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Category:   Application (Generic)  >   Glibc Vendors:   GNU [multiple authors]
(Red Hat Issues Fix) Glibc getaddrinfo() Stack Overflow Lets Remote or Local Users Execute Arbitrary Code
SecurityTracker Alert ID:  1035027
SecurityTracker URL:  http://securitytracker.com/id/1035027
CVE Reference:   CVE-2015-7547   (Links to External Site)
Date:  Feb 17 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.

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:

https://googleonlinesecurity.blogspot.com/2016/02/cve-2015-7547-glibc-getaddrinfo-stack.html


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

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-0175.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-0175.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

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-2016:0175-01] Critical: glibc security and bug fix update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Critical: glibc security and bug fix update
Advisory ID:       RHSA-2016:0175-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-0175.html
Issue date:        2016-02-16
CVE Names:         CVE-2015-7547 
=====================================================================

1. Summary:

Updated glibc packages that fix one security issue and two bugs are now
available for Red Hat Enterprise Linux 6.

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:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

The glibc packages provide the standard C libraries (libc), POSIX thread
libraries (libpthread), standard math libraries (libm), and the Name
Server Caching Daemon (nscd) used by multiple programs on the system.
Without these libraries, the Linux system cannot function correctly.

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.

This update also fixes the following bugs:

* The dynamic loader has been enhanced to allow the loading of more shared
libraries that make use of static thread local storage. While static thread
local storage is the fastest access mechanism it may also prevent the
shared library from being loaded at all since the static storage space is a
limited and shared process-global resource. Applications which would
previously fail with "dlopen: cannot load any more object with static TLS"
should now start up correctly. (BZ#1291270)

* A bug in the POSIX realtime support would cause asynchronous I/O or
certain timer API calls to fail and return errors in the presence of large
thread-local storage data that exceeded PTHREAD_STACK_MIN in size
(generally 16 KiB). The bug in librt has been corrected and the impacted
APIs no longer return errors when large thread-local storage data is
present in the application. (BZ#1301625)

All glibc users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues.

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:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

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

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
glibc-2.12-1.166.el6_7.7.src.rpm

i386:
glibc-2.12-1.166.el6_7.7.i686.rpm
glibc-common-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-devel-2.12-1.166.el6_7.7.i686.rpm
glibc-headers-2.12-1.166.el6_7.7.i686.rpm
glibc-utils-2.12-1.166.el6_7.7.i686.rpm
nscd-2.12-1.166.el6_7.7.i686.rpm

x86_64:
glibc-2.12-1.166.el6_7.7.i686.rpm
glibc-2.12-1.166.el6_7.7.x86_64.rpm
glibc-common-2.12-1.166.el6_7.7.x86_64.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.x86_64.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.x86_64.rpm
glibc-devel-2.12-1.166.el6_7.7.i686.rpm
glibc-devel-2.12-1.166.el6_7.7.x86_64.rpm
glibc-headers-2.12-1.166.el6_7.7.x86_64.rpm
glibc-utils-2.12-1.166.el6_7.7.x86_64.rpm
nscd-2.12-1.166.el6_7.7.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-static-2.12-1.166.el6_7.7.i686.rpm

x86_64:
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.x86_64.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.x86_64.rpm
glibc-static-2.12-1.166.el6_7.7.i686.rpm
glibc-static-2.12-1.166.el6_7.7.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
glibc-2.12-1.166.el6_7.7.src.rpm

x86_64:
glibc-2.12-1.166.el6_7.7.i686.rpm
glibc-2.12-1.166.el6_7.7.x86_64.rpm
glibc-common-2.12-1.166.el6_7.7.x86_64.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.x86_64.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.x86_64.rpm
glibc-devel-2.12-1.166.el6_7.7.i686.rpm
glibc-devel-2.12-1.166.el6_7.7.x86_64.rpm
glibc-headers-2.12-1.166.el6_7.7.x86_64.rpm
glibc-utils-2.12-1.166.el6_7.7.x86_64.rpm
nscd-2.12-1.166.el6_7.7.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

x86_64:
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.x86_64.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.x86_64.rpm
glibc-static-2.12-1.166.el6_7.7.i686.rpm
glibc-static-2.12-1.166.el6_7.7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
glibc-2.12-1.166.el6_7.7.src.rpm

i386:
glibc-2.12-1.166.el6_7.7.i686.rpm
glibc-common-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-devel-2.12-1.166.el6_7.7.i686.rpm
glibc-headers-2.12-1.166.el6_7.7.i686.rpm
glibc-utils-2.12-1.166.el6_7.7.i686.rpm
nscd-2.12-1.166.el6_7.7.i686.rpm

