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Category:   OS (Linux)  >   systemd Vendors:   Freedesktop.org
systemd Zero-Length Notification Processing Flaw Lets Local Users Cause Denial of Service Conditions
SecurityTracker Alert ID:  1037320
SecurityTracker URL:  http://securitytracker.com/id/1037320
CVE Reference:   CVE-2016-7795, CVE-2016-7796   (Links to External Site)
Date:  Nov 22 2016
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 231
Description:   Two vulnerabilities were reported in systemd. A local user can cause denial of service conditions on the target system.

A local user can send a specially crafted zero-length notification message to a UNIX domain socket at '/run/systemd/notify' to trigger an assertion in manager_dispatch_notify_fd() and cause systemd to stop processing service notifications, denying service to various system services [CVE-2016-7795].

On some distributions, the assertion does not occur but the result still cause the notification handler to be disabled [CVE-2016-7796].

The original advisory is available at:

https://www.agwa.name/blog/post/how_to_crash_systemd_in_one_tweet

Andrew Ayer reported this vulnerability.

Impact:   A local user can cause systemd to stop processing service notifications.
Solution:   The vendor has issued a source code fix.
Vendor URL:  www.freedesktop.org/wiki/Software/systemd/ (Links to External Site)
Cause:   State error

Message History:   This archive entry has one or more follow-up message(s) listed below.
Nov 22 2016 (Red Hat Issues Fix) systemd Zero-Length Notification Processing Flaw Lets Local Users Cause Denial of Service Conditions
Red Hat has issued a fix for Red Hat Enterprise Linux 7.2.
Nov 22 2016 (Ubuntu Issues Fix) systemd Zero-Length Notification Processing Flaw Lets Local Users Cause Denial of Service Conditions
Ubuntu has issued a fix for Ubuntu 16.04 LTS.
Jan 4 2017 (Red Hat Issues Fix) systemd Zero-Length Notification Processing Flaw Lets Local Users Cause Denial of Service Conditions
Red Hat has issued a fix for Red Hat Enterprise Linux 7.1.



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