U radu jezgre operacijskog sustava Linux uočeno je više sigurnosnih ranjivosti koje napadač može iskoristiti za otkrivanje osjetljivih podataka, zaobilaženje ograničenja u sustavu te za napad uskraćivanja usluga (eng. Denial of Service).
Paket:
Linux kernel 2.6.x
Operacijski sustavi:
Ubuntu Linux 8.04
Kritičnost:
5.1
Problem:
cjelobrojno prepisivanje, pogreška u programskoj funkciji, pogreška u programskoj komponenti, preljev međuspremnika
Sigurnosne ranjivosti su posljedica pogrešaka u implementaciji jezgre operacijskog sustava Linux. Te pogreške su primjerice preljev međuspremnika u funkciji "mac_partition", pogrešna inicijalizacija nekih struktura u komponenti "ipc", cjelobrojno prepisivanje u funkciji "ib_uverbs_poll_cq", itd.
Posljedica:
Zloćudni korisnik navedene sigurnosne ranjivosti može iskoristiti za DoS (eng. Denial of Service) napad, otkrivanje osjetljivih informacija te zaobilaženje postavljenih ograničenja.
Rješenje:
Svim se korisnicima operacijskog sustava Linux, u svrhu zaštite sigurnosti, savjetuje njegova nadogradnja na novije inačice.
==========================================================================
Ubuntu Security Notice USN-1186-1
August 09, 2011
linux vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 8.04 LTS
Summary:
Multiple kernel flaws have been fixed.
Software Description:
- linux: Linux kernel
Details:
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)
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)
Vladymyr Denysov discovered that Xen virtual CD-ROM devices were not
handled correctly. A local attacker in a guest could make crafted blkback
requests that would crash the host, leading to a denial of service.
(CVE-2010-4238)
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)
Dan Carpenter discovered that the Infiniband driver did not correctly
handle certain requests. A local user could exploit this to crash the
system or potentially gain root privileges. (CVE-2010-4649, CVE-2011-1044)
Dan Rosenberg discovered that XFS did not correctly initialize memory. A
local attacker could make crafted ioctl calls to leak portions of kernel
stack memory, leading to a loss of privacy. (CVE-2011-0711)
Timo Warns discovered that MAC partition parsing routines did not correctly
calculate block counts. A local attacker with physical access could plug in
a specially crafted block device to crash the system or potentially gain
root privileges. (CVE-2011-1010)
Neil Horman discovered that NFSv4 did not correctly handle certain orders
of operation with ACL data. A remote attacker with access to an NFSv4 mount
could exploit this to crash the system, leading to a denial of service.
(CVE-2011-1090)
Vasiliy Kulikov discovered that the netfilter code did not check certain
strings copied from userspace. A local attacker with netfilter access could
exploit this to read kernel memory or crash the system, leading to a denial
of service. (CVE-2011-1170, CVE-2011-1171, CVE-2011-1172, CVE-2011-2534)
Vasiliy Kulikov discovered that the Acorn Universal Networking driver did
not correctly initialize memory. A remote attacker could send specially
crafted traffic to read kernel stack memory, leading to a loss of privacy.
(CVE-2011-1173)
Vasiliy Kulikov discovered that taskstats listeners were not correctly
handled. A local attacker could expoit this to exhaust memory and CPU
resources, leading to a denial of service. (CVE-2011-2484)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 8.04 LTS:
linux-image-2.6.24-29-386 2.6.24-29.92
linux-image-2.6.24-29-generic 2.6.24-29.92
linux-image-2.6.24-29-hppa32 2.6.24-29.92
linux-image-2.6.24-29-hppa64 2.6.24-29.92
linux-image-2.6.24-29-itanium 2.6.24-29.92
linux-image-2.6.24-29-lpia 2.6.24-29.92
linux-image-2.6.24-29-lpiacompat 2.6.24-29.92
linux-image-2.6.24-29-mckinley 2.6.24-29.92
linux-image-2.6.24-29-openvz 2.6.24-29.92
linux-image-2.6.24-29-powerpc 2.6.24-29.92
linux-image-2.6.24-29-powerpc-smp 2.6.24-29.92
linux-image-2.6.24-29-powerpc64-smp 2.6.24-29.92
linux-image-2.6.24-29-rt 2.6.24-29.92
linux-image-2.6.24-29-server 2.6.24-29.92
linux-image-2.6.24-29-sparc64 2.6.24-29.92
linux-image-2.6.24-29-sparc64-smp 2.6.24-29.92
linux-image-2.6.24-29-virtual 2.6.24-29.92
linux-image-2.6.24-29-xen 2.6.24-29.92
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1186-1
CVE-2010-4073, CVE-2010-4165, CVE-2010-4238, CVE-2010-4249,
CVE-2010-4649, CVE-2011-0711, CVE-2011-1010, CVE-2011-1044,
CVE-2011-1090, CVE-2011-1170, CVE-2011-1171, CVE-2011-1172,
CVE-2011-1173, CVE-2011-2484, CVE-2011-2534
Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.24-29.92
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