[RHSA-2009:1081-01] Important: kernel-rt security and bug fix update

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Red Hat Security Advisory

 

Synopsis: Important: kernel-rt security and bug fix update

Advisory ID: RHSA-2009:1081-01

Product: Red Hat Enterprise MRG for RHEL-5

Advisory URL: https://rhn.redhat.com/errata/RHSA-2009-1081.html

Issue date: 2009-06-03

CVE Names: CVE-2009-1072 CVE-2009-1192 CVE-2009-1338

CVE-2009-1439

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1. Summary:

 

Updated kernel-rt packages that fix several security issues and various

bugs are now available for Red Hat Enterprise MRG 1.1.3.

 

This update has been rated as having important security impact by the Red

Hat Security Response Team.

 

2. Relevant releases/architectures:

 

MRG Realtime for RHEL 5 Server - i386, noarch, x86_64

 

3. Description:

 

The kernel-rt packages contain the Linux kernel, the core of any Linux

operating system.

 

These updated packages fix the following security issues:

 

* a buffer overflow flaw was found in the CIFSTCon() function of the Linux

kernel Common Internet File System (CIFS) implementation. When mounting a

CIFS share, a malicious server could send an overly-long string to the

client, possibly leading to a denial of service or privilege escalation on

the client mounting the CIFS share. (CVE-2009-1439, Important)

 

* the Linux kernel Network File System daemon (nfsd) implementation did not

drop the CAP_MKNOD capability when handling requests from local,

unprivileged users. This flaw could possibly lead to an information leak or

privilege escalation. (CVE-2009-1072, Moderate)

 

* a deficiency was found in the Linux kernel signals implementation. The

kill_something_info() function did not check if a process was outside the

caller's namespace before sending the kill signal, making it possible to

kill processes in all process ID (PID) namespaces, breaking PID namespace

isolation. (CVE-2009-1338, Moderate)

 

* a flaw was found in the AGPGART driver. The agp_generic_alloc_page() and

agp_generic_alloc_pages() functions did not zero out the memory pages they

allocate, which may later be available to user-space processes. This flaw

could possibly lead to an information leak. (CVE-2009-1192, Low)

 

These updated packages also fix the following bugs:

 

* the "-fwrapv" flag was added to the gcc build options to prevent gcc from

optimizing away wrapping arithmetic, as optimizing away wrapping may lead

to unexpected results. (BZ#491264)

 

* the bnx2x driver may have failed when highly-stressed by network

stress-tests, resulting in network access being unavailable. This driver

has been updated to resolve this issue. (BZ#495472)

 

* the file system mask, which lists capabilities for users with a file

system user ID (fsuid) of 0, was missing the CAP_MKNOD and

CAP_LINUX_IMMUTABLE capabilities. This could, potentially, allow users with

an fsuid other than 0 to perform actions on some file system types that

would otherwise be prevented. This update adds these capabilities.

(BZ#497047)

 

* "/proc/[pid]/maps" and "/proc/[pid]/smaps" can only be read by processes

able to use the ptrace() call on a given process; however, certain

information from "/proc/[pid]/stat" and "/proc/[pid]/wchan" could be used

to reconstruct memory maps, making it possible to bypass the Address Space

Layout Randomization (ASLR) security feature. This update addresses this

issue. (BZ#499550)

 

* the get_random_int() function returned the same number until the jiffies

counter (which ticks at a clock interrupt frequency) or process ID (PID)

changed, making it possible to predict the random numbers. This may have

helped to bypass the ASLR security feature. With this update,

get_random_int() is more random and no longer uses a common seed value.

This reduces the possibility of predicting the values get_random_int()

returns. (BZ#499787)

 

All Red Hat Enterprise MRG users should upgrade to these updated packages,

which contain backported patches to resolve these issues. Note: The system

must be rebooted for this update to take effect.

 

4. Solution:

 

Before applying this update, make sure that all previously-released

errata relevant to your system have been applied.

