USN-1074-1: Linux kernel vulnerabilities

25 February 2011

Multiple kernel flaws.

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Al Viro discovered a race condition in the TTY driver. A local attacker
could exploit this to crash the system, leading to a denial of service.
(CVE-2009-4895)

Dan Rosenberg discovered that the MOVE_EXT ext4 ioctl did not correctly
check file permissions. A local attacker could overwrite append-only files,
leading to potential data loss. (CVE-2010-2066)

Dan Rosenberg discovered that the swapexit xfs ioctl did not correctly
check file permissions. A local attacker could exploit this to read from
write-only files, leading to a loss of privacy. (CVE-2010-2226)

Gael Delalleu, Rafal Wojtczuk, and Brad Spengler discovered that the memory
manager did not properly handle when applications grow stacks into adjacent
memory regions. A local attacker could exploit this to gain control of
certain applications, potentially leading to privilege escalation, as
demonstrated in attacks against the X server. (CVE-2010-2240)

Suresh Jayaraman discovered that CIFS did not correctly validate certain
response packats. A remote attacker could send specially crafted traffic
that would crash the system, leading to a denial of service.
(CVE-2010-2248)

Ben Hutchings discovered that the ethtool interface did not correctly check
certain sizes. A local attacker could perform malicious ioctl calls that
could crash the system, leading to a denial of service. (CVE-2010-2478,
CVE-2010-3084)

James Chapman discovered that L2TP did not correctly evaluate checksum
capabilities. If an attacker could make malicious routing changes, they
could crash the system, leading to a denial of service. (CVE-2010-2495)

Neil Brown discovered that NFSv4 did not correctly check certain write
requests. A remote attacker could send specially crafted traffic that could
crash the system or possibly gain root privileges. (CVE-2010-2521)

David Howells discovered that DNS resolution in CIFS could be spoofed. A
local attacker could exploit this to control DNS replies, leading to a loss
of privacy and possible privilege escalation. (CVE-2010-2524)

Dan Rosenberg discovered that the btrfs filesystem did not correctly
validate permissions when using the clone function. A local attacker could
overwrite the contents of file handles that were opened for append-only, or
potentially read arbitrary contents, leading to a loss of privacy. Only
Ubuntu 9.10 was affected. (CVE-2010-2538)

Bob Peterson discovered that GFS2 rename operations did not correctly
validate certain sizes. A local attacker could exploit this to crash the
system, leading to a denial of service. (CVE-2010-2798)

Kees Cook discovered that under certain situations the ioctl subsystem for
DRM did not properly sanitize its arguments. A local attacker could exploit
this to read previously freed kernel memory, leading to a loss of privacy.
(CVE-2010-2803)

Eric Dumazet discovered that many network functions could leak kernel stack
contents. A local attacker could exploit this to read portions of kernel
memory, leading to a loss of privacy. (CVE-2010-2942, CVE-2010-3477)

Dave Chinner discovered that the XFS filesystem did not correctly order
inode lookups when exported by NFS. A remote attacker could exploit this to
read or write disk blocks that had changed file assignment or had become
unlinked, leading to a loss of privacy. (CVE-2010-2943)

Sergey Vlasov discovered that JFS did not correctly handle certain extended
attributes. A local attacker could bypass namespace access rules, leading
to a loss of privacy. (CVE-2010-2946)

Tavis Ormandy discovered that the IRDA subsystem did not correctly shut
down. A local attacker could exploit this to cause the system to crash or
possibly gain root privileges. (CVE-2010-2954)

Brad Spengler discovered that the wireless extensions did not correctly
validate certain request sizes. A local attacker could exploit this to read
portions of kernel memory, leading to a loss of privacy. (CVE-2010-2955)

Ben Hawkes discovered an integer overflow in the Controller Area Network
(CVE-2010-2959)

Kees Cook discovered that the Intel i915 graphics driver did not correctly
validate memory regions. A local attacker with access to the video card
could read and write arbitrary kernel memory to gain root privileges.
Ubuntu 10.10 was not affected. (CVE-2010-2962)

Kees Cook discovered that the V4L1 32bit compat interface did not correctly
validate certain parameters. A local attacker on a 64bit system with access
to a video device could exploit this to gain root privileges.
(CVE-2010-2963)

Toshiyuki Okajima discovered that ext4 did not correctly check certain
parameters. A local attacker could exploit this to crash the system or
overwrite the last block of large files. (CVE-2010-3015)

Tavis Ormandy discovered that the AIO subsystem did not correctly validate
certain parameters. A local attacker could exploit this to crash the system
or possibly gain root privileges. (CVE-2010-3067)

Dan Rosenberg discovered that certain XFS ioctls leaked kernel stack
contents. A local attacker could exploit this to read portions of kernel
memory, leading to a loss of privacy. (CVE-2010-3078)

