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Category:   OS (Linux)  >   systemd Vendors:   Freedesktop.org
systemd Infinite Loop in dns_packet_read_type_window() Lets Remote Users Deny Service
SecurityTracker Alert ID:  1039662
SecurityTracker URL:  http://securitytracker.com/id/1039662
CVE Reference:   CVE-2017-15908   (Links to External Site)
Date:  Oct 26 2017
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 223 through 235
Description:   A vulnerability was reported in systemd. A remote user can cause denial of service conditions on the target system.

A remote server can return specially crafted DNS NSEC resource record data to the connected target client system to trigger an infinite loop in the dns_packet_read_type_window() function in the 'systemd-resolved' service and cause the target systemd-resolve service to fail to respond.

The original advisory is available at:

https://launchpadlibrarian.net/341797217/systemd_dns_DOS.pdf

Thomas IMBERT of Sogeti ESEC R&D reported this vulnerability.

Impact:   A remote user can cause the target systemd-resolve service to fail to respond.
Solution:   The vendor has issued a source code fix, available at:

https://github.com/systemd/systemd/commit/8aeadf3052a2130b88d5bccf5439890e1034f28d

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.
Oct 26 2017 (Ubuntu Issues Fix) systemd Infinite Loop in dns_packet_read_type_window() Lets Remote Users Deny Service
Ubuntu has issued a fix for Ubuntu Linux 17.04 and 17.10.
Feb 5 2018 (Ubuntu Issues Fix) systemd Infinite Loop in dns_packet_read_type_window() Lets Remote Users Deny Service
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS and 16.04 LTS.



 Source Message Contents



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