3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
155 lines
5.9 KiB
Text
155 lines
5.9 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
|
|
Hash: SHA1
|
|
|
|
=============================================================================
|
|
FreeBSD-SA-06:08.ppp Security Advisory
|
|
The FreeBSD Project
|
|
|
|
Topic: Buffer overflow in sppp(4)
|
|
|
|
Category: core
|
|
Module: sys_net
|
|
Announced: 2006-08-23
|
|
Credits: Martin Husemann, Pavel Cahyna
|
|
Affects: All FreeBSD releases.
|
|
Corrected: 2006-08-23 22:01:44 UTC (RELENG_6, 6.1-STABLE)
|
|
2006-08-23 22:02:25 UTC (RELENG_6_1, 6.1-RELEASE-p4)
|
|
2006-08-23 22:02:52 UTC (RELENG_6_0, 6.0-RELEASE-p10)
|
|
2006-08-23 22:03:55 UTC (RELENG_5, 5.5-STABLE)
|
|
2006-08-23 22:04:28 UTC (RELENG_5_5, 5.5-RELEASE-p3)
|
|
2006-08-23 22:04:58 UTC (RELENG_5_4, 5.4-RELEASE-p17)
|
|
2006-08-23 22:05:49 UTC (RELENG_5_3, 5.3-RELEASE-p32)
|
|
2006-08-23 22:06:08 UTC (RELENG_4, 4.11-STABLE)
|
|
2006-08-23 22:06:40 UTC (RELENG_4_11, 4.11-RELEASE-p20)
|
|
CVE Name: CVE-2006-4304
|
|
|
|
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/>.
|
|
|
|
0. Revision History
|
|
|
|
v1.0 2006-08-23 Initial release.
|
|
v1.1 2006-08-25 Corrected name of affected driver.
|
|
|
|
NOTE WELL: The original version of this advisory identified the affected
|
|
driver as ppp(4). This is incorrect; the problem occurs in the sppp(4)
|
|
driver instead.
|
|
|
|
I. Background
|
|
|
|
The sppp(4) driver implements the state machine and the Link Control
|
|
Protocol (LCP) of the Point-to-Point Protocol (PPP) and is used in
|
|
combination with underlying drivers which provide synchronous
|
|
point-to-point connections. In particular, sppp(4) is commonly used
|
|
with i4bisppp(4) and ng_sppp(4).
|
|
|
|
II. Problem Description
|
|
|
|
While processing Link Control Protocol (LCP) configuration options received
|
|
from the remote host, sppp(4) fails to correctly validate option lengths.
|
|
This may result in data being read or written beyond the allocated kernel
|
|
memory buffer.
|
|
|
|
III. Impact
|
|
|
|
An attacker able to send LCP packets, including the remote end of a sppp(4)
|
|
connection, can cause the FreeBSD kernel to panic. Such an attacker may
|
|
also be able to obtain sensitive information or gain elevated privileges.
|
|
|
|
IV. Workaround
|
|
|
|
No workaround is available, but systems which do not use sppp(4) are not
|
|
vulnerable.
|
|
|
|
V. Solution
|
|
|
|
Perform one of the following:
|
|
|
|
1) Upgrade your vulnerable system to 4-STABLE, 5-STABLE, or 6-STABLE,
|
|
or to the RELENG_6_1, RELENG_6_0, RELENG_5_5, RELENG_5_4, RELENG_5_3,
|
|
or RELENG_4_11 security branch dated after the correction date.
|
|
|
|
2) To patch your present system:
|
|
|
|
The following patches have been verified to apply to FreeBSD 4.11, 5.3,
|
|
5.4, 5.5, 6.0, and 6.1 systems.
|
|
|
|
a) Download the relevant patch from the location below, and verify the
|
|
detached PGP signature using your PGP utility.
|
|
|
|
[FreeBSD 4.x]
|
|
# fetch http://security.FreeBSD.org/patches/SA-06:18/ppp4x.patch
|
|
# fetch http://security.FreeBSD.org/patches/SA-06:18/ppp4x.patch.asc
|
|
|
|
[FreeBSD 5.3]
|
|
# fetch http://security.FreeBSD.org/patches/SA-06:18/ppp53.patch
|
|
# fetch http://security.FreeBSD.org/patches/SA-06:18/ppp53.patch.asc
|
|
|
|
[FreeBSD 5.4, 5.5, and 6.x]
|
|
# fetch http://security.FreeBSD.org/patches/SA-06:18/ppp.patch
|
|
# fetch http://security.FreeBSD.org/patches/SA-06:18/ppp.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.
|
|
|
|
VI. Correction details
|
|
|
|
The following list contains the revision numbers of each file that was
|
|
corrected in FreeBSD.
|
|
|
|
Branch Revision
|
|
Path
|
|
- -------------------------------------------------------------------------
|
|
RELENG_4
|
|
src/sys/net/if_spppsubr.c 1.59.2.15
|
|
RELENG_4_11
|
|
src/UPDATING 1.73.2.91.2.21
|
|
src/sys/conf/newvers.sh 1.44.2.39.2.24
|
|
src/sys/net/if_spppsubr.c 1.59.2.13.10.1
|
|
RELENG_5
|
|
src/sys/net/if_spppsubr.c 1.113.2.3
|
|
RELENG_5_5
|
|
src/UPDATING 1.342.2.35.2.3
|
|
src/sys/conf/newvers.sh 1.62.2.21.2.5
|
|
src/sys/net/if_spppsubr.c 1.113.2.2.4.1
|
|
RELENG_5_4
|
|
src/UPDATING 1.342.2.24.2.26
|
|
src/sys/conf/newvers.sh 1.62.2.18.2.22
|
|
src/sys/net/if_spppsubr.c 1.113.2.2.2.1
|
|
RELENG_5_3
|
|
src/UPDATING 1.342.2.13.2.35
|
|
src/sys/conf/newvers.sh 1.62.2.15.2.37
|
|
src/sys/net/if_spppsubr.c 1.113.2.1.2.1
|
|
RELENG_6
|
|
src/sys/net/if_spppsubr.c 1.119.2.3
|
|
RELENG_6_1
|
|
src/UPDATING 1.416.2.22.2.6
|
|
src/sys/conf/newvers.sh 1.69.2.11.2.6
|
|
src/sys/net/if_spppsubr.c 1.119.2.2.2.1
|
|
RELENG_6_0
|
|
src/UPDATING 1.416.2.3.2.15
|
|
src/sys/conf/newvers.sh 1.69.2.8.2.11
|
|
src/sys/net/if_spppsubr.c 1.119.2.1.2.1
|
|
- -------------------------------------------------------------------------
|
|
|
|
VII. References
|
|
|
|
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4304
|
|
|
|
The latest revision of this advisory is available at
|
|
http://security.FreeBSD.org/advisories/FreeBSD-SA-06:18.ppp.asc
|
|
-----BEGIN PGP SIGNATURE-----
|
|
Version: GnuPG v1.4.3 (FreeBSD)
|
|
|
|
iD8DBQFE7u0+FdaIBMps37IRAhmDAKCVpSUMmugw8j5HEjMfSTln+3KdjwCeNKmx
|
|
Qna3jib3T9pASUWraImZYL0=
|
|
=XAoj
|
|
-----END PGP SIGNATURE-----
|