GEN:SID | 1:1264 |
Message | RPC portmap bootparam request TCP |
Summary | This event is generated when an attempt is made through a portmap GETPORT request to discover the port where the Remote Procedure Call (RPC) bootparam is listening.
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Impact | Information disclosure. This request is used to discover which port bootparam is using. Attackers can also learn what versions of the bootparam protocol are accepted by bootparam.
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Detailed Information | The portmapper service registers all RPC services on UNIX hosts. It can be queried to determine the port where RPC services such as bootparam run. The bootparam RPC service is used by some diskless workstations to discover information from a server required to boot. The client will issue a bootparam whoami request to the server. The server response will include the Network Information Systems (NIS) domain name. An attacker can send a bootparam request if no authentication is used. The domain name provides valuable information that can be used to break into an NIS environment.
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Affected Systems | Any host running bootparam with no authentication.
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Attack Scenarios | An attacker can query the portmapper to discover the port where bootparam runs. This may be a precursor to accessing bootparam.
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Ease of Attack | Simple.
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Corrective Action | Limit remote access to RPC services.
Filter RPC ports at the firewall to ensure access is denied to RPC-enabled machines.
Disable unneeded RPC services.
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Additional References | CVE http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-1999-0647
Arachnids http://www.whitehats.com/info/IDS16
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Rule References | arachnids: 16
cve: 1999-0647
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