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Category:   Application (Generic)  >   Rpcbind Vendors:   libtirpc.sourceforge.net
(Red Hat Issues Fix) Rpcbind Memory Leak in rpcb_service_4() Lets Remote Users Consume Excessive Memory Resources
SecurityTracker Alert ID:  1038545
SecurityTracker URL:  http://securitytracker.com/id/1038545
CVE Reference:   CVE-2017-8779   (Links to External Site)
Date:  May 23 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability was reported in Rpcbind. A remote user can consume excessive memory on the target system.

A remote user can send a large number of specially crafted XDR messages to trigger a memory leak in rpcb_service_4() to consume excessive memory on the target system.

The vulnerability resides in the libntirpc component.

The original advisory and demonstration exploit is available at:

https://guidovranken.wordpress.com/2017/05/03/rpcbomb-remote-rpcbind-denial-of-service-patches/

Guido Vranken reported this vulnerability.

Impact:   A remote user can consume excessive memory resources on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2017:1267

Vendor URL:  access.redhat.com/errata/RHSA-2017:1267 (Links to External Site)
Cause:   Resource 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.
May 22 2017 Rpcbind Memory Leak in rpcb_service_4() Lets Remote Users Consume Excessive Memory Resources



 Source Message Contents

Subject:  [RHSA-2017:1267-01] Important: rpcbind security update

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

Synopsis:          Important: rpcbind security update
Advisory ID:       RHSA-2017:1267-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:1267
Issue date:        2017-05-23
CVE Names:         CVE-2017-8779 
=====================================================================

1. Summary:

An update for rpcbind is now available for Red Hat Enterprise Linux 6.

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

2. Relevant releases/architectures:

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

3. Description:

The rpcbind utility is a server that converts Remote Procedure Call (RPC)
program numbers into universal addresses. It must be running on the host to
be able to make RPC calls on a server on that machine.

Security Fix(es):

* It was found that due to the way rpcbind uses libtirpc (libntirpc), a
memory leak can occur when parsing specially crafted XDR messages. An
attacker sending thousands of messages to rpcbind could cause its memory
usage to grow without bound, eventually causing it to be terminated by the
OOM killer. (CVE-2017-8779)

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

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

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

1448124 - CVE-2017-8779 rpcbind, libtirpc, libntirpc: Memory leak when failing to parse XDR strings or bytearrays

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
rpcbind-0.2.0-13.el6_9.src.rpm

i386:
rpcbind-0.2.0-13.el6_9.i686.rpm
rpcbind-debuginfo-0.2.0-13.el6_9.i686.rpm

x86_64:
rpcbind-0.2.0-13.el6_9.x86_64.rpm
rpcbind-debuginfo-0.2.0-13.el6_9.x86_64.rpm

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

Source:
rpcbind-0.2.0-13.el6_9.src.rpm

x86_64:
rpcbind-0.2.0-13.el6_9.x86_64.rpm
rpcbind-debuginfo-0.2.0-13.el6_9.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
rpcbind-0.2.0-13.el6_9.src.rpm

i386:
rpcbind-0.2.0-13.el6_9.i686.rpm
rpcbind-debuginfo-0.2.0-13.el6_9.i686.rpm

ppc64:
rpcbind-0.2.0-13.el6_9.ppc64.rpm
rpcbind-debuginfo-0.2.0-13.el6_9.ppc64.rpm

s390x:
rpcbind-0.2.0-13.el6_9.s390x.rpm
rpcbind-debuginfo-0.2.0-13.el6_9.s390x.rpm

x86_64:
rpcbind-0.2.0-13.el6_9.x86_64.rpm
rpcbind-debuginfo-0.2.0-13.el6_9.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
rpcbind-0.2.0-13.el6_9.src.rpm

i386:
rpcbind-0.2.0-13.el6_9.i686.rpm
rpcbind-debuginfo-0.2.0-13.el6_9.i686.rpm

x86_64:
rpcbind-0.2.0-13.el6_9.x86_64.rpm
rpcbind-debuginfo-0.2.0-13.el6_9.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-2017-8779
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2017 Red Hat, Inc.
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