Articles / SuSE: New Linux kernel pack…

SuSE: New Linux kernel packages fix remote denial of service

This kernel update for the SUSE Linux Enterprise 10 SP3 kernel fixes several security issues and bugs. A memory leak in the ethtool ioctl was fixed that could disclose kernel memory to local attackers with CAP_NET_ADMIN privileges. The dvb_ca_ioctl function did not check the sign of a certain integer field, which allowed local users to cause a denial of service (memory corruption) or possibly have unspecified other impact via a negative value. The ax25_getname function did not initialize a certain structure, which allowed local users to obtain potentially sensitive information from kernel stack memory by reading a copy of this structure.

The Linux kernel did not properly initialize certain structure members, which allowed local users to obtain potentially sensitive information from kernel stack memory by leveraging the CAP_NET_RAW capability to read copies of the applicable structures. The get_name function did not initialize a certain structure, which allowed local users to obtain potentially sensitive information from kernel stack memory by reading a copy of this structure. A stack memory information leak in the xfs FSGEOMETRY_V1 ioctl was fixed.

The task_show_regs function allowed local users to obtain the values of the registers of an arbitrary process by reading a status file under /proc/. The sctp_process_unk_param function allowed remote attackers to cause a denial of service (system crash) via an SCTPChunkInit packet containing multiple invalid parameters that require a large amount of error data. The uart_get_count function did not properly initialize a certain structure member, which allowed local users to obtain potentially sensitive information from kernel stack memory via a TIOCGICOUNT ioctl call.

The rs_ioctl function did not properly initialize a certain structure member, which allowed local users to obtain potentially sensitive information from kernel stack memory via a TIOCGICOUNT ioctl call. The ntty_ioctl_tiocgicount function did not properly initialize a certain structure member, which allowed local users to obtain potentially sensitive information from kernel stack memory via a TIOCGICOUNT ioctl call. The OSS sound subsystem incorrectly expected that a certain name field ends with a ‘0’ character, which allowed local users to conduct buffer overflow attacks and gain privileges, or possibly obtain sensitive information from kernel memory.

A race condition in the __exit_signal function allowed local users to cause a denial of service via vectors related to multi threaded exec. The blk_rq_map_user_iov function allowed local users to cause a denial of service (panic) via a zero-length I/O request in a device ioctl to a SCSI device, related to an unaligned map. The hci_uart_tty_open function in the HCI UART driver did not verify whether the tty has a write operation, which allowed local users to cause a denial of service (NULL pointer dereference) via vectors related to the Bluetooth driver. An integer underflow in the irda_getsockopt function allowed local users to obtain potentially sensitive information from kernel heap memory via an IRLMP_ENUMDEVICES getsockopt call.

The aun_incoming function allowed remote attackers to cause a denial of service (NULL pointer dereference and OOPS) by sending an Acorn Universal Networking (AUN) packet over UDP. A race condition in the sctp_icmp_proto_unreachable function allowed remote attackers to cause a denial of service (panic).

Updated packages are available from download.opensuse.org.

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Hash: SHA1

______________________________________________________________________________

SUSE Security Announcement

Package: kernel
Announcement ID: SUSE-SA:2011:015
Date: Thu, 24 Mar 2011 16:00:00 +0000
Affected Products: SLE SDK 10 SP3
SUSE Linux Enterprise Desktop 10 SP3
SUSE Linux Enterprise Server 10 SP3
Vulnerability Type: remote denial of service
CVSS v2 Base Score: 7.1 (AV:N/AC:M/Au:N/C:N/I:N/A:C)
SUSE Default Package: yes
Cross-References: CVE-2010-1173, CVE-2010-3875, CVE-2010-3876
CVE-2010-3877, CVE-2010-4075, CVE-2010-4076
CVE-2010-4077, CVE-2010-4163, CVE-2010-4242
CVE-2010-4248, CVE-2010-4342, CVE-2010-4526
CVE-2010-4527, CVE-2010-4529, CVE-2010-4655
CVE-2010-4668, CVE-2011-0521, CVE-2011-0710
CVE-2011-0711

Content of This Advisory:
1) Security Vulnerability Resolved:
Linux kernel security update
Problem Description
2) Solution or Work-Around
3) Special Instructions and Notes
4) Package Location and Checksums
5) Pending Vulnerabilities, Solutions, and Work-Arounds:
See SUSE Security Summary Report.
6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

This kernel update for the SUSE Linux Enterprise 10 SP3 kernel fixes several
security issues and bugs.

Following security issues were fixed:
CVE-2010-4655: A memory leak in the ethtool ioctl was fixed that could
disclose kernel memory to local attackers with CAP_NET_ADMIN privileges.

