FreeBSD memory buffers (mbufs) denial of service
| freebsd-mbuf-dos (15369) |  Medium Risk |
Description:
FreeBSD is vulnerable to a denial of service, caused by a vulnerability in the memory buffers (mbufs). A remote attacker could send multiple TCP packets in an improper sequence to cause the system to stop processing new connections.
Consequences:
Denial of Service
Remedy:
For FreeBSD:
Upgrade to FreeBSD 4-STABLE or to the appropriate RELENG security branch dated after 2004-03-02, as listed in FreeBSD Security Advisory FreeBSD-SA-04:04.tcp. See References.
— OR —
Apply the appropriate patch for your system, as listed in FreeBSD Security Advisory FreeBSD-SA-04:04.tcp. See References.
For SGI IRIX:
Apply the appropriate patch for your system, as listed in SGI Security Advisory 20040905-01-P. See References.
References:
- FreeBSD Security Advisory FreeBSD-SA-04:04: many out-of-sequence TCP packets denial-of-service.
- FreeBSD Security Mailing List, Wed, 18 Feb 2004 16:02:30 -0600: Fwd: [is this mbuf problem real?].
- BID-9792: BSD Out Of Sequence Packets Remote Denial Of Service Vulnerability
- CVE-2004-0171: FreeBSD 5.1 and earlier, and Mac OS X before 10.3.4, allows remote attackers to cause a denial of service (resource exhaustion of memory buffers and system crash) via a large number of out-of-sequence TCP packets, which prevents the operating system from creating new connections.
- OSVDB ID: 4124: Multiple BSD mbufs Out-of-Sequence TCP Packet DoS
- US-CERT VU#395670: FreeBSD fails to limit number of TCP segments held in reassembly queue
Platforms Affected:
- FreeBSD FreeBSD 4.0
- FreeBSD FreeBSD 5.1
- SGI IRIX 6.5.22
- SGI IRIX 6.5.23
- SGI IRIX 6.5.24
- SGI IRIX 6.5.25
Reported:
Mar 01, 2004
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