bugtraq - FreeBSD Security Advisory FreeBSD-SA-15:21.amd64

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Message-Id: <20150825212749.A0D7516B8@freefall.freebsd.org>
Date: Tue, 25 Aug 2015 21:27:49 +0000 (UTC)
From: FreeBSD Security Advisories <security-advisories@...ebsd.org>
To: Bugtraq <bugtraq@...urityfocus.com>
Subject: FreeBSD Security Advisory FreeBSD-SA-15:21.amd64

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

=============================================================================
FreeBSD-SA-15:21.amd64                                      Security Advisory
                                                          The FreeBSD Project

Topic:          Local privilege escalation in IRET handler

Category:       core
Module:         sys_amd64
Announced:      2015-08-25
Credits:        Konstantin Belousov, Andrew Lutomirski
Affects:        FreeBSD 9.3 and FreeBSD 10.1
Corrected:      2015-03-31 00:59:30 UTC (stable/10, 10.1-STABLE)
                2015-08-25 20:48:58 UTC (releng/10.1, 10.1-RELEASE-p19)
                2015-03-31 01:08:51 UTC (stable/9, 9.3-STABLE)
                2015-08-25 20:49:05 UTC (releng/9.3, 9.3-RELEASE-p24)
CVE Name:       CVE-2015-5675

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.

I.   Background

FreeBSD/amd64 is commonly used on 64bit systems with AMD and Intel
CPU's.

The GS segment CPU register is used by both user processes and the
kernel to conveniently access state data: 32-bit user processes use the
register to manage per-thread data, while the kernel uses it to access
per-processor data.

The return from interrupt (IRET) instruction returns program control
from an interrupt handler to the interrupted context.

II.  Problem Description

If the kernel-mode IRET instruction generates an #SS or #NP exception,
but the exception handler does not properly ensure that the right GS
register base for kernel is reloaded, the userland GS segment may be
used in the context of the kernel exception handler.

III. Impact

By causing an IRET with #SS or #NP exceptions, a local attacker can
cause the kernel to use an arbitrary GS base, which may allow escalated
privileges or panic the system.

IV.  Workaround

No workaround is available.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date,
and reboot the system.

2) To update your vulnerable system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

And reboot the system.

3) To update your vulnerable system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch https://security.FreeBSD.org/patches/SA-15:21/amd64.patch
# fetch https://security.FreeBSD.org/patches/SA-15:21/amd64.patch.asc
# gpg --verify amd64.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile your kernel as described in
<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
system.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/9/                                                         r280877
releng/9.3/                                                       r287147
stable/10/                                                        r280875
releng/10.1/                                                      r287146
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-5675>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-15:21.amd64.asc>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.1.7 (FreeBSD)
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=nHGY
-----END PGP SIGNATURE-----