Bug 270333

Summary:	Kernel: nfs: Fix NFS v4 client handling of MAY_EXEC in nfs_permission. (CVE-2009-1630)
Product:	Gentoo Security	Reporter:	Robert Buchholz (RETIRED) <rbu>
Component:	Kernel	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	normal	CC:	hardened-kernel+disabled, kernel
Priority:	High
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7ee2cb7f32b299c2b06a31fde155457203e4b7dd
Whiteboard:	[linux <2.6.27.25] [linux >=2.6.28 <2.6.29.5]
Package list:		Runtime testing required:	---

Description Robert Buchholz (RETIRED) gentoo-dev

2009-05-18 17:50:28 UTC

CVE-2009-1630 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2009-1630):
  The nfs_permission function in fs/nfs/dir.c in the NFS client
  implementation in the Linux kernel 2.6.29.3 and earlier, when
  atomic_open is available, does not check execute (aka EXEC or
  MAY_EXEC) permission bits, which allows local users to bypass
  permissions and execute files, as demonstrated by files on an NFSv4
  fileserver.

Comment 1 Robert Buchholz (RETIRED) gentoo-dev

2009-05-18 17:51:02 UTC

No idea why this is not yet upstream.

Comment 2 Toralf Förster gentoo-dev

2009-05-19 07:57:32 UTC

http://lkml.org/lkml/2009/5/18/436