ppc64:
glibc-2.12-1.166.el6_7.7.ppc.rpm
glibc-2.12-1.166.el6_7.7.ppc64.rpm
glibc-common-2.12-1.166.el6_7.7.ppc64.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.ppc.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.ppc64.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.ppc.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.ppc64.rpm
glibc-devel-2.12-1.166.el6_7.7.ppc.rpm
glibc-devel-2.12-1.166.el6_7.7.ppc64.rpm
glibc-headers-2.12-1.166.el6_7.7.ppc64.rpm
glibc-utils-2.12-1.166.el6_7.7.ppc64.rpm
nscd-2.12-1.166.el6_7.7.ppc64.rpm

s390x:
glibc-2.12-1.166.el6_7.7.s390.rpm
glibc-2.12-1.166.el6_7.7.s390x.rpm
glibc-common-2.12-1.166.el6_7.7.s390x.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.s390.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.s390x.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.s390.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.s390x.rpm
glibc-devel-2.12-1.166.el6_7.7.s390.rpm
glibc-devel-2.12-1.166.el6_7.7.s390x.rpm
glibc-headers-2.12-1.166.el6_7.7.s390x.rpm
glibc-utils-2.12-1.166.el6_7.7.s390x.rpm
nscd-2.12-1.166.el6_7.7.s390x.rpm

x86_64:
glibc-2.12-1.166.el6_7.7.i686.rpm
glibc-2.12-1.166.el6_7.7.x86_64.rpm
glibc-common-2.12-1.166.el6_7.7.x86_64.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.x86_64.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.x86_64.rpm
glibc-devel-2.12-1.166.el6_7.7.i686.rpm
glibc-devel-2.12-1.166.el6_7.7.x86_64.rpm
glibc-headers-2.12-1.166.el6_7.7.x86_64.rpm
glibc-utils-2.12-1.166.el6_7.7.x86_64.rpm
nscd-2.12-1.166.el6_7.7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386:
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-static-2.12-1.166.el6_7.7.i686.rpm

ppc64:
glibc-debuginfo-2.12-1.166.el6_7.7.ppc.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.ppc64.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.ppc.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.ppc64.rpm
glibc-static-2.12-1.166.el6_7.7.ppc.rpm
glibc-static-2.12-1.166.el6_7.7.ppc64.rpm

s390x:
glibc-debuginfo-2.12-1.166.el6_7.7.s390.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.s390x.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.s390.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.s390x.rpm
glibc-static-2.12-1.166.el6_7.7.s390.rpm
glibc-static-2.12-1.166.el6_7.7.s390x.rpm

x86_64:
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.x86_64.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.x86_64.rpm
glibc-static-2.12-1.166.el6_7.7.i686.rpm
glibc-static-2.12-1.166.el6_7.7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
glibc-2.12-1.166.el6_7.7.src.rpm

i386:
glibc-2.12-1.166.el6_7.7.i686.rpm
glibc-common-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-devel-2.12-1.166.el6_7.7.i686.rpm
glibc-headers-2.12-1.166.el6_7.7.i686.rpm
glibc-utils-2.12-1.166.el6_7.7.i686.rpm
nscd-2.12-1.166.el6_7.7.i686.rpm

x86_64:
glibc-2.12-1.166.el6_7.7.i686.rpm
glibc-2.12-1.166.el6_7.7.x86_64.rpm
glibc-common-2.12-1.166.el6_7.7.x86_64.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.x86_64.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.x86_64.rpm
glibc-devel-2.12-1.166.el6_7.7.i686.rpm
glibc-devel-2.12-1.166.el6_7.7.x86_64.rpm
glibc-headers-2.12-1.166.el6_7.7.x86_64.rpm
glibc-utils-2.12-1.166.el6_7.7.x86_64.rpm
nscd-2.12-1.166.el6_7.7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386:
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-static-2.12-1.166.el6_7.7.i686.rpm

x86_64:
glibc-debuginfo-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-2.12-1.166.el6_7.7.x86_64.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.i686.rpm
glibc-debuginfo-common-2.12-1.166.el6_7.7.x86_64.rpm
glibc-static-2.12-1.166.el6_7.7.i686.rpm
glibc-static-2.12-1.166.el6_7.7.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-7547
https://access.redhat.com/security/updates/classification/#critical
https://access.redhat.com/articles/2161461

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2016 Red Hat, Inc.
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