Robert Swiecki discovered that ftrace did not correctly handle mutexes. A
local attacker could exploit this to crash the kernel, leading to a denial
of service. (CVE-2010-3079)

Tavis Ormandy discovered that the OSS sequencer device did not correctly
shut down. A local attacker could exploit this to crash the system or
possibly gain root privileges. (CVE-2010-3080)

Ben Hawkes discovered that the Linux kernel did not correctly validate
memory ranges on 64bit kernels when allocating memory on behalf of 32bit
system calls. On a 64bit system, a local attacker could perform malicious
multicast getsockopt calls to gain root privileges. (CVE-2010-3081)

Dan Rosenberg discovered that several network ioctls did not clear kernel
memory correctly. A local user could exploit this to read kernel stack
memory, leading to a loss of privacy. (CVE-2010-3296, CVE-2010-3297,
CVE-2010-3298)

Ben Hawkes discovered that the Linux kernel did not correctly filter
registers on 64bit kernels when performing 32bit system calls. On a 64bit
system, a local attacker could manipulate 32bit system calls to gain root
privileges. (CVE-2010-3301)

Dan Rosenberg discovered that the ROSE driver did not correctly check
parameters. A local attacker with access to a ROSE network device could
exploit this to crash the system or possibly gain root privileges.
(CVE-2010-3310)

Thomas Dreibholz discovered that SCTP did not correctly handle appending
packet chunks. A remote attacker could send specially crafted traffic to
crash the system, leading to a denial of service. (CVE-2010-3432)

Dan Rosenberg discovered that the CD driver did not correctly check
parameters. A local attacker could exploit this to read arbitrary kernel
memory, leading to a loss of privacy. (CVE-2010-3437)

Dan Rosenberg discovered that the Sound subsystem did not correctly
validate parameters. A local attacker could exploit this to crash the
system, leading to a denial of service. (CVE-2010-3442)

Dan Jacobson discovered that ThinkPad video output was not correctly access
controlled. A local attacker could exploit this to hang the system, leading
to a denial of service. (CVE-2010-3448)

It was discovered that KVM did not correctly initialize certain CPU
registers. A local attacker could exploit this to crash the system, leading
to a denial of service. (CVE-2010-3698)

Dan Rosenberg discovered that SCTP did not correctly handle HMAC
calculations. A remote attacker could send specially crafted traffic that
would crash the system, leading to a denial of service. (CVE-2010-3705)

Nelson Elhage discovered several problems with the Acorn Econet protocol
driver. A local user could cause a denial of service via a NULL pointer
dereference, escalate privileges by overflowing the kernel stack, and
assign Econet addresses to arbitrary interfaces. (CVE-2010-3848,
CVE-2010-3849, CVE-2010-3850)

Brad Spengler discovered that stack memory for new a process was not
correctly calculated. A local attacker could exploit this to crash the
system, leading to a denial of service. (CVE-2010-3858)

Kees Cook discovered that the ethtool interface did not correctly clear
kernel memory. A local attacker could read kernel heap memory, leading to a
loss of privacy. (CVE-2010-3861)

Dan Rosenberg discovered that the RDS network protocol did not correctly
check certain parameters. A local attacker could exploit this gain root
privileges. (CVE-2010-3904)

Kees Cook and Vasiliy Kulikov discovered that the shm interface did not
clear kernel memory correctly. A local attacker could exploit this to read
kernel stack memory, leading to a loss of privacy. (CVE-2010-4072)

Dan Rosenberg discovered that IPC structures were not correctly initialized
on 64bit systems. A local attacker could exploit this to read kernel stack
memory, leading to a loss of privacy. (CVE-2010-4073)

Dan Rosenberg discovered that the USB subsystem did not correctly
initialize certian structures. A local attacker could exploit this to read
kernel stack memory, leading to a loss of privacy. (CVE-2010-4074)

Dan Rosenberg discovered that the SiS video driver did not correctly clear
kernel memory. A local attacker could exploit this to read kernel stack
memory, leading to a loss of privacy. (CVE-2010-4078)

Dan Rosenberg discovered that the ivtv V4L driver did not correctly
initialize certian structures. A local attacker could exploit this to read
kernel stack memory, leading to a loss of privacy. (CVE-2010-4079)

Steve Chen discovered that setsockopt did not correctly check MSS values. A
local attacker could make a specially crafted socket call to crash the
system, leading to a denial of service. (CVE-2010-4165)

Dave Jones discovered that the mprotect system call did not correctly
handle merged VMAs. A local attacker could exploit this to crash the
system, leading to a denial of service. (CVE-2010-4169)

Vegard Nossum discovered that memory garbage collection was not handled
correctly for active sockets. A local attacker could exploit this to
allocate all available kernel memory, leading to a denial of service.
(CVE-2010-4249)

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Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 9.10

After a standard system update you need to reboot your computer to make
all the necessary changes.

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