SuSE: 2009-028: Linux kernel Security Update
Summary
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SUSE Security Announcement
Package: kernel
Announcement ID: SUSE-SA:2009:028
Date: Wed, 20 May 2009 18:00:00 +0000
Affected Products: SLE SDK 10 SP2
SUSE Linux Enterprise Desktop 10 SP2
SUSE Linux Enterprise 10 SP2 DEBUGINFO
SUSE Linux Enterprise Server 10 SP2
Vulnerability Type: potential remote code execution
Severity (1-10): 8
SUSE Default Package: yes
Cross-References: CVE-2009-0834, CVE-2009-0835, CVE-2009-0859
CVE-2009-1072, CVE-2009-1265, CVE-2009-1337
CVE-2009-1439
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
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1) Problem Description and Brief Discussion
The Linux kernel on SUSE Linux Enterprise 10 Service Pack 2 was
updated to fix various security issues and several bugs.
Following security issues were fixed:
CVE-2009-0834: The audit_syscall_entry function in the Linux kernel
on the x86_64 platform did not properly handle (1) a 32-bit process
making a 64-bit syscall or (2) a 64-bit process making a 32-bit
syscall, which allows local users to bypass certain syscall audit
configurations via crafted syscalls.
CVE-2009-1072: nfsd in the Linux kernel did not drop the CAP_MKNOD
capability before handling a user request in a thread, which allows
local users to create device nodes, as demonstrated on a filesystem
that has been exported with the root_squash option.
CVE-2009-0835: The __secure_computing function in kernel/seccomp.c
in the seccomp subsystem in the Linux kernel on the x86_64 platform,
when CONFIG_SECCOMP is enabled, does not properly handle (1) a 32-bit
process making a 64-bit syscall or (2) a 64-bit process making a
32-bit syscall, which allows local users to bypass intended access
restrictions via crafted syscalls that are misinterpreted as (a)
stat or (b) chmod.
CVE-2009-1439: Buffer overflow in fs/cifs/connect.c in CIFS in the
Linux kernel 2.6.29 and earlier allows remote attackers to cause
a denial of service (crash) or potential code execution via a long
nativeFileSystem field in a Tree Connect response to an SMB mount
request.
This requires that kernel can be made to mount a "cifs" filesystem from a
malicious CIFS server.
CVE-2009-1337: The exit_notify function in kernel/exit.c in the Linux
kernel did not restrict exit signals when the CAP_KILL capability
is held, which allows local users to send an arbitrary signal to a
process by running a program that modifies the exit_signal field and
then uses an exec system call to launch a setuid application.
CVE-2009-0859: The shm_get_stat function in ipc/shm.c in the shm
subsystem in the Linux kernel, when CONFIG_SHMEM is disabled,
misinterprets the data type of an inode, which allows local users to cause a denial of service (system hang) via an SHM_INFO shmctl
call, as demonstrated by running the ipcs program. (SUSE is enabling
CONFIG_SHMEM, so is by default not affected, the fix is just for
completeness).
The GCC option -fwrapv has been added to compilation to work around
potentially removing integer overflow checks.
CVE-2009-1265: Integer overflow in rose_sendmsg (sys/net/af_rose.c) in
the Linux kernel might allow attackers to obtain sensitive information
via a large length value, which causes "garbage" memory to be sent.
Also a number of bugs were fixed, for details please see the RPM
changelog.
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 (YOU) tool. YOU detects which updates are required and
automatically performs 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
References
