Winsock RSHD/NT daemon standard connection error data denial of service
| winsock-rshdnt-error-dos (7694) |  Medium 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:
- BugTraq Mailing List, Sat Dec 08 2001 - 08:24:48 CST: Winsock RSHD/NT 2.20.00 CPU overusage when invalid data is send.
- BugTraq Mailing List, Thu Dec 13 2001 - 07:46:34 CST: WRSHDNT 2.21.00 CPU overusage.
- Denicomp Systems Web site: Winsock RSHD/NT.
- Denicomp Systems Web site: Products.
- 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.
- OSVDB ID: 14179: Denicomp Winsock RSHD/NT wrshdsp.exe Malformed Port Number DoS
Platforms Affected:
- Denicomp Winsock RSHD/NT 2.20
- Denicomp Winsock RSHD/NT 2.21
Reported:
Dec 08, 2001
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