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Category:   Application (Generic)  >   Rpcbind Vendors:   libtirpc.sourceforge.net
Rpcbind Memory Leak in rpcb_service_4() Lets Remote Users Consume Excessive Memory Resources
SecurityTracker Alert ID:  1038532
SecurityTracker URL:  http://securitytracker.com/id/1038532
CVE Reference:   CVE-2017-8779   (Links to External Site)
Updated:  May 22 2017
Original Entry Date:  May 22 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:   The vendor has issued a source code fix, available at:

http://git.linux-nfs.org/?p=steved/rpcbind.git;a=blob;f=src/pmap_svc.c;h=26c31d0f824f0eeff2f269310ca6dac34d5df1f9;hb=c49a7ea639eb700823e174fd605bbbe183e229aa

Vendor URL:  sourceforge.net/projects/libtirpc/ (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
May 22 2017 (Red Hat Issues Fix) Rpcbind Memory Leak in rpcb_service_4() Lets Remote Users Consume Excessive Memory Resources
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
May 23 2017 (Red Hat Issues Fix) Rpcbind Memory Leak in rpcb_service_4() Lets Remote Users Consume Excessive Memory Resources
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
May 24 2017 (CentOS Issues Fix) Rpcbind Memory Leak in rpcb_service_4() Lets Remote Users Consume Excessive Memory Resources
CentOS has issued a fix for CentOS 6.
May 24 2017 (Oracle Issues Fix for Oracle Linux) Rpcbind Memory Leak in rpcb_service_4() Lets Remote Users Consume Excessive Memory Resources
Oracle has issued a fix for Oracle Linux 6.



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