| Descripción: | Summary:
The remote host is missing an update for the 'kernel'
package(s) announced via the referenced advisory.
Vulnerability Insight:
The kernel packages contain the Linux kernel, the core of any Linux
operating system.
This update fixes the following security issues:
* 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)
* Solar Designer reported a missing capability check in the z90crypt driver
in the Linux kernel. This missing check could allow a local user with an
effective user ID (euid) of 0 to bypass intended capability restrictions.
(CVE-2009-1883, Moderate)
* a flaw was found in the way the do_sigaltstack() function in the Linux
kernel copies the stack_t structure to user-space. On 64-bit machines, this
flaw could lead to a four-byte information leak. (CVE-2009-2847, Moderate)
This update also fixes the following bugs:
* 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#517964)
* the Emulex LPFC driver has been updated to version 8.0.16.47, which
fixes a memory leak that caused memory allocation failures and system
hangs. (BZ#513192)
* an error in the MPT Fusion driver makefile caused CSMI ioctls to not
work with Serial Attached SCSI devices. (BZ#516184)
* 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
deference bugs. Note that mmap_min_addr is set to zero (disabled) by
default for backwards compatibility. (BZ#517904)
* time-outs resulted in I/O errors being logged to '/var/log/messages' when
running 'mt erase' on tape drives using certain LSI MegaRAID SAS adapters,
preventing the command from completing. The megaraid_sas driver's timeout
value is now set to t ...
Description truncated, please see the referenced URL(s) for more information.
Affected Software/OS:
kernel on CentOS 4
Solution:
Please install the updated packages.
CVSS Score:
7.2
CVSS Vector:
AV:L/AC:L/Au:N/C:C/I:C/A:C
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