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Category:   Application (Generic)  >   Red Hat Enterprise Virtualization Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Enterprise Virtualization) Glibc getaddrinfo() Stack Overflow Lets Remote or Local Users Execute Arbitrary Code
SecurityTracker Alert ID:  1035064
SecurityTracker URL:
CVE Reference:   CVE-2015-7547   (Links to External Site)
Date:  Feb 20 2016
Impact:   Execution of arbitrary code via local system, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Glibc. A remote or local user can execute arbitrary code on the target system. Red Hat Enterprise Virtualization is affected.

A remote or local user can send specially crafted data to trigger a stack overflow in the getaddrinfo() function in the glibc DNS client resolver code ('resolv/nss_dns') and execute arbitrary code on the target system. The code will run with the privileges of the target application using the glibc library.

Various applications may be affected, including ssh, sudo, and curl.

Additional information is available at:

Impact:   A remote or local user can execute arbitrary code on the target system.
Solution:   Red Hat has issued a fix for Red Hat Enterprise Virtualization.

The Red Hat advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6, 7

Message History:   This archive entry is a follow-up to the message listed below.
Feb 16 2016 Glibc getaddrinfo() Stack Overflow Lets Remote or Local Users Execute Arbitrary Code

 Source Message Contents

Subject:  [RHSA-2016:0277-01] Critical: rhev-hypervisor security update

Hash: SHA1

                   Red Hat Security Advisory

Synopsis:          Critical: rhev-hypervisor security update
Advisory ID:       RHSA-2016:0277-01
Product:           Red Hat Enterprise Virtualization
Advisory URL:
Issue date:        2016-02-19
CVE Names:         CVE-2015-7547 

1. Summary:

Updated rhev-hypervisor packages that fix one security issue are now

Red Hat Product Security has rated this update as having Critical security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

2. Relevant releases/architectures:

RHEL 7-based RHEV-H - noarch
RHEV Hypervisor for RHEL-6 - noarch

3. Description:

The rhev-hypervisor 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
Virtualization Agent.

Note: Red Hat Enterprise Virtualization Hypervisor is only available for
the Intel 64 and AMD64 architectures with virtualization extensions.

A stack-based buffer overflow was found in the way the libresolv library
performed dual A/AAAA DNS queries. A remote attacker could create a
specially crafted DNS response which could cause libresolv to crash or,
potentially, execute code with the permissions of the user running the
library. Note: this issue is only exposed when libresolv is called from the
nss_dns NSS service module. (CVE-2015-7547)

This issue was discovered by the Google Security Team and Red Hat.

Users of Red Hat Enterprise Virtualization Hypervisor are advised to
upgrade to these updated packages.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

5. Bugs fixed (

1293532 - CVE-2015-7547 glibc: getaddrinfo stack-based buffer overflow

6. Package List:

RHEV Hypervisor for RHEL-6:



RHEL 7-based RHEV-H:



These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from

7. References:

8. Contact:

The Red Hat security contact is <>. More contact
details at

Copyright 2016 Red Hat, Inc.
Version: GnuPG v1


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