Winsock RSHD/NT daemon standard connection error data denial of service

winsock-rshdnt-error-dos (7694) The risk level is classified as MediumMedium Risk

Description:

Winsock RSHD/NT is vulnerable to a denial of service attack. If a remote attacker establishes a connection to the daemon using an rsh command, but specifies an invalid port number to send error data, Winsock RSHD/NT would then attempt to connect to the invalid port followed by connection attempts to all ports below 1025, which would result in 100% CPU usage.


Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of RSHD/NT (2.21.03 or later), available from the Denicomp systems Web site. See References.

References:

Platforms Affected:

  • Denicomp Winsock RSHD/NT 2.20
  • Denicomp Winsock RSHD/NT 2.21

Reported:

Dec 08, 2001

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