[Ksplice][Virtuozzo 4 Updates] New updates available via Ksplice (CU-2.6.18-028stab085.3)

[Tim Abbott]

Synopsis: CU-2.6.18-028stab085.3 can now be patched using Ksplice
CVEs: CVE-2010-3296 CVE-2010-3432 CVE-2010-3442 CVE-2010-3699 CVE-2010-3858 CVE-2010-3859 CVE-2010-3865 CVE-2010-3876 CVE-2010-3877 CVE-2010-3880 CVE-2010-4072 CVE-2010-4073 CVE-2010-4075 CVE-2010-4080 CVE-2010-4081 CVE-2010-4083 CVE-2010-4157 CVE-2010-4158 CVE-2010-4161 CVE-2010-4238 CVE-2010-4242 CVE-2010-4243 CVE-2010-4249 CVE-2010-4258 CVE-2010-4526 CVE-2010-4655
Red Hat Security Advisory Severity: Important

Systems running Virtuozzo 4.0 can now use Ksplice to patch against the 
latest Parallels Virtuozzo Containers kernel security update, 
CU-2.6.18-028stab085.3.  

Please note that while the 2.6.18-028stab085.3 kernel was just released 
for Virtuozzo 4.0, these updates have been available for Virtuozzo 4.6 and 
OpenVZ 4 for several weeks, and so no action is required on those 
platforms.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack on Virtuozzo 4 install 
these updates.  You can install these updates by running:

# /usr/sbin/uptrack-upgrade -y

On systems that have "autoinstall = yes" in /etc/uptrack/uptrack.conf, 
these updates will be installed automatically and you do not need to take 
any additional action.


DESCRIPTION

* Add support for ptracing processes in containers from the hardware node.


* Broken path MTU discovery over IPv6.

Clients on a network with a low MTU could not successfully connect over 
IPv6 to servers running in a VE.


* CVE-2010-3432: Remote denial of service vulnerability in SCTP.

The sctp_outq_flush() function can call sctp_packet_reset() on a packet 
structure that has already been filled with chunks.  This resets the 
packet length but does not remove the chunks from the list; the SCTP code 
then re-initializes the packet, which because of the incorrect length 
could overflow the skb, resulting in a kernel panic.


* CVE-2010-3442: Heap corruption vulnerability in ALSA core.

The snd_ctl_new() function allocates space for a snd_kcontrol struct by 
performing arithmetic operations on a user-provided size without checking 
for integer overflow.  This allows an unprivileged user to write an 
arbitrary value repeatedly past the bounds of this chunk, resulting in 
heap corruption.


* CVE-2010-3865: Integer overflow in RDS rdma page counting.

An integer overflow flaw was found in the Linux kernel's Reliable Datagram 
Sockets (RDS) protocol implementation.  A local, unprivileged user could 
use this flaw to cause a denial of service or escalate their privileges.


* CVE-2010-3876: Kernel information leak in packet subsystem.

The packet_getname_spkt function doesn't initiatilize all members of a 
sockaddr struct before copying it to userland, which allows unprivileged 
users to read uninitialized stack memory.


* CVE-2010-4083: Kernel information leak in semctl syscall.

The semctl system call allows unprivileged users to read uninitialized 
kernel stack memory, because various fields of a semid_ds struct declared 
on the stack are not altered or zeroed before being copied back to the 
user.


* CVE-2010-3699: Denial of service vulnerability in Xen block I/O driver.

A flaw was found in the Xenbus code for the unified block-device I/O 
interface back end.  A privileged guest user could use this flaw to cause 
a denial of service on the host system running the Xen hypervisor.  
(CVE-2010-3699, Moderate)


* CVE-2010-4242: NULL pointer dereference in Bluetooth HCI UART driver.

A NULL pointer dereference flaw was found in the Bluetooth HCI UART driver 
in the Linux kernel.  A local, unprivileged user could use this flaw to 
cause a denial of service. (CVE-2010-4242, Moderate).


* CVE-2010-4157: Memory corruption in Intel/ICP RAID driver.

An integer overflow in ioc_general() may cause the computation of an 
incorrect buffer size, leading to memory corruption.


* CVE-2010-3880: Logic error in INET_DIAG bytecode auditing.

The INET-DIAG subsystem is inconsistent about how it looks up the bytecode 
contained in a netlink message, making it possible for a user to cause the 
kernel to execute unaudited INET-DIAG bytecode. This can be abused to make 
the kernel enter an infinite loop, and possibly other consequences.


* CVE-2010-3858: Denial of service vulnerability with large argument lists.

Missing sanity checks were found in setup_arg_pages() in the Linux kernel.  
When making the size of the argument and environment area on the stack 
very large, it could trigger a BUG_ON(), resulting in a local denial of 
service. (CVE-2010-3858, Moderate).


* Mitigate denial of service attacks with large argument lists.

This update improves interactivity and makes SIGKILL more effective at 
responding to issues where an attacker could make a system unresponsive 
through various attacks involving processes with very large argument 
lists.


* CVE-2010-4161: Deadlock in socket queue subsystem.

