Title: BSD TCP/IP Broadcast Connection Check Vulnerability
Severity: MODERATE
Description:
An error has been reported in the TCP/IP implementation of multiple BSD derived operating systems, including FreeBSD, NetBSD and possibly OpenBSD. Versions of SGI IRIX are also affected.
RFC 1122 specifies that a TCP implementation must silently discard an incoming SYN segment addressed to a multicast or broadcast address. The vulnerable BSD implementation will drop a packet based on the link layer address. However, it does not properly check the destination IP address for this condition.
As a result, a carefully constructed packet may bypass this restriction. Under some circumstances, an attacker may be able to use this implementation flaw to bypass access control rules. If a firewall assumes that it is not possible to initiate a TCP/IP connection to a broadcast address, traffic may not be adequately filtered.
Affected Products:
- Apple Mac OS X 10.0.0
- Apple Mac OS X 10.1.0
- Apple Mac OS X 10.1.1
- Apple Mac OS X 10.1.2
- Apple Mac OS X 10.1.3
- FreeBSD FreeBSD 2.0.0
- FreeBSD FreeBSD 2.0.5
- FreeBSD FreeBSD 2.1.0
- FreeBSD FreeBSD 2.1.5
- FreeBSD FreeBSD 2.1.6
- FreeBSD FreeBSD 2.1.6 .1
- FreeBSD FreeBSD 2.1.7 .1
- FreeBSD FreeBSD 2.2.0
- FreeBSD FreeBSD 2.2.2
- FreeBSD FreeBSD 2.2.3
- FreeBSD FreeBSD 2.2.4
- FreeBSD FreeBSD 2.2.5
- FreeBSD FreeBSD 2.2.6
- FreeBSD FreeBSD 2.2.8
- FreeBSD FreeBSD 3.0.0
- FreeBSD FreeBSD 3.1.0
- FreeBSD FreeBSD 3.2.0
- FreeBSD FreeBSD 3.3.0
- FreeBSD FreeBSD 3.4.0
- FreeBSD FreeBSD 3.5.0
- FreeBSD FreeBSD 3.5.1
- FreeBSD FreeBSD 4.0.0
- FreeBSD FreeBSD 4.1.0
- FreeBSD FreeBSD 4.1.1
- FreeBSD FreeBSD 4.2.0
- FreeBSD FreeBSD 4.3.0
- FreeBSD FreeBSD 4.4.0
- FreeBSD FreeBSD 4.5.0
- NetBSD NetBSD 1.0.0
- NetBSD NetBSD 1.1.0
- NetBSD NetBSD 1.2.0
- NetBSD NetBSD 1.2.1
- NetBSD NetBSD 1.3.0
- NetBSD NetBSD 1.3.1
- NetBSD NetBSD 1.3.2
- NetBSD NetBSD 1.3.3
- NetBSD NetBSD 1.4.0
- NetBSD NetBSD 1.4.1
- NetBSD NetBSD 1.4.1 Alpha
- NetBSD NetBSD 1.4.1 SPARC
- NetBSD NetBSD 1.4.1 arm32
- NetBSD NetBSD 1.4.1 sh3
- NetBSD NetBSD 1.4.1 x86
- NetBSD NetBSD 1.4.2
- NetBSD NetBSD 1.4.2 Alpha
- NetBSD NetBSD 1.4.2 SPARC
- NetBSD NetBSD 1.4.2 arm32
- NetBSD NetBSD 1.4.2 x86
- NetBSD NetBSD 1.4.3
- NetBSD NetBSD 1.5.0
- NetBSD NetBSD 1.5.0 sh3
- NetBSD NetBSD 1.5.0 x86
- NetBSD NetBSD 1.5.1
- NetBSD NetBSD 1.5.2
- OpenBSD OpenBSD 2.0.0
- OpenBSD OpenBSD 2.1.0
- OpenBSD OpenBSD 2.2.0
- OpenBSD OpenBSD 2.3.0
- OpenBSD OpenBSD 2.4.0
- OpenBSD OpenBSD 2.5.0
- OpenBSD OpenBSD 2.6.0
- OpenBSD OpenBSD 2.7.0
- OpenBSD OpenBSD 2.8.0
- OpenBSD OpenBSD 2.9.0
- OpenBSD OpenBSD 3.0
- SGI IRIX 6.5.0
- SGI IRIX 6.5.1
- SGI IRIX 6.5.10
- SGI IRIX 6.5.11
- SGI IRIX 6.5.12
- SGI IRIX 6.5.13
- SGI IRIX 6.5.14
- SGI IRIX 6.5.15
- SGI IRIX 6.5.16
- SGI IRIX 6.5.2
- SGI IRIX 6.5.3
- SGI IRIX 6.5.4
- SGI IRIX 6.5.5
- SGI IRIX 6.5.6
- SGI IRIX 6.5.7
- SGI IRIX 6.5.8
- SGI IRIX 6.5.9
References:
- Apple: Mac OS X Update 10.1.4: Information and Download
- FreeBSD: FreeBSD Homepage
- FreeBSD: Problem Report misc/35022: network broadcast addresses may be used for communica
- NetBSD: NetBSD Homepage
- OpenBSD: OpenBSD Homepage
Juniper Networks provides this content via a wide variety of sources and production methods. If notified of errors or omissions in the content of this page, Juniper Networks, at its discretion, will modify or remove the page or leave the content as is, depending on various factors including but not limited to the reputation and authority of the party providing the notification. Please use the contact information displayed elsewhere on this page to report any errors or omissions regarding the content on this page.
