From security-advisories at FreeBSD.org Thu Feb 14 04:10:42 2008
From: security-advisories at FreeBSD.org (FreeBSD Security Advisories)
Date: Thu Feb 14 04:10:54 2008
Subject: FreeBSD Security Advisory FreeBSD-SA-08:03.sendfile
Message-ID: <200802141210.m1ECAgOI071161@freefall.freebsd.org>
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
=============================================================================
FreeBSD-SA-08:03.sendfile Security Advisory
The FreeBSD Project
Topic: sendfile(2) write-only file permission bypass
Category: core
Module: sys_kern
Announced: 2008-02-14
Credits: Kostik Belousov
Affects: All supported versions of FreeBSD
Corrected: 2008-02-14 11:45:00 UTC (RELENG_7, 7.0-PRERELEASE)
2008-02-14 11:45:41 UTC (RELENG_7_0, 7.0-RELEASE)
2008-02-14 11:46:08 UTC (RELENG_6, 6.3-STABLE)
2008-02-14 11:46:41 UTC (RELENG_6_3, 6.3-RELEASE-p1)
2008-02-14 11:47:06 UTC (RELENG_6_2, 6.2-RELEASE-p11)
2008-02-14 11:47:39 UTC (RELENG_6_1, 6.1-RELEASE-p23)
2008-02-14 11:49:39 UTC (RELENG_5, 5.5-STABLE)
2008-02-14 11:50:28 UTC (RELENG_5_5, 5.5-RELEASE-p19)
CVE Name: CVE-2008-0777
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit .
I. Background
The sendfile(2) system call allows a server application (such as a
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 the Apache HTTP Server and ftpd use sendfile.
II. Problem Description
When a process opens a file (and other file system objects, such as
directories), it specifies access flags indicating its intent to read,
write, or perform other operations. These flags are checked against
file system permissions, and then stored in the resulting file
descriptor to validate future operations against.
The sendfile(2) system call does not check the file descriptor access
flags before sending data from a file.
III. Impact
If a file is write-only, a user process can open the file and use
sendfile to send the content of the file over a socket, even though the
user does not have read access to the file, resulting in possible
disclosure of sensitive information.
IV. Workaround
No workaround is available, but systems are only vulnerable if
write-only files exist, which are not widely used.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 5-STABLE, 6-STABLE, or
7.0-PRERELEASE, or to the RELENG_7_0, RELENG_6_3, RELENG_6_2,
RELENG_6_1, or RELENG_5_5 security branch dated after the correction
date.
2) To patch your present system:
The following patches have been verified to apply to FreeBSD 5.5, 6.1,
6.2, 6.3, and 7.0 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
[FreeBSD 6.2, 6.3, and 7.0]
# fetch http://security.FreeBSD.org/patches/SA-08:03/sendfile.patch
# fetch http://security.FreeBSD.org/patches/SA-08:03/sendfile.patch.asc
[FreeBSD 6.1]
# fetch http://security.FreeBSD.org/patches/SA-08:03/sendfile61.patch
# fetch http://security.FreeBSD.org/patches/SA-08:03/sendfile61.patch.asc
[FreeBSD 5.5]
# fetch http://security.FreeBSD.org/patches/SA-08:03/sendfile55.patch
# fetch http://security.FreeBSD.org/patches/SA-08:03/sendfile55.patch.asc
b) Apply the patch.
# cd /usr/src
# patch < /path/to/patch
c) Recompile your kernel as described in
and reboot the
system.
