Bug 1470706 (CVE-2017-11171) - CVE-2017-11171 gnome-session: Bad reference counting in accept_ice_connection() permits resource exhaustion
Summary: CVE-2017-11171 gnome-session: Bad reference counting in accept_ice_connection...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2017-11171
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:
Depends On: 1470707
Blocks: 1470723
TreeView+ depends on / blocked
 
Reported: 2017-07-13 13:48 UTC by Pedro Sampaio
Modified: 2019-09-29 14:16 UTC (History)
2 users (show)

Fixed In Version:
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Doc Text:
A denial-of-service flaw was found in the way gnome-session handled ICE connections. A local, authenticated attacker could potentially use this flaw to cause the gnome-session process to exhaust its file descriptors and enter an infinite loop, thereby leading to denial of service.
Clone Of:
Environment:
Last Closed: 2017-09-04 04:33:21 UTC
Embargoed:

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Description Pedro Sampaio 2017-07-13 13:48:18 UTC 
Bad reference counting in the context of accept_ice_connection() in gsm-xsmp-server.c in old versions of gnome-session up until version 2.29.92 allows a local attacker to establish ICE connections to gnome-session with invalid authentication data (an invalid magic cookie). Each failed authentication attempt will leak a file descriptor in gnome-session. When the maximum number of file descriptors is exhausted in the gnome-session process, it will enter an infinite loop trying to communicate without success, consuming 100% of the CPU. The graphical session associated with the gnome-session process will stop working correctly, because communication with gnome-session is no longer possible.

Upstream patch:

https://github.com/GNOME/gnome-session/commit/b0dc999e0b45355314616321dbb6cb71e729fc9d

References:

https://bugzilla.suse.com/show_bug.cgi?id=1025068
https://bugzilla.suse.com/show_bug.cgi?id=1048274
http://seclists.org/oss-sec/2017/q3/121
Comment 1 Pedro Sampaio 2017-07-13 13:48:38 UTC 
Created gnome-session tracking bugs for this issue:

Affects: fedora-all [bug 1470707]
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