We will be scheduling an important kernel security, bug fixes and enhancement update this weekend.
This would take place as far as possible during the off-peak hours. A reboot is required to complete the upgrade. The downtime should not exceed 30 minutes and it will be minimize as much as possible.
This upgrade is scheduled as follows:
Date: 4 February 2012 (Saturday) to 6 February 2012 (Monday)
Time: Between 2AM and 8AM EST
Kernel security, bug fixes and enhancement update for all CentOS 5.x servers
Details of Kernel security, bug fixes and enhancement update
* A buffer overflow flaw was found in the way the Linux kernel's XFS file
system implementation handled links with overly long path names. A local,
unprivileged user could use this flaw to cause a denial of service or
escalate their privileges by mounting a specially-crafted disk.
(CVE-2011-4077, Important)
* The fix for CVE-2011-2482 provided by RHSA-2011:1212 introduced a
regression: on systems that do not have Security-Enhanced Linux (SELinux)
in Enforcing mode, a socket lock race could occur between sctp_rcv() and
sctp_accept(). A remote attacker could use this flaw to cause a denial of
service. By default, SELinux runs in Enforcing mode on Red Hat Enterprise
Linux 5. (CVE-2011-4348, Important)
* The proc file system could allow a local, unprivileged user to obtain
sensitive information or possibly cause integrity issues. (CVE-2011-1020,
Moderate)
* A missing validation flaw was found in the Linux kernel's m_stop()
implementation. A local, unprivileged user could use this flaw to trigger a
denial of service. (CVE-2011-3637, Moderate)
* A flaw was found in the Linux kernel's Journaling Block Device (JBD).
A local attacker could use this flaw to crash the system by mounting a
specially-crafted ext3 or ext4 disk. (CVE-2011-4132, Moderate)
* A flaw was found in the Linux kernel's encode_share_access()
implementation. A local, unprivileged user could use this flaw to trigger a
denial of service by creating a regular file on an NFSv4 (Network File
System version 4) file system via mknod(). (CVE-2011-4324, Moderate)
* A flaw was found in the Linux kernel's NFS implementation. A local,
unprivileged user could use this flaw to cause a denial of service.
(CVE-2011-4325, Moderate)
* A missing boundary check was found in the Linux kernel's HFS file system
implementation. A local attacker could use this flaw to cause a denial of
service or escalate their privileges by mounting a specially-crafted disk.
(CVE-2011-4330, Moderate)
system implementation handled links with overly long path names. A local,
unprivileged user could use this flaw to cause a denial of service or
escalate their privileges by mounting a specially-crafted disk.
(CVE-2011-4077, Important)
* The fix for CVE-2011-2482 provided by RHSA-2011:1212 introduced a
regression: on systems that do not have Security-Enhanced Linux (SELinux)
in Enforcing mode, a socket lock race could occur between sctp_rcv() and
sctp_accept(). A remote attacker could use this flaw to cause a denial of
service. By default, SELinux runs in Enforcing mode on Red Hat Enterprise
Linux 5. (CVE-2011-4348, Important)
* The proc file system could allow a local, unprivileged user to obtain
sensitive information or possibly cause integrity issues. (CVE-2011-1020,
Moderate)
* A missing validation flaw was found in the Linux kernel's m_stop()
implementation. A local, unprivileged user could use this flaw to trigger a
denial of service. (CVE-2011-3637, Moderate)
* A flaw was found in the Linux kernel's Journaling Block Device (JBD).
A local attacker could use this flaw to crash the system by mounting a
specially-crafted ext3 or ext4 disk. (CVE-2011-4132, Moderate)
* A flaw was found in the Linux kernel's encode_share_access()
implementation. A local, unprivileged user could use this flaw to trigger a
denial of service by creating a regular file on an NFSv4 (Network File
System version 4) file system via mknod(). (CVE-2011-4324, Moderate)
* A flaw was found in the Linux kernel's NFS implementation. A local,
unprivileged user could use this flaw to cause a denial of service.
(CVE-2011-4325, Moderate)
* A missing boundary check was found in the Linux kernel's HFS file system
implementation. A local attacker could use this flaw to cause a denial of
service or escalate their privileges by mounting a specially-crafted disk.
(CVE-2011-4330, Moderate)
יום שני, ינואר 30, 2012
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