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764d8cef56
rev 1.66. This fix contains both belt and suspenders. Belt: ignore packets where src == dst and srcport == dstport in TCPS_LISTEN. These packets can only legitimately occur when connecting a socket to itself, which doesn't go through TCPS_LISTEN (it goes CLOSED->SYN_SENT->SYN_RCVD-> ESTABLISHED). This prevents the "standard" "land" attack, although doesn't prevent the multi-homed variation. Suspenders: send a RST in response to a SYN/ACK in SYN_RECEIVED state. The only packets we should get in SYN_RECEIVED are 1. A retransmitted SYN, or 2. An ack of our SYN/ACK. The "land" attack depends on us accepting our own SYN/ACK as an ACK; in SYN_RECEIVED state; this should prevent all "land" attacks. We also move up the sequence number check for the ACK in SYN_RECEIVED. This neither helps nor hurts with respect to the "land" attack, but puts more of the validation checking in one spot. PR: kern/5103 |
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| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| kerberosIV | ||
| lib | ||
| libexec | ||
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| release | ||
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| Makefile.alpha | ||
| README | ||
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