BSD systems could allow attackers to reset arbitrary TCP connections

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

Description:

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.


Consequences:

Denial of Service

Remedy:

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.

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

Reported:

Oct 13, 1998

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