Title: MacOS 9 Open Transport ICMP Vulnerability
Severity: MODERATE
Description:
The implementation of Open Transport in MacOS 9 includes a weakness that could allow an attacker to use the Mac as a traffic amplifier in a DoS attack against another computer.
A specially-crafted 29-byte UDP packet can be sent to a machine running MacOS 9. The Mac will then respond with a 1500 byte ICMP packet. If the first UDP packet is sent with a spoofed IP address of a third machine, and these spoofed triggger packets are sent to several MacOS 9 machines,, it will create an effective DoS of the third machine due to bandwidth starvation.
Affected Products:
- Apple Mac OS 9 9.0.0
References:
- John A. Copeland: The "Mac DoS Attack," a Scheme for Blocking Internet Connections
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