 

This update is available via Red Hat Network. Details on how to use

the Red Hat Network to apply this update are available at

http://kbase.redhat.com/faq/docs/DOC-11259

 

5. Bugs fixed (http://bugzilla.redhat.com/):

 

491264 - kernel-rt should be built with -fwrapv [mrg-1]

491572 - CVE-2009-1072 kernel: nfsd should drop CAP_MKNOD for non-root

494275 - CVE-2009-1439 kernel: cifs: memory overwrite when saving nativeFileSystem field during mount

495472 - [broadcom10gb] daEth stress breaks bnx2x driver in MRG1.1

496031 - CVE-2009-1338 kernel: 'kill sig -1' must only apply to caller's pid namespace

497020 - CVE-2009-1192 kernel: agp: zero pages before sending to userspace

497047 - kernel: add some long-missing capabilities to fs_mask

499550 - kernel: proc: avoid information leaks to non-privileged processes [mrg-1]

499787 - kernel: random: make get_random_int() more random [mrg-1]

 

6. Package List:

 

MRG Realtime for RHEL 5 Server:

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/RHEMRG/SRPMS/kernel-rt-2.6.24.7-117.el5rt.src.rpm

 

i386:

kernel-rt-2.6.24.7-117.el5rt.i686.rpm

kernel-rt-debug-2.6.24.7-117.el5rt.i686.rpm

kernel-rt-debug-debuginfo-2.6.24.7-117.el5rt.i686.rpm

kernel-rt-debug-devel-2.6.24.7-117.el5rt.i686.rpm

kernel-rt-debuginfo-2.6.24.7-117.el5rt.i686.rpm

kernel-rt-debuginfo-common-2.6.24.7-117.el5rt.i686.rpm

kernel-rt-devel-2.6.24.7-117.el5rt.i686.rpm

kernel-rt-trace-2.6.24.7-117.el5rt.i686.rpm

kernel-rt-trace-debuginfo-2.6.24.7-117.el5rt.i686.rpm

kernel-rt-trace-devel-2.6.24.7-117.el5rt.i686.rpm

kernel-rt-vanilla-2.6.24.7-117.el5rt.i686.rpm

kernel-rt-vanilla-debuginfo-2.6.24.7-117.el5rt.i686.rpm

kernel-rt-vanilla-devel-2.6.24.7-117.el5rt.i686.rpm

 

noarch:

kernel-rt-doc-2.6.24.7-117.el5rt.noarch.rpm

 

x86_64:

kernel-rt-2.6.24.7-117.el5rt.x86_64.rpm

kernel-rt-debug-2.6.24.7-117.el5rt.x86_64.rpm

kernel-rt-debug-debuginfo-2.6.24.7-117.el5rt.x86_64.rpm

kernel-rt-debug-devel-2.6.24.7-117.el5rt.x86_64.rpm

kernel-rt-debuginfo-2.6.24.7-117.el5rt.x86_64.rpm

kernel-rt-debuginfo-common-2.6.24.7-117.el5rt.x86_64.rpm

kernel-rt-devel-2.6.24.7-117.el5rt.x86_64.rpm

kernel-rt-trace-2.6.24.7-117.el5rt.x86_64.rpm

kernel-rt-trace-debuginfo-2.6.24.7-117.el5rt.x86_64.rpm

kernel-rt-trace-devel-2.6.24.7-117.el5rt.x86_64.rpm

kernel-rt-vanilla-2.6.24.7-117.el5rt.x86_64.rpm

kernel-rt-vanilla-debuginfo-2.6.24.7-117.el5rt.x86_64.rpm

kernel-rt-vanilla-devel-2.6.24.7-117.el5rt.x86_64.rpm

 

These packages are GPG signed by Red Hat for security. Our key and

details on how to verify the signature are available from

https://www.redhat.com/security/team/key/#package

 

7. References:

 

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1072

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1192

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1338

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1439

http://www.redhat.com/security/updates/classification/#important

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://www.redhat.com/security/team/contact/

 

Copyright 2009 Red Hat, Inc.

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