CVE-2011-0521: The dvb_ca_ioctl function in
drivers/media/dvb/ttpci/av7110_ca.c in the Linux kernel did not check
the sign of a certain integer field, which allowed local users to cause
a denial of service (memory corruption) or possibly have unspecified
other impact via a negative value.

CVE-2010-3875: The ax25_getname function in net/ax25/af_ax25.c in the
Linux kernel did not initialize a certain structure, which allowed
local users to obtain potentially sensitive information from kernel
stack memory by reading a copy of this structure.

CVE-2010-3876: net/packet/af_packet.c in the Linux kernel did not properly
initialize certain structure members, which allowed local users to obtain
potentially sensitive information from kernel stack memory by leveraging
the CAP_NET_RAW capability to read copies of the applicable structures.

CVE-2010-3877: The get_name function in net/tipc/socket.c in the Linux
kernel did not initialize a certain structure, which allowed local users
to obtain potentially sensitive information from kernel stack memory by
reading a copy of this structure.

CVE-2011-0711: A stack memory information leak in the xfs FSGEOMETRY_V1
ioctl was fixed.

CVE-2011-0710: The task_show_regs function in arch/s390/kernel/traps.c
in the Linux kernel on the s390 platform allowed local users to obtain
the values of the registers of an arbitrary process by reading a status
file under /proc/.

CVE-2010-1173: The sctp_process_unk_param function in
net/sctp/sm_make_chunk.c in the Linux kernel, when SCTP is enabled,
allowed remote attackers to cause a denial of service (system crash)
via an SCTPChunkInit packet containing multiple invalid parameters that
require a large amount of error data.

CVE-2010-4075: The uart_get_count function in drivers/serial/serial_core.c
in the Linux kernel did not properly initialize a certain structure
member, which allowed local users to obtain potentially sensitive
information from kernel stack memory via a TIOCGICOUNT ioctl call.

CVE-2010-4076: The rs_ioctl function in drivers/char/amiserial.c in the
Linux kernel did not properly initialize a certain structure member,
which allowed local users to obtain potentially sensitive information
from kernel stack memory via a TIOCGICOUNT ioctl call.

CVE-2010-4077: The ntty_ioctl_tiocgicount function in
drivers/char/nozomi.c in the Linux kernel did not properly initialize a
certain structure member, which allowed local users to obtain potentially
sensitive information from kernel stack memory via a TIOCGICOUNT ioctl
call.

CVE-2010-4527: The load_mixer_volumes function in sound/oss/soundcard.c
in the OSS sound subsystem in the Linux kernel incorrectly expected
that a certain name field ends with a '0' character, which allowed
local users to conduct buffer overflow attacks and gain privileges,
or possibly obtain sensitive information from kernel memory, via a
SOUND_MIXER_SETLEVELS ioctl call.

CVE-2010-4248: Race condition in the __exit_signal function in
kernel/exit.c in the Linux kernel allowed local users to cause a denial
of service via vectors related to multi threaded exec, the use of a thread
group leader in kernel/posix-cpu-timers.c, and the selection of a new
thread group leader in the de_thread function in fs/exec.c.

CVE-2010-4668: The blk_rq_map_user_iov function in block/blk-map.c
in the Linux kernel allowed local users to cause a denial of service
(panic) via a zero-length I/O request in a device ioctl to a SCSI device,
related to an unaligned map. NOTE: this vulnerability exists because of
an incomplete fix for CVE-2010-4163.

CVE-2010-4242: The hci_uart_tty_open function in the HCI UART driver
(drivers/bluetooth/hci_ldisc.c) in the Linux kernel did not verify
whether the tty has a write operation, which allowed local users to cause
a denial of service (NULL pointer dereference) via vectors related to
the Bluetooth driver.

CVE-2010-4529: Integer underflow in the irda_getsockopt function in
net/irda/af_irda.c in the Linux kernel on platforms other than x86
allowed local users to obtain potentially sensitive information from
kernel heap memory via an IRLMP_ENUMDEVICES getsockopt call.

CVE-2010-4342: The aun_incoming function in net/econet/af_econet.c in
the Linux kernel, when Econet is enabled, allowed remote attackers to
cause a denial of service (NULL pointer dereference and OOPS) by sending
an Acorn Universal Networking (AUN) packet over UDP.

CVE-2010-4526: Race condition in the sctp_icmp_proto_unreachable function
in net/sctp/input.c in Linux kernel allowed remote attackers to cause
a denial of service (panic) via an ICMP unreachable message to a socket
that is already locked by a user, which causes the socket to be freed and
triggers list corruption, related to the sctp_wait_for_connect function.

2) Solution or Work-Around

There is no known workaround, please install the update packages.

3) Special Instructions and Notes

Please reboot the machine after installing the update.

4) Package Location and Checksums

The preferred method for installing security updates is to use the YaST
"Online Update" module or the "zypper" commandline tool. The package and
patch management stack will detect which updates are required and
automatically perform the necessary steps to verify and install them.

