c4d9a19be3
transmission which could be tricked into rounding up to the nearest page size, leaking up to a page of kernel memory. [13:11] In IPv6 and NetATM, stop SIOCSIFADDR, SIOCSIFBRDADDR, SIOCSIFDSTADDR and SIOCSIFNETMASK at the socket layer rather than pass them on to the link layer without validation or credential checks. [SA-13:12] Prevent cross-mount hardlinks between different nullfs mounts of the same underlying filesystem. [SA-13:13] Security: CVE-2013-5666 Security: FreeBSD-SA-13:11.sendfile Security: CVE-2013-5691 Security: FreeBSD-SA-13:12.ifioctl Security: CVE-2013-5710 Security: FreeBSD-SA-13:13.nullfs Approved by: so
126 lines
4.3 KiB
Text
126 lines
4.3 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
|
|
Hash: SHA1
|
|
|
|
=============================================================================
|
|
FreeBSD-SA-13:11.sendfile Security Advisory
|
|
The FreeBSD Project
|
|
|
|
Topic: Kernel memory disclosure in sendfile(2)
|
|
|
|
Category: core
|
|
Module: sendfile
|
|
Announced: 2013-09-10
|
|
Credits: Ed Maste
|
|
Affects: FreeBSD 9.2-RC1 and 9.2-RC2
|
|
Corrected: 2013-09-10 10:07:21 UTC (stable/9, 9.2-STABLE)
|
|
2013-09-10 10:08:20 UTC (releng/9.2, 9.2-RC1-p2)
|
|
2013-09-10 10:08:20 UTC (releng/9.2, 9.2-RC2-p2)
|
|
CVE Name: CVE-2013-5666
|
|
|
|
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
|
|
|
|
The sendfile(2) system call allows a server application (such as an
|
|
HTTP or FTP server) to transmit the contents of a file over a network
|
|
connection without first copying it to application memory. High
|
|
performance servers such as Apache and ftpd use sendfile.
|
|
|
|
II. Problem Description
|
|
|
|
On affected systems, if the length passed to sendfile(2) is non-zero
|
|
and greater than the length of the file being transmitted, sendfile(2)
|
|
will pad the transmission up to the requested length or the next
|
|
pagesize boundary, whichever is smaller.
|
|
|
|
The content of the additional bytes transmitted in this manner depends
|
|
on the underlying filesystem, but may potentially include information
|
|
useful to an attacker.
|
|
|
|
III. Impact
|
|
|
|
An unprivileged user with the ability to run arbitrary code may be
|
|
able to obtain arbitrary kernel memory contents.
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
[FreeBSD 9.2-STABLE]
|
|
# fetch http://security.FreeBSD.org/patches/SA-13:11/sendfile-9.2-stable.patch
|
|
# fetch http://security.FreeBSD.org/patches/SA-13:11/sendfile-9.2-stable.patch.asc
|
|
# gpg --verify sendfile-9.2-stable.patch.asc
|
|
|
|
[FreeBSD 9.2-RC1 and 9.2-RC2]
|
|
# fetch http://security.FreeBSD.org/patches/SA-13:11/sendfile-9.2-rc.patch
|
|
# fetch http://security.FreeBSD.org/patches/SA-13:11/sendfile-9.2-rc.patch.asc
|
|
# gpg --verify sendfile-9.2-rc.patch.asc
|
|
|
|
b) Apply the patch.
|
|
|
|
# cd /usr/src
|
|
# patch < /path/to/patch
|
|
|
|
c) Recompile your kernel as described in
|
|
<URL:http://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
|
|
system.
|
|
|
|
3) 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
|
|
|
|
VI. Correction details
|
|
|
|
The following list contains the correction revision numbers for each
|
|
affected branch.
|
|
|
|
Branch/path Revision
|
|
- -------------------------------------------------------------------------
|
|
stable/9/ r255443
|
|
releng/9.2/ r255444
|
|
- -------------------------------------------------------------------------
|
|
|
|
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:http://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
|
|
|
|
VII. References
|
|
|
|
<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-5666>
|
|
|
|
The latest revision of this advisory is available at
|
|
<URL:http://security.FreeBSD.org/advisories/FreeBSD-SA-13:11.sendfile.asc>
|
|
-----BEGIN PGP SIGNATURE-----
|
|
Version: GnuPG v1.4.14 (FreeBSD)
|
|
|
|
iEYEARECAAYFAlIu8rIACgkQFdaIBMps37K01ACgmwaW3PZhjDqWSlTHusjIPNVy
|
|
A/YAn3DFUAvlX8sH89taM+sedjbD5In8
|
|
=gZwu
|
|
-----END PGP SIGNATURE-----
|