Date:         Wed, 4 Nov 2009 15:34:08 -0600
Reply-To:     Troy Dawson 
Sender:       Security Errata for Scientific Linux
              
From:         Troy Dawson 
Subject:      Security ERRATA Important: kernel on SL3.x i386/x86_64
Comments: To: "scientific-linux-errata@fnal.gov"
          

Synopsis:	Important: kernel security and bug fix update
Issue date:	2009-11-03
CVE Names:	CVE-2008-5029 CVE-2008-5300 CVE-2009-1337
                   CVE-2009-1385 CVE-2009-1895 CVE-2009-2848
                   CVE-2009-3002 CVE-2009-3547

CVE-2008-5029 kernel: Unix sockets kernel panic
CVE-2008-5300 kernel: fix soft lockups/OOM issues with unix socket 
garbage collector
CVE-2009-1337 kernel: exit_notify: kill the wrong capable(CAP_KILL) check
CVE-2009-1385 kernel: e1000_clean_rx_irq() denial of service
CVE-2009-1895 kernel: personality: fix PER_CLEAR_ON_SETID
CVE-2009-2848 kernel: execve: must clear current->clear_child_tid
CVE-2009-3001, CVE-2009-3002 kernel: numerous getname() infoleaks
520300 - kernel: ipv4: make ip_append_data() handle NULL routing table 
[rhel-3]
CVE-2009-3547 kernel: fs: pipe.c null pointer dereference

Security fixes:

* when fput() was called to close a socket, the __scm_destroy() function 
in the Linux kernel could make indirect recursive calls to itself. This 
could,potentially, lead to a denial of service issue. (CVE-2008-5029, 
Important)

* the sendmsg() function in the Linux kernel did not block during UNIX
socket garbage collection. This could, potentially, lead to a local 
denial of service. (CVE-2008-5300, Important)

* the exit_notify() function in the Linux kernel did not properly reset 
the exit signal if a process executed a set user ID (setuid) application 
before exiting. This could allow a local, unprivileged user to elevate 
their privileges. (CVE-2009-1337, Important)

* a flaw was found in the Intel PRO/1000 network driver in the Linux
kernel. Frames with sizes near the MTU of an interface may be split 
across multiple hardware receive descriptors. Receipt of such a frame 
could leak through a validation check, leading to a corruption of the 
length check. A remote attacker could use this flaw to send a 
specially-crafted packet that would cause a denial of service or code 
execution. (CVE-2009-1385, Important)

* 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)

* it was discovered that, when executing a new process, the 
clear_child_tid pointer in the Linux kernel is not cleared. If this 
pointer points to a writable portion of the memory of the new program, 
the kernel could corrupt four bytes of memory, possibly leading to a 
local denial of service or privilege escalation. (CVE-2009-2848, Important)

* missing initialization flaws were found in getname() implementations 
in the IrDA sockets, AppleTalk DDP protocol, NET/ROM protocol, and ROSE
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)

Bug fixes:

* this update adds the mmap_min_addr tunable and restriction checks to 
help prevent unprivileged users from creating new memory mappings below 
the minimum address. This can help prevent the exploitation of NULL 
pointer dereference bugs. Note that mmap_min_addr is set to zero 
(disabled) by default for backwards compatibility. (BZ#512642)

* a bridge reference count problem in IPv6 has been fixed. (BZ#457010)

* enforce null-termination of user-supplied arguments to setsockopt().
(BZ#505514)

* the gcc flag "-fno-delete-null-pointer-checks" was added to the kernel
build options. This prevents gcc from optimizing out NULL pointer checks
after the first use of a pointer. NULL pointer bugs are often exploited 
by attackers. Keeping these checks is a safety measure. (BZ#511185)

* 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#520300)

The system must be rebooted for this update to take effect.

SL 3.0.x

      SRPMS:
kernel-2.4.21-63.EL.src.rpm
      i386:
kernel-2.4.21-63.EL.athlon.rpm
kernel-2.4.21-63.EL.i686.rpm
kernel-BOOT-2.4.21-63.EL.i386.rpm
kernel-doc-2.4.21-63.EL.i386.rpm
kernel-hugemem-2.4.21-63.EL.i686.rpm
kernel-hugemem-unsupported-2.4.21-63.EL.i686.rpm
kernel-smp-2.4.21-63.EL.athlon.rpm
kernel-smp-2.4.21-63.EL.i686.rpm
kernel-smp-unsupported-2.4.21-63.EL.athlon.rpm
kernel-smp-unsupported-2.4.21-63.EL.i686.rpm
kernel-source-2.4.21-63.EL.i386.rpm
kernel-unsupported-2.4.21-63.EL.athlon.rpm
kernel-unsupported-2.4.21-63.EL.i686.rpm
   Dependencies:
kernel-module-openafs-2.4.21-63.EL-1.2.13-15.18.SL.athlon.rpm
kernel-module-openafs-2.4.21-63.EL-1.2.13-15.18.SL.i686.rpm
kernel-module-openafs-2.4.21-63.ELsmp-1.2.13-15.18.SL.athlon.rpm
kernel-module-openafs-2.4.21-63.ELsmp-1.2.13-15.18.SL.i686.rpm

      x86_64:
kernel-2.4.21-63.EL.ia32e.rpm
kernel-2.4.21-63.EL.x86_64.rpm
kernel-doc-2.4.21-63.EL.x86_64.rpm
kernel-smp-2.4.21-63.EL.x86_64.rpm
kernel-smp-unsupported-2.4.21-63.EL.x86_64.rpm
kernel-source-2.4.21-63.EL.x86_64.rpm
kernel-unsupported-2.4.21-63.EL.ia32e.rpm
kernel-unsupported-2.4.21-63.EL.x86_64.rpm
   Dependencies:
kernel-module-openafs-2.4.21-63.EL-1.2.13-15.18.SL.ia32e.rpm
kernel-module-openafs-2.4.21-63.EL-1.2.13-15.18.SL.x86_64.rpm
kernel-module-openafs-2.4.21-63.ELsmp-1.2.13-15.18.SL.x86_64.rpm

-Connie Sieh
-Troy Dawson