Winsock RSHD/NT daemon standard connection error data denial of service
| winsock-rshdnt-error-dos (7694) |  Low 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.
Platforms Affected:
- Denicomp, Winsock RSHD/NT 2.20
- Denicomp, Winsock RSHD/NT 2.21
Remedy:
Upgrade to the latest version of RSHD/NT (2.21.03 or later), available from the Denicomp systems Web site. See References.
Consequences:
Denial of Service
References:
- BugTraq Mailing List, Sat Dec 08 2001 - 08:24:48 CST, Winsock RSHD/NT 2.20.00 CPU overusage when invalid data is send at http://archives.neohapsis.com/archives/bugtraq/2001-12/0089.html.
- BugTraq Mailing List, Thu Dec 13 2001 - 07:46:34 CST, WRSHDNT 2.21.00 CPU overusage at http://archives.neohapsis.com/archives/bugtraq/2001-12/0136.html.
- Denicomp Systems Web site, Winsock RSHD/NT at http://www.denicomp.com/rshdnt.htm.
- Denicomp Systems Web site, Products at http://www.denicomp.com/products.htm.
- BID-3659: Denicomp Winsock RSHD/NT Standard Error Denial of Service Vulnerability
- CVE-2001-1184: wrshdsp.exe in Denicomp Winsock RSHD/NT 2.21.00 and earlier allows remote attackers to cause a denial of service (CPU consumption) via (1) in 2.20.00 and earlier, an invalid port number such as a negative number, which causes a connection attempt to that port and all ports below 1024, and (2) in 2.21.00, a port number of 1024.
Reported:
Dec 08, 2001
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