Bug 1620290 (CVE-2018-14621) - CVE-2018-14621 libtirpc: Infinite loop in EMFILE case in svc_vc.c
Summary: CVE-2018-14621 libtirpc: Infinite loop in EMFILE case in svc_vc.c
Status: CLOSED NOTABUG
Alias: CVE-2018-14621
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=low,public=20160303,reported=2...
Keywords: Security
Depends On:
Blocks: 1620296
TreeView+ depends on / blocked
 
Reported: 2018-08-22 21:46 UTC by Laura Pardo
Modified: 2019-06-11 11:13 UTC (History)
24 users (show)

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An infinite loop vulnerability was found in libtirpc. With the port to using poll rather than select, exhaustion of file descriptors would cause the server to enter an infinite loop, consuming a large amount of CPU time and denying service to other clients until restarted.
Clone Of:
(edit)
Last Closed: 2019-06-10 10:36:28 UTC


Attachments (Terms of Use)

Description Laura Pardo 2018-08-22 21:46:07 UTC
A flaw was found in libtirpc before version 1.0.2-rc2. With the port to poll, and endless loop can be created when running out of file descriptors.


References:
https://bugzilla.novell.com/show_bug.cgi?id=968175

Upstream Patch:
http://git.linux-nfs.org/?p=steved/libtirpc.git;a=commit;h=fce98161d9815ea016855d9f00274276452c2c4b

Comment 1 Doran Moppert 2018-08-23 02:55:52 UTC
This was introduced with the port to using poll() instead of select() around 0.3.3.  Prior versions use a different strategy when EMFILE/ENFILE is hit:  the "most idle" connection is dropped before retrying.


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