RHEL 5 : kernel (RHSA-2009:1548)

This script is Copyright (C) 2009-2014 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated kernel packages that fix multiple security issues and several
bugs are now available for Red Hat Enterprise Linux 5.

This update has been rated as having important security impact by the
Red Hat Security Response Team.

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

Security fixes :

* a system with SELinux enforced was more permissive in allowing local
users in the unconfined_t domain to map low memory areas even if the
mmap_min_addr restriction was enabled. This could aid in the local
exploitation of NULL pointer dereference bugs. (CVE-2009-2695,
Important)

* a NULL pointer dereference flaw was found in the eCryptfs
implementation in the Linux kernel. A local attacker could use this
flaw to cause a local denial of service or escalate their privileges.
(CVE-2009-2908, Important)

* a flaw was found in the NFSv4 implementation. The kernel would do an
unnecessary permission check after creating a file. This check would
usually fail and leave the file with the permission bits set to random
values. Note: This is a server-side only issue. (CVE-2009-3286,
Important)

* a NULL pointer dereference flaw was found in each of the following
functions in the Linux kernel: pipe_read_open(), pipe_write_open(),
and pipe_rdwr_open(). When the mutex lock is not held, the i_pipe
pointer could be released by other processes before it is used to
update the pipe's reader and writer counters. This could lead to a
local denial of service or privilege escalation. (CVE-2009-3547,
Important)

* a flaw was found in the Realtek r8169 Ethernet driver in the Linux
kernel. pci_unmap_single() presented a memory leak that could lead to
IOMMU space exhaustion and a system crash. An attacker on the local
network could abuse this flaw by using jumbo frames for large amounts
of network traffic. (CVE-2009-3613, Important)

* missing initialization flaws were found in the Linux kernel. Padding
data in several core network structures was not initialized properly
before being sent to user-space. These flaws could lead to information
leaks. (CVE-2009-3228, Moderate)

Bug fixes :

* with network bonding in the 'balance-tlb' or 'balance-alb' mode, the
primary setting for the primary slave device was lost when said device
was brought down. Bringing the slave back up did not restore the
primary setting. (BZ#517971)

* some faulty serial device hardware caused systems running the
kernel-xen kernel to take a very long time to boot. (BZ#524153)

* a caching bug in nfs_readdir() may have caused NFS clients to see
duplicate files or not see all files in a directory. (BZ#526960)

* the RHSA-2009:1243 update removed the mpt_msi_enable option,
preventing certain scripts from running. This update adds the option
back. (BZ#526963)

* an iptables rule with the recent module and a hit count value
greater than the ip_pkt_list_tot parameter (the default is 20), did
not have any effect over packets, as the hit count could not be
reached. (BZ#527434)

* a check has been added to the IPv4 code to make sure that rt is not
NULL, to help prevent future bugs in functions that call
ip_append_data() from being exploitable. (BZ#527436)

* a kernel panic occurred in certain conditions after reconfiguring a
tape drive's block size. (BZ#528133)

* when using the Linux Virtual Server (LVS) in a master and backup
configuration, and propagating active connections on the master to the
backup, the connection timeout value on the backup was hard-coded to
180 seconds, meaning connection information on the backup was soon
lost. This could prevent the successful failover of connections. The
timeout value can now be set via 'ipvsadm --set'. (BZ#528645)

* a bug in nfs4_do_open_expired() could have caused the reclaimer
thread on an NFSv4 client to enter an infinite loop. (BZ#529162)

* MSI interrupts may not have been delivered for r8169 based network
cards that have MSI interrupts enabled. This bug only affected certain
systems. (BZ#529366)

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.

See also :

https://www.redhat.com/security/data/cve/CVE-2009-2695.html
https://www.redhat.com/security/data/cve/CVE-2009-2908.html
https://www.redhat.com/security/data/cve/CVE-2009-3228.html
https://www.redhat.com/security/data/cve/CVE-2009-3286.html
https://www.redhat.com/security/data/cve/CVE-2009-3547.html
https://www.redhat.com/security/data/cve/CVE-2009-3613.html
http://kbase.redhat.com/faq/docs/DOC-18042
http://rhn.redhat.com/errata/RHSA-2009-1548.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 6.4
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true