RHSA-2009:1540 - Security Advisory

Topic

Updated kernel-rt packages that fix several security issues, multiple bugs,
and add enhancements are now available for Red Hat Enterprise MRG 1.1.

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

Description

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

Security fixes:

• the ADDR_COMPAT_LAYOUT and MMAP_PAGE_ZERO flags were not cleared when a

setuid or setgid program was executed. A local, unprivileged user could use
this flaw to bypass the mmap_min_addr protection mechanism and perform a
NULL pointer dereference attack, or bypass the Address Space Layout
Randomization (ASLR) security feature. (CVE-2009-1895, Important)

• 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)

• missing initialization flaws were found in getname() implementations in

numerous network protocol implementations in the Linux kernel. Certain
data structures in these getname() implementations were not initialized
properly before being copied to user-space. These flaws could lead to an
information leak. (CVE-2009-3002, 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)

• NULL pointer dereference flaws were found in the r128 driver in the

Linux kernel. Checks to test if the Concurrent Command Engine state was
initialized were missing in private IOCTL functions. An attacker could use
these flaws to cause a local denial of service or escalate their
privileges. (CVE-2009-3620, Important)

• Kees Cook and Steve Beattie discovered a race condition in the /proc

code in the Linux kernel. This could lead to information in the
"/proc/[pid]/maps" and "/proc/[pid]/smaps" files being leaked to users (who
would otherwise not have access to this information) during ELF loading.
This could help a local attacker bypass the ASLR security feature.
(CVE-2009-2691, Moderate)

• a NULL pointer dereference flaw was found in the md driver in the Linux

kernel. If the suspend_lo or suspend_hi file in "/sys/" is modified when
the disk array is inactive, it could lead to a local denial of service or
privilege escalation. By default, only root can write to these two files.
(CVE-2009-2849, Moderate)

• an information leak was found in the Linux kernel. On AMD64 systems,

32-bit processes could access and read certain 64-bit registers by
temporarily switching themselves to 64-bit mode. (CVE-2009-2910, Moderate)

• padding data in several core network structures was not initialized

properly before being sent to user-space, possibly leading to information
leaks. (CVE-2009-3228, CVE-2009-3612, Moderate)

• the unix_stream_connect() function in the Linux kernel did not check if a

UNIX domain socket was in the shutdown state. This could lead to a
deadlock. A local, unprivileged user could use this flaw to cause a denial
of service. (CVE-2009-3621, Moderate)

These updated packages also include bug fixes and enhancements. Users are
directed to the Realtime Security Update Release Notes for version 1.1 for
information on these changes, which will be available shortly from:

http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/

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

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

Affected Products

• MRG Realtime 1 x86_64
• MRG Realtime 1 i386

Fixes

• BZ - 511171 - CVE-2009-1895 kernel: personality: fix PER_CLEAR_ON_SETID
• BZ - 516171 - CVE-2009-2691 kernel: /proc/$pid/maps visible during initial setuid ELF loading
• BZ - 517830 - CVE-2009-2695 kernel: SELinux and mmap_min_addr
• BZ - 518132 - CVE-2009-2849 kernel: md: NULL pointer deref when accessing suspend_* sysfs attributes
• BZ - 518160 - [FOCUS] Boot hang with x3950 using MRG's -108 kernel
• BZ - 519305 - CVE-2009-3001, CVE-2009-3002 kernel: numerous getname() infoleaks
• BZ - 520990 - CVE-2009-3228 kernel: tc: uninitialised kernel memory leak
• BZ - 521999 - ip_tables: connlimit match: invalid size 32 != 24
• BZ - 522359 - MRG 1.1 SMI remeidation support for HS22 and Rackmounts
• BZ - 522501 - Turn off IPX protocol module
• BZ - 522503 - Turn off AppleTalk protocol module in realtime kernel
• BZ - 523986 - kernel: ipt_recent: sanity check hit count [mrg-1]
• BZ - 526788 - CVE-2009-2910 kernel: x86_64 32 bit process register leak
• BZ - 528139 - FTRACE: check for failure for all conversions, tracing: correct module boundaries for ftrace_release
• BZ - 528868 - CVE-2009-3612 kernel: tcf_fill_node() infoleak due to typo in 9ef1d4c7
• BZ - 529137 - CVE-2009-3613 kernel: flood ping cause out-of-iommu error and panic when mtu larger than 1500
• BZ - 529597 - CVE-2009-3620 kernel: r128 IOCTL NULL pointer dereferences when CCE state is uninitialised
• BZ - 529626 - CVE-2009-3621 kernel: AF_UNIX: Fix deadlock on connecting to shutdown socket
• BZ - 530490 - CVE-2009-3547 kernel: fs: pipe.c null pointer dereference

CVEs

• CVE-2009-3620
• CVE-2009-3621
• CVE-2009-3002
• CVE-2009-2691
• CVE-2009-3547
• CVE-2009-2695
• CVE-2009-2910
• CVE-2009-3613
• CVE-2009-3612
• CVE-2009-3228
• CVE-2009-2849
• CVE-2009-1895

References

• http://www.redhat.com/security/updates/classification/#important
• http://kbase.redhat.com/faq/docs/DOC-18042
• http://kbase.redhat.com/faq/docs/DOC-17866
• http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/