(Red Hat Issues Fix) Glibc FORTIFY_SOURCE Protection Mechanism Can By Bypassed
SecurityTracker Alert ID: 1026991|
SecurityTracker URL: http://securitytracker.com/id/1026991
(Links to External Site)
Date: Apr 30 2012
Execution of arbitrary code via local system, Execution of arbitrary code via network, User access via local system, User access via network|
Fix Available: Yes Vendor Confirmed: Yes |
A vulnerability was reported in Glibc. A remote or local user can bypass format string protection to execute arbitrary code.|
If a format string flaw exists in the target application, a remote or local user can trigger an integer overflow in the FORTIFY_SOURCE format string protection mechanism and bypass the protection ostensibly provided by the mechanism to exploit the format string flaw.
Captain Planet reported this vulnerability.
A remote or local user may be able to execute arbitrary code on the target system.|
Red Hat has issued a fix for Red Hat Enterprise Virtualization.|
The Red Hat advisory is available at:
Vendor URL: www.gnu.org/software/libc/ (Links to External Site)
Linux (Red Hat Enterprise)|
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Date: Mon, 30 Apr 2012 18:02:04 +0000|
Subject: [RHSA-2012:0531-01] Important: rhev-hypervisor6 security and bug fix update
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Red Hat Security Advisory
Synopsis: Important: rhev-hypervisor6 security and bug fix update
Advisory ID: RHSA-2012:0531-01
Product: Red Hat Enterprise Virtualization
Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0531.html
Issue date: 2012-04-30
CVE Names: CVE-2012-0864 CVE-2012-1569 CVE-2012-1573
An updated rhev-hypervisor6 package that fixes three security issues and
one bug is now available.
The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.
2. Relevant releases/architectures:
RHEV Hypervisor for RHEL-6 - noarch
The rhev-hypervisor6 package provides a Red Hat Enterprise Virtualization
Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor
is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. It includes
everything necessary to run and manage virtual machines: A subset of the
Red Hat Enterprise Linux operating environment and the Red Hat Enterprise
Note: Red Hat Enterprise Virtualization Hypervisor is only available for
the Intel 64 and AMD64 architectures with virtualization extensions.
A flaw was found in the way libtasn1 decoded DER data. An attacker could
create carefully-crafted DER encoded input (such as an X.509 certificate)
that, when parsed by an application that uses libtasn1 (such as
applications using GnuTLS), could cause the application to crash.
A flaw was found in the way GnuTLS decrypted malformed TLS records. This
could cause a TLS/SSL client or server to crash when processing a
specially-crafted TLS record from a remote TLS/SSL connection peer.
An integer overflow flaw was found in the implementation of the printf
functions family. This could allow an attacker to bypass FORTIFY_SOURCE
protections and execute arbitrary code using a format string flaw in an
application, even though these protections are expected to limit the
impact of such flaws to an application abort. (CVE-2012-0864)
Red Hat would like to thank Matthew Hall of Mu Dynamics for reporting
CVE-2012-1569 and CVE-2012-1573.
This updated package provides updated components that include fixes for
various security issues. These issues have no security impact on Red Hat
Enterprise Virtualization Hypervisor itself, however. The security fixes
included in this update address the following CVE numbers:
CVE-2011-4128 (gnutls issue)
CVE-2012-0879, CVE-2012-1090, and CVE-2012-1097 (kernel issues)
CVE-2012-0884 and CVE-2012-1165 (openssl issues)
CVE-2012-0060, CVE-2012-0061, and CVE-2012-0815 (rpm issues)
This update also fixes the following bug:
* The Hypervisor previously set the lro_disable option for the enic driver.
The driver does not support this option, as a result the Hypervisor did
not correctly detect and configure the network interfaces of a Cisco M81KR
adaptor, when present. The Hypervisor has been updated and no longer sets
the invalid option for this driver. (BZ#809463)
Users of Red Hat Enterprise Virtualization Hypervisor are advised to
upgrade to this updated package, which fixes these issues.
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
5. Bugs fixed (http://bugzilla.redhat.com/):
794766 - CVE-2012-0864 glibc: FORTIFY_SOURCE format string protection bypass via "nargs" integer overflow
804920 - CVE-2012-1569 libtasn1: DER decoding buffer overflow (GNUTLS-SA-2012-3, MU-201202-02)
805432 - CVE-2012-1573 gnutls: TLS record handling issue (GNUTLS-SA-2012-2, MU-201202-01)
6. Package List:
RHEV Hypervisor for RHEL-6:
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <firstname.lastname@example.org>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2012 Red Hat, Inc.
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