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
Branch Revision
Path
- -------------------------------------------------------------------------
RELENG_5
src/sys/kern/kern_descrip.c 1.243.2.11
RELENG_5_5
src/UPDATING 1.342.2.35.2.20
src/sys/conf/newvers.sh 1.62.2.21.2.21
src/sys/kern/kern_descrip.c 1.243.2.9.2.1
RELENG_6
src/sys/kern/kern_descrip.c 1.279.2.16
src/sys/kern/uipc_syscalls.c 1.221.2.5
RELENG_6_3
src/UPDATING 1.416.2.37.2.5
src/sys/conf/newvers.sh 1.69.2.15.2.4
src/sys/kern/kern_descrip.c 1.279.2.15.2.1
src/sys/kern/uipc_syscalls.c 1.221.2.4.4.1
RELENG_6_2
src/UPDATING 1.416.2.29.2.15
src/sys/conf/newvers.sh 1.69.2.13.2.14
src/sys/kern/kern_descrip.c 1.279.2.9.2.1
src/sys/kern/uipc_syscalls.c 1.221.2.4.2.1
RELENG_6_1
src/UPDATING 1.416.2.22.2.26
src/sys/conf/newvers.sh 1.69.2.11.2.25
src/sys/kern/kern_descrip.c 1.279.2.6.2.1
src/sys/kern/uipc_syscalls.c 1.221.2.1.2.1
RELENG_7
src/sys/kern/kern_descrip.c 1.313.2.1
src/sys/kern/uipc_syscalls.c 1.259.2.2
RELENG_7_0
src/UPDATING 1.507.2.3.2.3
src/sys/kern/kern_descrip.c 1.313.4.1
src/sys/kern/uipc_syscalls.c 1.259.4.2
- -------------------------------------------------------------------------
VII. References
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0777
The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-08:03.sendfile.asc
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.8 (FreeBSD)
iD8DBQFHtC0DFdaIBMps37IRAqp8AJ91+flnCIUSvKoFQyXfD1YTnPnuqgCcDiPJ
SR4X1dNFENsHMq9ROrQhr1c=
=TX1R
-----END PGP SIGNATURE-----
From security-advisories at FreeBSD.org Thu Feb 14 04:11:31 2008
From: security-advisories at FreeBSD.org (FreeBSD Security Advisories)
Date: Thu Feb 14 04:11:39 2008
Subject: FreeBSD Security Advisory FreeBSD-SA-08:04.ipsec
Message-ID: <200802141211.m1ECBV0j071251@freefall.freebsd.org>
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
=============================================================================
FreeBSD-SA-08:04.ipsec Security Advisory
The FreeBSD Project
Topic: IPsec null pointer dereference panic
Category: core
Module: ipsec
Announced: 2008-02-14
Credits: Takashi Sogabe, Tatuya Jinmei
Affects: FreeBSD 5.5
Corrected: 2008-02-14 11:49:39 UTC (RELENG_5, 5.5-STABLE)
2008-02-14 11:50:28 UTC (RELENG_5_5, 5.5-RELEASE-p19)
CVE Name: CVE-2008-0177
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit .
I. Background
The IPsec suite of protocols provide network level security for IPv4
and IPv6 packets. FreeBSD includes software originally developed by
the KAME project which implements the various protocols that make up
IPsec.
II. Problem Description
There is an improper reference to a data structure in the processing of
IPsec packets, which can result in a NULL pointer being dereferenced.
III. Impact
A single specifically crafted IPv6 packet could cause the kernel to panic,
when the kernel had been configured to process IPsec and IPv6 traffic.
This requires IPSEC to be compiled into the kernel, it does not necessarily
have to be configured at that point.
IV. Workaround
No workaround is available, but kernels which does not include IPsec
support are not vulnerable. The GENERIC and SMP kernel configurations
distributed with FreeBSD releases do not include IPsec support.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 5-STABLE, or to the RELENG_5_5
security branch dated after the correction date.
2) To patch your present system:
The following patches have been verified to apply to FreeBSD 5.5 systems.
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-08:04/ipsec.patch
# fetch http://security.FreeBSD.org/patches/SA-08:04/ipsec.patch.asc
b) Apply the patch.
# cd /usr/src
# patch < /path/to/patch
c) Recompile your kernel as described in
and reboot the
system.
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
Branch Revision
Path
- -------------------------------------------------------------------------
RELENG_5
src/sys/netinet6/ipcomp_input.c 1.7.4.2
RELENG_5_5
src/UPDATING 1.342.2.35.2.20
src/sys/conf/newvers.sh 1.62.2.21.2.21
src/sys/netinet6/ipcomp_input.c 1.7.4.1.4.1
- -------------------------------------------------------------------------
VII. References
http://www.kb.cert.org/vuls/id/110947
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0177
The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-08:04.ipsec.asc
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.8 (FreeBSD)
iD8DBQFHtC0HFdaIBMps37IRAt5gAKCGnYEX3r7n0Dsypmfv2m1J9pgICwCfd6uH
Gy2w6OYNovnfrb7EN0jWCjM=
=jHy3
-----END PGP SIGNATURE-----