Alternatively, download the update packages for your distribution manually
and verify their integrity by the methods listed in Section 6 of this
announcement. Then install the packages using the command

rpm -Fhv <file.rpm>

to apply the update, replacing <file.rpm> with the filename of the
downloaded RPM package.

Our maintenance customers are notified individually. The packages are
offered for installation from the maintenance web:

SUSE Linux Enterprise Desktop 10 SP3 for AMD64 and Intel EM64T
http://download.novell.com/patch/finder/?keywords=2119b714456dc8c3d29661b68c7bee51

SUSE Linux Enterprise Server 10 SP3
http://download.novell.com/patch/finder/?keywords=2119b714456dc8c3d29661b68c7bee51
http://download.novell.com/patch/finder/?keywords=69931a7709e78d2b716e39859c3b56cb
http://download.novell.com/patch/finder/?keywords=cd9fb179a893a617ec3d3b82d167c2e5
http://download.novell.com/patch/finder/?keywords=cc92f236facf192053d5ac0bdb744a08
http://download.novell.com/patch/finder/?keywords=4765b4a51c34eb13231f2a67011c8cfc

SLE SDK 10 SP3
http://download.novell.com/patch/finder/?keywords=2119b714456dc8c3d29661b68c7bee51
http://download.novell.com/patch/finder/?keywords=cd9fb179a893a617ec3d3b82d167c2e5
http://download.novell.com/patch/finder/?keywords=cc92f236facf192053d5ac0bdb744a08
http://download.novell.com/patch/finder/?keywords=4765b4a51c34eb13231f2a67011c8cfc

SUSE Linux Enterprise Desktop 10 SP3
http://download.novell.com/patch/finder/?keywords=2119b714456dc8c3d29661b68c7bee51
http://download.novell.com/patch/finder/?keywords=4765b4a51c34eb13231f2a67011c8cfc

SUSE Linux Enterprise Desktop 10 SP3 for x86
http://download.novell.com/patch/finder/?keywords=4765b4a51c34eb13231f2a67011c8cfc

______________________________________________________________________________

5) Pending Vulnerabilities, Solutions, and Work-Arounds:

See SUSE Security Summary Report.
______________________________________________________________________________

6) Authenticity Verification and Additional Information

- Announcement authenticity verification:

SUSE security announcements are published via mailing lists and on Web
sites. The authenticity and integrity of a SUSE security announcement is
guaranteed by a cryptographic signature in each announcement. All SUSE
security announcements are published with a valid signature.

To verify the signature of the announcement, save it as text into a file
and run the command

gpg --verify <file>

replacing <file> with the name of the file where you saved the
announcement. The output for a valid signature looks like:

gpg: Signature made <DATE> using RSA key ID 3D25D3D9
gpg: Good signature from "SuSE Security Team <security@suse.de>"

where <DATE> is replaced by the date the document was signed.

If the security team's key is not contained in your key ring, you can
import it from the first installation CD. To import the key, use the
command

gpg --import gpg-pubkey-3d25d3d9-36e12d04.asc

- Package authenticity verification:

SUSE update packages are available on many mirror FTP servers all over the
world. While this service is considered valuable and important to the free
and open source software community, the authenticity and the integrity of
a package needs to be verified to ensure that it has not been tampered
with.

The internal rpm package signatures provide an easy way to verify the
authenticity of an RPM package. Use the command

rpm -v --checksig <file.rpm>

to verify the signature of the package, replacing <file.rpm> with the
filename of the RPM package downloaded. The package is unmodified if it
contains a valid signature from build@suse.de with the key ID 9C800ACA.

This key is automatically imported into the RPM database (on
RPMv4-based distributions) and the gpg key ring of 'root' during
installation. You can also find it on the first installation CD and at
the end of this announcement.

- SUSE runs two security mailing lists to which any interested party may
subscribe:

opensuse-security@opensuse.org
- General Linux and SUSE security discussion.
All SUSE security announcements are sent to this list.
To subscribe, send an e-mail to
<opensuse-security+subscribe@opensuse.org>.

opensuse-security-announce@opensuse.org
- SUSE's announce-only mailing list.
Only SUSE's security announcements are sent to this list.
To subscribe, send an e-mail to
<opensuse-security-announce+subscribe@opensuse.org>.

=====================================================================
SUSE's security contact is <security@suse.com> or <security@suse.de>.
The <security@suse.de> public key is listed below.
=====================================================================
______________________________________________________________________________

The information in this advisory may be distributed or reproduced,
provided that the advisory is not modified in any way. In particular, the
clear text signature should show proof of the authenticity of the text.

SUSE Linux Products GmbH provides no warranties of any kind whatsoever
with respect to the information contained in this security advisory.

Type Bits/KeyID Date User ID
pub 2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

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