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Vulnerability of Linux kernel: memory disclosure via ioctl_standard_iw_point

Synthesis of the vulnerability 

An attacker can use ioctl SIOCxxx in order to read kernel data.
Impacted products: Fedora, Linux, openSUSE, RHEL, SLES.
Severity of this bulletin: 1/4.
Creation date: 31/08/2010.
Références of this threat: BID-42885, CVE-2010-2955, FEDORA-2010-14235, openSUSE-SU-2010:0655-1, openSUSE-SU-2010:0664-1, openSUSE-SU-2010:0895-1, RHSA-2010:0771-01, RHSA-2010:0842-01, SUSE-SA:2010:044, SUSE-SA:2010:045, SUSE-SA:2010:046, SUSE-SA:2010:047, SUSE-SA:2010:054, SUSE-SA:2011:007, SUSE-SU-2011:0928-1, VIGILANCE-VUL-9891.

Description of the vulnerability 

The ioctl_standard_iw_point() function of the file net/wireless/wext-core.c handles IOCTL commands for the Wireless extensions driver. Each command can take in parameter an input / output buffer.

When handling an IOCTL command that returns data, the ioctl_standard_iw_point() function allocates a kernel space buffer to receive those data. The size of this buffer is passed in parameter of the function. The buffer is then integrally copied to the buffer passed in parameter. However, the ioctl_standard_iw_point() function does not properly check the size of the returned data. Therefore more data than necessary could be copied to the caller.

An attacker can therefore use SIOCxxx ioctl in order to read kernel data.
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This computer vulnerability alert impacts software or systems such as Fedora, Linux, openSUSE, RHEL, SLES.

Our Vigil@nce team determined that the severity of this computer threat alert is low.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this security vulnerability.

Solutions for this threat 

Linux kernel: patch for ioctl_standard_iw_point.
A patch is available in information sources.

Fedora 13: new kernel packages.
New packages are available:
  kernel-2.6.34.6-54.fc13

openSUSE 11.2: new kernel packages.
New packages are available:
  kernel-*-2.6.31.14-0.1.1

openSUSE 11.3: new kernel packages.
New packages are available:
  kernel-*-2.6.34.7-0.3.1

RHEL 5 MRG: new kernel-rt packages.
New packages are available:
MRG Realtime for RHEL 5 Server:
  kernel-rt-2.6.33.7-rt29.45.el5rt

RHEL 6: new kernel packages.
New packages are available:
  kernel-2.6.32-71.7.1.el6

SLE 10: new kernel packages.
New packages are available, as indicated in information sources.

SLE 11 GA: new kernel packages.
New packages are available:
SLE 11 SERVER Unsupported Extras (i586 ia64 ppc64 s390x x86_64):
  kernel-default-extra-2.6.27.54-0.2.1
SLE 11 SERVER Unsupported Extras (i586 x86_64):
  kernel-xen-extra-2.6.27.54-0.2.1
SLE 11 SERVER Unsupported Extras (ppc64):
  kernel-ppc64-extra-2.6.27.54-0.2.1
SLE 11 SERVER Unsupported Extras (i586):
  kernel-pae-extra-2.6.27.54-0.2.1

SLE 11 SP1: new kernel packages.
New packages are available, as indicated in information sources.

SUSE LE 9: new kernel packages (23/08/2011).
New packages are available:
http://download.novell.com/patch/finder/?keywords=c05dae2ea95bb787f18166cf12f585e3

SUSE LE RT 11: new kernel-rt packages.
New packages are available:
  SUSE Linux Enterprise Real Time 11 SP1
    http://download.novell.com/patch/finder/?keywords=956b7941659a9a350984b3e4fa8be427

SUSE: new kernel packages.
New packages are available, as indicated in information sources.
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