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]
Date: Thu, 14 Jan 2016 10:04:42 +0000 (UTC)
From: FreeBSD Security Advisories <security-advisories@...ebsd.org>
To: Bugtraq <bugtraq@...urityfocus.com>
Subject: FreeBSD Security Advisory FreeBSD-SA-16:03.linux

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

=============================================================================
FreeBSD-SA-16:03.linux                                      Security Advisory
                                                          The FreeBSD Project

Topic:          Linux compatibility layer incorrect futex handling

Category:       core
Module:         kernel
Announced:      2016-01-14
Credits:        Mateusz Guzik
Affects:        All supported versions of FreeBSD.
Corrected:      2016-01-14 09:11:42 UTC (stable/10, 10.2-STABLE)
                2016-01-14 09:10:46 UTC (releng/10.2, 10.2-RELEASE-p9)
                2016-01-14 09:11:16 UTC (releng/10.1, 10.1-RELEASE-p26)
                2016-01-14 09:11:48 UTC (stable/9, 9.3-STABLE)
                2016-01-14 09:11:26 UTC (releng/9.3, 9.3-RELEASE-p33)
CVE Name:       CVE-2016-1880

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

I.   Background

FreeBSD is binary-compatible with the Linux operating system through a
loadable kernel module/optional kernel component.  The support is
provided on amd64 and i386 machines.

II.  Problem Description

A programming error in the handling of Linux futex robust lists may result
in incorrect memory locations being accessed.

III. Impact

It is possible for a local attacker to read portions of kernel memory, which
may result in a privilege escalation. 

IV.  Workaround

No workaround is available, but systems not using the Linux binary
compatibility layer are not vulnerable.

The following command can be used to test if the Linux binary
compatibility layer is loaded:

# kldstat -m linuxelf

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.

Reboot the system or unload and reload the linux.ko kernel module.

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

Reboot the system or unload and reload the linux.ko kernel module.

2) 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 http://security.FreeBSD.org/patches/SA-16:03/linux.patch
# fetch http://security.FreeBSD.org/patches/SA-16:03/linux.patch.asc

b) Apply the patch.

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/amd64/linux32
# make sysent
# cd /usr/src/i386/linux
# make sysent

c) Recompile your kernel and modules as described in
<URL:http://www.FreeBSD.org/handbook/kernelconfig.html>.

Reboot the system or unload and reload the linux.ko kernel module.

VI.  Correction details

The following list contains the revision numbers of each file that was
corrected in FreeBSD.

Subversion:

Branch/path                                                      Revision
- ---------------------------------------------------------------------------
stable/9/                                                         r293898
releng/9.3/                                                       r293896
stable/10/                                                        r293897
releng/10.1/                                                      r293894
releng/10.2/                                                      r293893
- ---------------------------------------------------------------------------

VII. References

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1880>

The latest revision of this advisory is available at
<URL:http://security.FreeBSD.org/advisories/FreeBSD-SA-16:03.linux.asc>
-----BEGIN PGP SIGNATURE-----
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=OQft
-----END PGP SIGNATURE-----

Powered by blists - more mailing lists