) protocol, which allows PC-compatible     machines to share files, printers, and other information.

    A heap-based buffer overflow flaw was found in the DCE-RPC client code in     Samba. A specially crafted DCE-RPC packet could cause various Samba     programs to crash or, possibly, execute arbitrary code when parsed.
    A malicious or compromised Active Directory Domain Controller could use     this flaw to compromise the winbindd daemon running with root privileges.
    (CVE-2013-4408)

    A flaw was found in the way Samba performed ACL checks on alternate file     and directory data streams. An attacker able to access a CIFS share with     alternate stream support enabled could access alternate data streams     regardless of the underlying file or directory ACL permissions.
    (CVE-2013-4475)

    Red Hat would like to thank the Samba project for reporting CVE-2013-4408.
    Upstream acknowledges Stefan Metzmacher and Michael Adam of SerNet as the     original reporters of this issue.

    All users of Samba are advised to upgrade to these updated packages, which     contain backported patches to correct these issues. After installing this     update, the smb service will be restarted automatically.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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RHEL 5 / 6 : samba and samba3x (RHSA-2013:1806)

critical Nessus Plugin ID 71293

Version 1.30