J-Security Center

Title: BSD Kernel NFS Denial of Service Vulnerability

Severity: MODERATE

Description:

A denial of service condition exists in the BSD kernel. This condition is caused by data passed from userland via the Networking File System (NFS) package to the BSD kernel.

Specifically, the source of this problem is insufficient checks on the size of mount arguments, NFS file handles, and authenticator/verifier strings.

This condition may be exploited to cause a kernel panic. Although unconfirmed it is possible this issue may facilitate code execution.

This vulnerability is only exploitable in configurations where users are permitted to create mounts; it was disabled by default in NetBSD 1.5 and later.

It has been reported that this issue currently affects Apple Mac OS X 10.3 packages; it is possible that previous version of Mac OS X are also vulnerable.

Affected Products:

  • Apple Mac OS X 10.3.0
  • Apple Mac OS X 10.3.1
  • Apple Mac OS X 10.3.2
  • Apple Mac OS X 10.3.3
  • Apple Mac OS X 10.3.4
  • Apple Mac OS X 10.3.5
  • Apple Mac OS X 10.3.6
  • Apple Mac OS X Server 10.3.0
  • Apple Mac OS X Server 10.3.1
  • Apple Mac OS X Server 10.3.2
  • Apple Mac OS X Server 10.3.3
  • Apple Mac OS X Server 10.3.4
  • Apple Mac OS X Server 10.3.5
  • Apple Mac OS X Server 10.3.6
  • NetBSD NetBSD 1.4.0
  • NetBSD NetBSD 1.4.1
  • NetBSD NetBSD 1.4.2
  • NetBSD NetBSD 1.4.3
  • NetBSD NetBSD 1.5.0
  • NetBSD NetBSD 1.5.1
  • NetBSD NetBSD current pre20010805

References:

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