GLSA-200908-02 : BIND: Denial of Service
Medium Nessus Plugin ID 40463
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-200908-02 (BIND: Denial of Service)
Matthias Urlichs reported that the dns_db_findrdataset() function fails when the prerequisite section of the dynamic update message contains a record of type 'ANY' and where at least one RRset for this FQDN exists on the server.
A remote unauthenticated attacker could send a specially crafted dynamic update message to the BIND daemon (named), leading to a Denial of Service (daemon crash). This vulnerability affects all primary (master) servers -- it is not limited to those that are configured to allow dynamic updates.
Configure a firewall that performs Deep Packet Inspection to prevent nsupdate messages from reaching named. Alternatively, expose only secondary (slave) servers to untrusted networks.
SolutionAll BIND users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=net-dns/bind-9.4.3_p3'