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GNU C Library (glibc) __nss_hostname_digits_dots() function vulnerable to buffer overflow

Vulnerability Note VU#967332

Original Release Date: 2015-01-28 | Last Revised: 2015-10-22

Overview

The __nss_hostname_digits_dots() function of the GNU C Library (glibc) allows a buffer overflow condition in which arbitrary code may be executed. This vulnerability has been assigned CVE-2015-0235, and is referred to in the media by the name "GHOST".

Description

According to Qualys, the vulnerability is "a buffer overflow in the __nss_hostname_digits_dots() function of the GNU C Library (glibc). This bug is reachable both locally and remotely via the gethostbyname*() functions" and furthermore, "arbitrary code execution can be achieved" by use of the buffer overflow.

All versions of glibc from glibc-2.2 (released 2010-11-10) until glibc-2.17 are vulnerable. The vulnerability was patched on 2013-05-21, prior to the release of glibc-2.18.

For more details, please see the full Qualys Security Advisory.

Impact

The __nss_hostname_digits_dots() function allows a buffer overflow condition in which arbitrary code may be executed. The impact may vary depending on if the use case is local or remote.

Solution

Apply an update

Affected users may apply a patch or update to glibc-2.18 or later. The Vendor Status information below provides more information on updates.

Vendor Information

Some older, no longer supported versions of linux distributions may contain an older version of glibc that is vulnerable. Please check with your vendor to find out if you need to upgrade to a newer operating system in order to address this issue.

967332
 
Affected   Unknown   Unaffected

Arch Linux

Notified:  January 28, 2015 Updated:  January 30, 2015

Statement Date:   January 28, 2015

Status

  Affected

Vendor Statement

"Arch Linux is not vulnerable. [Arch Linux is] on a modern version of glibc so [Arch Linux] should have been safe for 18+ months."

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Addendum

If using an edition of Arch Linux older than about 18 months, you may wish to check with the vendor to find out if you need to upgrade.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Blue Coat Systems

Updated:  January 30, 2015

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

Cisco Systems, Inc.

Updated:  January 30, 2015

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

Citrix

Updated:  January 30, 2015

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

Debian GNU/Linux

Notified:  January 28, 2015 Updated:  January 28, 2015

Statement Date:   January 28, 2015

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

F5 Networks, Inc.

Updated:  January 30, 2015

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

Gentoo Linux

Notified:  January 28, 2015 Updated:  January 30, 2015

Statement Date:   January 29, 2015

Status

  Affected

Vendor Statement

"Our most recent glibc packages are not affected; we'll be issuing an

advisory anyway to inform users who may still have older versions installed."

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Juniper Networks, Inc.

Updated:  January 30, 2015

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

NEC Corporation

Updated:  October 22, 2015

Status

  Affected

Vendor Statement

"We provide information on this issue at the following URL: <http://jpn.nec.com/security-info/secinfo/nv15-007.html> (only in Japanese)."

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

NetApp

Updated:  January 30, 2015

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

Openwall GNU/*/Linux

Notified:  January 28, 2015 Updated:  January 30, 2015

Statement Date:   January 29, 2015

Status

  Affected

Vendor Statement

"Openwall GNU/*/Linux (Owl) was affected, although there's no known
attack vector that would expose the glibc bug as a vulnerability in an
install of Owl with no third-party software.  We have released glibc
updates for Owl 3.1-stable and Owl-current on 2015/01/28.
"

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Red Hat, Inc.

Notified:  January 28, 2015 Updated:  January 30, 2015

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

SUSE Linux

Notified:  January 28, 2015 Updated:  January 28, 2015

Statement Date:   January 28, 2015

Status

  Affected

Vendor Statement

"SUSE Linux Enterprise 11 and older are affected by the problem. We released
updates
for all supported and affected codestreams.

SUSE Linux Enterprise 12 is not affected by this problem.
"

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

Slackware Linux Inc.

Notified:  January 28, 2015 Updated:  January 28, 2015

Statement Date:   January 28, 2015

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

Ubuntu

Notified:  January 28, 2015 Updated:  January 28, 2015

Statement Date:   January 28, 2015

Status

  Affected

Vendor Statement

"Ubuntu 10.04 LTS (lucid) and Ubuntu 12.04 LTS (precise) were
affected; Ubuntu 14.04 LTS and newer releases were not, as they
included versions of the GNU C Library that already contained the
upstream fix.
"

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

openSUSE project

Notified:  January 28, 2015 Updated:  January 30, 2015

Statement Date:   January 28, 2015

Status

  Affected

Vendor Statement

"openSUSE 13.1 and 13.2 are not affected by the problem."

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

Addendum

Older versions of openSUSE may be affected. Check with the vendor to see if you require an upgrade.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Contiki OS

Notified:  January 28, 2015 Updated:  January 28, 2015

Statement Date:   January 28, 2015

Status

  Not Affected

Vendor Statement

"Contiki OS does not use the GNU libc resolver functions so is not affected
by this.
"

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CentOS

Notified:  January 28, 2015 Updated:  January 28, 2015

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor References

    Cray Inc.

    Notified:  January 28, 2015 Updated:  January 28, 2015

    Status

      Unknown

    Vendor Statement

    No statement is currently available from the vendor regarding this vulnerability.

    Vendor References

      Fedora Project

      Notified:  January 28, 2015 Updated:  January 28, 2015

      Status

        Unknown

      Vendor Statement

      No statement is currently available from the vendor regarding this vulnerability.

      Vendor References

        Hewlett-Packard Company

        Notified:  January 28, 2015 Updated:  January 28, 2015

        Status

          Unknown

        Vendor Statement

        No statement is currently available from the vendor regarding this vulnerability.

        Vendor References

          IBM Corporation (zseries)

          Notified:  January 28, 2015 Updated:  January 28, 2015

          Status

            Unknown

          Vendor Statement

          No statement is currently available from the vendor regarding this vulnerability.

          Vendor References

            IBM eServer

            Notified:  January 28, 2015 Updated:  January 28, 2015

            Status

              Unknown

            Vendor Statement

            No statement is currently available from the vendor regarding this vulnerability.

            Vendor References

              Mandriva S. A.

              Notified:  January 28, 2015 Updated:  January 28, 2015

              Status

                Unknown

              Vendor Statement

              No statement is currently available from the vendor regarding this vulnerability.

              Vendor References

                Oracle Corporation

                Notified:  January 28, 2015 Updated:  January 28, 2015

                Status

                  Unknown

                Vendor Statement

                No statement is currently available from the vendor regarding this vulnerability.

                Vendor References

                  Turbolinux

                  Notified:  January 28, 2015 Updated:  January 28, 2015

                  Status

                    Unknown

                  Vendor Statement

                  No statement is currently available from the vendor regarding this vulnerability.

                  Vendor References

                    View all 26 vendors View less vendors


                    CVSS Metrics

                    Group Score Vector
                    Base 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C
                    Temporal 7.8 E:POC/RL:OF/RC:C
                    Environmental 5.9 CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

                    References

                    Acknowledgements

                    Credit to Qualys for discovering the vulnerability.

                    This document was written by Garret Wassermann.

                    Other Information

                    CVE IDs: CVE-2015-0235
                    Date Public: 2015-01-28
                    Date First Published: 2015-01-28
                    Date Last Updated: 2015-10-22 13:00 UTC
                    Document Revision: 24

                    Sponsored by the Department of Homeland Security Office of Cybersecurity and Communications.