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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel Use-After-Free Flaw in tcp_v6_conn_request() Lets Remote Users Deny Service
SecurityTracker Alert ID:  1024023
SecurityTracker URL:  http://securitytracker.com/id/1024023
CVE Reference:   CVE-2010-1188   (Links to External Site)
Date:  May 25 2010
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): RHEL 5.3
Description:   A vulnerability was reported in the Linux Kernel. A remote user can cause denial of service conditions in certain cases.

A remote user can a send specially crafted IPv6 packet to trigger a use-after-free memory error in tcp_v6_conn_request() and cause a kernel panic if the system has the IPV6_RECVPKTINFO option set on a listening socket.

Systems using IPv6 may be affected.

Masayuki Nakagawa reported this vulnerability.

[Editor's note: This vulnerability was originally reported in 2007.]
Impact:   A remote user can cause a kernel panic on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2010-0439.html
Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  

Message History:   This archive entry is a follow-up to the message listed below.
May 19 2010 Linux Kernel Use-After-Free Flaw in tcp_v6_conn_request() Lets Remote Users Deny Service


 Source Message Contents
Date:  Tue, 25 May 2010 12:06:47 -0400
Subject:  [RHSA-2010:0439-01] Important: kernel security and bug fix update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2010:0439-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0439.html
Issue date:        2010-05-25
CVE Names:         CVE-2010-1188 
=====================================================================

1. Summary:

Updated kernel packages that fix one security issue and two bugs are now
available for Red Hat Enterprise Linux 5.3 Extended Update Support.

The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from the
CVE link in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5.3.z server) - i386, ia64, noarch, ppc, s390x, x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issue:

* a use-after-free flaw was found in the tcp_rcv_state_process() function
in the Linux kernel TCP/IP protocol suite implementation. If a system using
IPv6 had the IPV6_RECVPKTINFO option set on a listening socket, a remote
attacker could send an IPv6 packet to that system, causing a kernel panic
(denial of service). (CVE-2010-1188, Important)

This update also fixes the following bugs:

* a memory leak occurred when reading files on an NFS file system that was
mounted with the "noac" option, causing memory to slowly be consumed.
Unmounting the file system did not free the memory. With this update, the
memory is correctly freed, which resolves this issue. (BZ#588221)

* the RHSA-2009:0225 update fixed a bug where, in some cases, on systems
with the kdump service enabled, pressing Alt+SysRq+C to trigger a crash
resulted in a system hang; therefore, the system did not restart and boot
the dump-capture kernel as expected; no vmcore file was logged; and the
following message was displayed on the console:

BUG: warning at arch/[arch]/kernel/crash.c:[xxx]/nmi_shootdown_cpus() (Not
tainted)

The RHSA-2009:0225 update resolved this issue by not calling printk()
during a crash. It was later discovered that this fix did not resolve the
issue in all cases, since there was one condition where printk() was
still being called: at a warning condition inside the mdelay() call.

This update replaces mdelay() calls with udelay(), where such a warning
condition does not exist, which fully resolves this issue, allowing
Alt+SysRq+C to work as expected. (BZ#588211)

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the 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

To install kernel packages manually, use "rpm -ivh [package]". Do not
use "rpm -Uvh" as that will remove the running kernel binaries from
your system. You may use "rpm -e" to remove old kernels after
determining that the new kernel functions properly on your system.

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

577711 - CVE-2010-1188 kernel: ipv6: skb is unexpectedly freed
588211 - [RHEL5.3 GA] The kernel stalls before starting second kernel when pressing Alt+SysRq+c in graphical console [rhel-5.3.z]
588221 - memory leak when reading from files mounted with nfs mount option 'noac' [rhel-5.3.z]

6. Package List:

Red Hat Enterprise Linux (v. 5.3.z server):

Source:
kernel-2.6.18-128.17.1.el5.src.rpm

i386:
kernel-2.6.18-128.17.1.el5.i686.rpm
kernel-PAE-2.6.18-128.17.1.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-128.17.1.el5.i686.rpm
kernel-PAE-devel-2.6.18-128.17.1.el5.i686.rpm
kernel-debug-2.6.18-128.17.1.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-128.17.1.el5.i686.rpm
kernel-debug-devel-2.6.18-128.17.1.el5.i686.rpm
kernel-debuginfo-2.6.18-128.17.1.el5.i686.rpm
kernel-debuginfo-common-2.6.18-128.17.1.el5.i686.rpm
kernel-devel-2.6.18-128.17.1.el5.i686.rpm
kernel-headers-2.6.18-128.17.1.el5.i386.rpm
kernel-xen-2.6.18-128.17.1.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-128.17.1.el5.i686.rpm
kernel-xen-devel-2.6.18-128.17.1.el5.i686.rpm

ia64:
kernel-2.6.18-128.17.1.el5.ia64.rpm
kernel-debug-2.6.18-128.17.1.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-128.17.1.el5.ia64.rpm
kernel-debug-devel-2.6.18-128.17.1.el5.ia64.rpm
kernel-debuginfo-2.6.18-128.17.1.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-128.17.1.el5.ia64.rpm
kernel-devel-2.6.18-128.17.1.el5.ia64.rpm
kernel-headers-2.6.18-128.17.1.el5.ia64.rpm
kernel-xen-2.6.18-128.17.1.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-128.17.1.el5.ia64.rpm
kernel-xen-devel-2.6.18-128.17.1.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-128.17.1.el5.noarch.rpm

ppc:
kernel-2.6.18-128.17.1.el5.ppc64.rpm
kernel-debug-2.6.18-128.17.1.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-128.17.1.el5.ppc64.rpm
kernel-debug-devel-2.6.18-128.17.1.el5.ppc64.rpm
kernel-debuginfo-2.6.18-128.17.1.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-128.17.1.el5.ppc64.rpm
kernel-devel-2.6.18-128.17.1.el5.ppc64.rpm
kernel-headers-2.6.18-128.17.1.el5.ppc.rpm
kernel-headers-2.6.18-128.17.1.el5.ppc64.rpm
kernel-kdump-2.6.18-128.17.1.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-128.17.1.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-128.17.1.el5.ppc64.rpm

s390x:
kernel-2.6.18-128.17.1.el5.s390x.rpm
kernel-debug-2.6.18-128.17.1.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-128.17.1.el5.s390x.rpm
kernel-debug-devel-2.6.18-128.17.1.el5.s390x.rpm
kernel-debuginfo-2.6.18-128.17.1.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-128.17.1.el5.s390x.rpm
kernel-devel-2.6.18-128.17.1.el5.s390x.rpm
kernel-headers-2.6.18-128.17.1.el5.s390x.rpm
kernel-kdump-2.6.18-128.17.1.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-128.17.1.el5.s390x.rpm
kernel-kdump-devel-2.6.18-128.17.1.el5.s390x.rpm

x86_64:
kernel-2.6.18-128.17.1.el5.x86_64.rpm
kernel-debug-2.6.18-128.17.1.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-128.17.1.el5.x86_64.rpm
kernel-debug-devel-2.6.18-128.17.1.el5.x86_64.rpm
kernel-debuginfo-2.6.18-128.17.1.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-128.17.1.el5.x86_64.rpm
kernel-devel-2.6.18-128.17.1.el5.x86_64.rpm
kernel-headers-2.6.18-128.17.1.el5.x86_64.rpm
kernel-xen-2.6.18-128.17.1.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-128.17.1.el5.x86_64.rpm
kernel-xen-devel-2.6.18-128.17.1.el5.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:

https://www.redhat.com/security/data/cve/CVE-2010-1188.html
http://www.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2010 Red Hat, Inc.
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