BSD systems ARP request denial of service
| bsd-arp-request-dos (5340) |  Medium Risk |
Description:
OpenBSD is vulnerable to a denial of service attack. By sending a large number of spoofed packets to a OpenBSD is vulnerable to a denial of service attack. By sending a large number of spoofed packets to a inside the network, a remote attacker can cause the system to send out a large number of ARP requests. If a system generates a large number of pending ARP requests without receiving replies, it causes the kernel to panic, and the message "out of kmem_map" appears. The system must be restarted to regain normal functionality.
Platforms Affected:
- OpenBSD, OpenBSD 2.0
- OpenBSD, OpenBSD 2.1
- OpenBSD, OpenBSD 2.2
- OpenBSD, OpenBSD 2.3
- OpenBSD, OpenBSD 2.4
- OpenBSD, OpenBSD 2.5
- OpenBSD, OpenBSD 2.6
Remedy:
Upgrade to the latest version of OpenBSD (2.8 or later), available from the OpenBSD Web site. See References.
Consequences:
Denial of Service
References:
- BugTraq Mailing List, Thu Oct 05 2000 - 13:40:16 CDT, obsd_fun.c at http://archives.neohapsis.com/archives/bugtraq/2000-10/0078.html.
- OpenBSD Web site, OpenBSD at http://www.openbsd.org/.
- BID-1759: OpenBSD Pending ARP Request Remote DoS Vulnerability
- CVE-2000-0914: OpenBSD 2.6 and earlier allows remote attackers to cause a denial of service by flooding the server with ARP requests.
- OSVDB ID: 1592: OpenBSD Pending ARP Request Remote DoS
Reported:
Oct 05, 2000
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