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Reference: CERT-EU Security Advisory 2013-0084

Title: Several Vulnerabilities in Linux kernel  [1]

Version history:
23.10.2013 Initial publication

Summary
=======
* It was found that the fix for CVE-2012-3552 released via RHSA-2012:1540
introduced an invalid free flaw in the Linux kernel's TCP/IP protocol suite
implementation. A local, unprivileged user could use this flaw to corrupt
kernel memory via crafted sendmsg() calls, allowing them to cause a denial
of service or, potentially, escalate their privileges on the
system. (CVE-2013-2224, Important) [2]

* An information leak flaw was found in the way Linux kernel's device
mapper subsystem, under certain conditions, interpreted data written to
snapshot block devices. An attacker could use this flaw to read data from
disk blocks in free space, which are normally inaccessible. (CVE-2013-4299,
Moderate) [3]

* A format string flaw was found in the b43_do_request_fw() function in the
Linux kernel's b43 driver implementation. A local user who is able to
specify the "fwpostfix" b43 module parameter could use this flaw to cause a
denial of service or, potentially, escalate their privileges.
(CVE-2013-2852, Low) [4]

Vulnerable systems
==================
Linux kernel

What can you do?
================
We recommend that you upgrade your python-crypto packages.

What to tell your users?
========================
N/A

More information
================
[1] https://rhn.redhat.com/errata/RHSA-2013-1450.html
[2] https://www.redhat.com/security/data/cve/CVE-2013-2224.html
[3] https://www.redhat.com/security/data/cve/CVE-2013-2852.html
[4] https://www.redhat.com/security/data/cve/CVE-2013-4299.html

Best regards,

CERT-EU Pre-configuration Team (http://cert.europa.eu)
Phone: +32.2.2990005 / e-mail: cert-eu@ec.europa.eu
PGP KeyID 0x46AC4383
FP: 9011 6BE9 D642 DD93 8348 DAFA 27A4 06CA 46AC 4383
Privacy Statement:
http://cert.europa.eu/cert/plainedition/en/cert_privacy.html

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