BSD systems could allow attackers to reset arbitrary TCP connections

bsd-rst-dos (3377) The risk level is classified as MediumMedium Risk


BSD is vulnerable to a denial of service attack that could allow a remote attacker with limited knowledge to reset arbitrary TCP connections. TCP RST packets are used to terminate old connections that were not torn down during normal operation of the stream. A flaw in the way some systems interpret the sequence numbers in RST packets used for "authentication" could allow arbitrary connections to be terminated by a third party.


Denial of Service


This hole was fixed in OpenBSD 2.5 and FreeBSD 2.2.8 and 3.x. Users who wish to fix this hole but not upgrade their systems should review the security advisory from their vendor and apply the patch information. See References.


Platforms Affected:

  • FreeBSD FreeBSD 2.2
  • FreeBSD FreeBSD 2.2.1
  • 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 2.2.7
  • FreeBSD FreeBSD 2.2.8
  • OpenBSD OpenBSD 2.0
  • OpenBSD OpenBSD 2.1
  • OpenBSD OpenBSD 2.2
  • OpenBSD OpenBSD 2.3
  • OpenBSD OpenBSD 2.4


Oct 13, 1998

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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