7.8 - RHSA-2009:1540

Problem Description:

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.

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.

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.

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/):

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