The fix for Red Hat Bugzilla bug 484590 as provided in RHSA-2009:1243 
introduced a deadlock in the socket queue subsystem.  A local, 
unprivileged user could use this flaw to cause a denial of service. 
(CVE-2010-4161, Moderate)


* CVE-2010-3859: Heap overflow vulnerability in TIPC protocol.

A heap overflow flaw in the Linux kernel's Transparent Inter-Process 
Communication protocol (TIPC) implementation could allow a local, 
unprivileged user to escalate their privileges. (CVE-2010-3859, 
Important).


* CVE-2010-3296: Kernel information leak in cxgb driver.

The CHELSIO_GET_QSET_NUM device ioctl allows unprivileged users to read 4 
bytes of uninitialized stack memory, because the "addr" member of the 
ch_reg struct declared on the stack in cxgb_extension_ioctl() is not 
altered or zeroed before being copied back to the user.


* CVE-2010-3877: Kernel information leak in tipc driver.

The get_name function in net/tipc/socket.c did not properly initialize a 
certain structure, which allows local users to obtain potentially 
sensitive information from kernel stack memory by reading a copy of this 
structure.


* CVE-2010-4072: Kernel information leak in ipc shm subsystem.

Several functions in the System V IPC shared memory subsystem did not 
properly clear fields before copying data to user space, leaking data from 
uninitialized kernel stack memory to user space.


* CVE-2010-4073: Kernel information leaks in ipc compat subsystem.

Several functions in the System V IPC 32-bit compatability subsystem did 
not properly clear fields before copying data to user space, leaking data 
from uninitialized kernel stack memory to user space.


* Integer overflow in sys_remap_file_pages.

The remap_file_pages() system call in fremap.c has an integer overflow bug 
that is exploitable for denial of service and potentially other 
consequences.


* CVE-2010-4258: Failure to revert address limit override after oops.

If a kernel oops occurred with a kernel address limit override in place, 
the kernel did not properly reset the address limit before writing to a 
user-controlled address, potentially allowing a local user to escalate a 
denial-of-service attack into privilege escalation.


* CVE-2010-4075: Kernel information leak in serial core.

The TIOCGICOUNT device ioctl allows unprivileged users to read 
uninitialized stack memory, because the "reserved" member of the 
serial_icounter_struct struct declared on the stack is not altered or 
zeroed before being copied back to the user.


* CVE-2010-4080 and CVE-2010-4081: Information leaks in sound drivers.

The SNDRV_HDSP_IOCTL_GET_CONFIG_INFO and SNDRV_HDSP_IOCTL_GET_CONFIG_INFO 
ioctls in hdspm.c and hdsp.c allow unprivileged users to read 
uninitialized kernel stack memory, because several fields of the 
hdsp{m}_config_info structs declared on the stack are not altered or 
zeroed before being copied back to the user.


* CVE-2010-4238: Xen host crash with CDROM drives and Xen blkback driver.

A missing sanity check was found in vbd_create() in the Xen hypervisor 
implementation.  As CD-ROM drives are not supported by the blkback 
back-end driver, attempting to use a virtual CD-ROM drive with blkback 
could trigger a denial of service (crash) on the host system running the 
Xen hypervisor.  (CVE-2010-4238, Moderate)


* CVE-2010-4243: Denial of service due to wrong execve memory accounting.

A flaw was found in the Linux kernel execve() system call implementation.  
A local, unprivileged user could cause large amounts of memory to be 
allocated but not visible to the OOM (Out of Memory) killer, triggering a 
denial of service. (CVE-2010-4243, Moderate)


* CVE-2010-4158: Kernel information leak in socket filters.

The sk_run_filter function in the kernel's socket filter implementation 
did not properly clear an array on the kernel stack, resulting in 
uninitialized kernel stack memory being copied to user space.


* CVE-2010-4526: Remote denial of service vulnerability in SCTP.

A flaw was found in the sctp_icmp_proto_unreachable() function in the 
Linux kernel's Stream Control Transmission Protocol (SCTP) implementation.  
A remote attacker could use this flaw to cause a denial of service.  
(CVE-2010-4526, Important)


* CVE-2010-4655: Information leak in ethtool_get_regs.

A missing initialization flaw was found in the ethtool_get_regs() function 
in the Linux kernel's ethtool IOCTL handler. A local user who has the 
CAP_NET_ADMIN capability could use this flaw to cause an information leak. 
(CVE-2010-4655, Low).


* CVE-2010-4249: Local denial of service vulnerability in UNIX sockets.

A flaw was found in the Linux kernel's garbage collector for AF_UNIX 
sockets. A local, unprivileged user could use this flaw to trigger a 
denial of service (out-of-memory condition). (CVE-2010-4249, Moderate).


* Panic in kfree() due to race condition in acpi_bus_receive_event.

The acpi_bus_receive_event() function left the acpi_bus_event_list 
unlocked between checking it was empty and extracting its first element to 
pass to kfree().


* Fix connection timeouts due to shrinking tcp window with window scaling.

A problem with the IPV4 tcp window scaling code would, under certain 
circumstances, incorrectly shrink the TCP window in a way that could 
result in a constant flood of duplicate ACKs until the connection times 
out.

SUPPORT

Ksplice support is available at support at ksplice.com or +1 765-577-5423.