| Descripción: | Description:
The remote host is missing updates announced in
advisory RHSA-2010:0723.
The kernel packages contain the Linux kernel, the core of any Linux
operating system.
This update fixes the following security issues:
* A buffer overflow flaw was found in the ecryptfs_uid_hash() function in
the Linux kernel eCryptfs implementation. On systems that have the eCryptfs
netlink transport (Red Hat Enterprise Linux 5 does) or where the
/dev/ecryptfs file has world writable permissions (which it does not, by
default, on Red Hat Enterprise Linux 5), a local, unprivileged user could
use this flaw to cause a denial of service or possibly escalate their
privileges. (CVE-2010-2492, Important)
* A miscalculation of the size of the free space of the initial directory
entry in a directory leaf block was found in the Linux kernel Global File
System 2 (GFS2) implementation. A local, unprivileged user with write
access to a GFS2-mounted file system could perform a rename operation on
that file system to trigger a NULL pointer dereference, possibly resulting
in a denial of service or privilege escalation. (CVE-2010-2798, Important)
* A flaw was found in the Xen hypervisor implementation when running a
system that has an Intel CPU without Extended Page Tables (EPT) support.
While attempting to dump information about a crashing fully-virtualized
guest, the flaw could cause the hypervisor to crash the host as well. A
user with permissions to configure a fully-virtualized guest system could
use this flaw to crash the host. (CVE-2010-2938, Moderate)
* Information leak flaws were found in the Linux kernel's Traffic Control
Unit implementation. A local attacker could use these flaws to cause the
kernel to leak kernel memory to user-space, possibly leading to the
disclosure of sensitive information. (CVE-2010-2942, Moderate)
* A flaw was found in the Linux kernel's XFS file system implementation.
The file handle lookup could return an invalid inode as valid. If an XFS
file system was mounted via NFS (Network File System), a local attacker
could access stale data or overwrite existing data that reused the inodes.
(CVE-2010-2943, Moderate)
* An integer overflow flaw was found in the extent range checking code in
the Linux kernel's ext4 file system implementation. A local, unprivileged
user with write access to an ext4-mounted file system could trigger this
flaw by writing to a file at a very large file offset, resulting in a local
denial of service. (CVE-2010-3015, Moderate)
* An information leak flaw was found in the Linux kernel's USB
implementation. Certain USB errors could result in an uninitialized kernel
buffer being sent to user-space. An attacker with physical access to a
target system could use this flaw to cause an information leak.
(CVE-2010-1083, Low)
Red Hat would like to thank Andre Osterhues for reporting CVE-2010-2492
Grant Diffey of CenITex for reporting CVE-2010-2798
Toshiyuki Okajima for
reporting CVE-2010-3015
and Marcus Meissner for reporting CVE-2010-1083.
This update also fixes several bugs. Documentation for these bug fixes will
be available shortly from the Technical Notes document linked to in the
References.
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.
Solution:
Please note that this update is available via
Red Hat Network. To use Red Hat Network, launch the Red
Hat Update Agent with the following command: up2date
http://rhn.redhat.com/errata/RHSA-2010-0723.html
http://www.redhat.com/security/updates/classification/#important
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.5_Technical_Notes/kernel.html#id3512212
Risk factor : High
CVSS Score:
7.9
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