NetBSD-Announce archive

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]

NetBSD Security Advisory 2017-001: Memory leak in the connect system call

Hash: SHA1

		NetBSD Security Advisory 2017-001

Topic:		Memory leak in the connect system call

Version:	NetBSD-current:		source prior to Sun, Oct 31st 2016
		NetBSD 7.0 - 7.0.2:	affected
		NetBSD 6.1 - 6.1.4:	affected
		NetBSD 6.0 - 6.0.5:	affected

Severity:	Local DoS

Fixed:		NetBSD-current:		Sun, Oct 31st 2016
		NetBSD-7-0 branch:	Tue, Nov 1st 2016
		NetBSD-7 branch:	Tue, Nov 1st 2016
		NetBSD-6-0 branch:	Fri, Nov 11th 2016
		NetBSD-6-1 branch:	Fri, Nov 11th 2016
		NetBSD-6 branch:	Fri, Nov 11th 2016

Teeny versions released later than the fix date will contain the fix.

Please note that NetBSD releases prior to 6.0 are no longer supported.
It is recommended that all users upgrade to a supported release.


A memory leak in the kernel could allow a local user to use up kernel
memory via repeated calls to the connect system call, and thus to
freeze - or eventually panic - the system.

Technical Details

When calling the connect system call on a particular file descriptor with
specific arguments, a kernel buffer allocated to temporarily hold a path
buffer was not freed. Performing such a call in a loop would cause the
kernel to run out of memory and eventually panic.

Solutions and Workarounds

For all NetBSD versions, you need to obtain fixed kernel sources,
rebuild and install the new kernel, and reboot the system.

The fixed source may be obtained from the NetBSD CVS repository.
The following instructions briefly summarise how to upgrade your
kernel. In these instructions, replace:

  ARCH     with your architecture (from uname -m),
  KERNCONF with the name of your kernel configuration file and
  VERSION  with the file version below

File versions containing the fixes:

 FILE  HEAD   netbsd-7   netbsd-7-0    netbsd-6   netbsd-6-1    netbsd-6-0
 ----  ----   --------   ----------    --------   ----------    ----------

To update from CVS, re-build, and re-install the kernel:

	# cd src
	# cvs update -d -P -r VERSION sys/kern/uipc_usrreq.c
	# ./ kernel=KERNCONF
	# mv /netbsd /netbsd.old
	# cp sys/arch/ARCH/compile/obj/KERNCONF/netbsd /netbsd
	# shutdown -r now

For more information on how to do this, see:

Thanks To

The Mootja Analysis Engine for detecting the issue, Maxime Villard for
developing it and writing a fix.

Revision History

	2017-01-21	Initial release

More Information

Advisories may be updated as new information becomes available.
The most recent version of this advisory (PGP signed) can be found at

Information about NetBSD and NetBSD security can be found at and .

Copyright 2017, The NetBSD Foundation, Inc.  All Rights Reserved.
Redistribution permitted only in full, unmodified form.

Version: GnuPG v1


Home | Main Index | Thread Index | Old Index