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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) ntpd Flaw Lets Remote Users Modify Time on the Target ntp Service in Certain Cases
SecurityTracker Alert ID:  1037719
SecurityTracker URL:  http://securitytracker.com/id/1037719
CVE Reference:   CVE-2015-5300   (Links to External Site)
Date:  Jan 27 2017
Impact:   Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0.2, 6.2.0, 6.5, 7.0
Description:   A vulnerability was reported in ntp. A remote user that can conduct a man-in-the-middle attack can modify time on the target ntp service. Citrix XenServer is affected.

When ntpd is started with the '-g' option, a remote user that can conduct a man-in-the-middle attack can exploit a threshold limitation flaw to cause the target ntp client to make multiple steps larger than the panic threshold. This can be exploited to set the time to an arbitrary value.

The original advisory is available at:

https://www.cs.bu.edu/~goldbe/NTPattack.html

Aanchal Malhotra, Isaac E. Cohen, Erik Brakke, and Sharon Goldberg of Boston University reported this vulnerability.

Impact:   A remote user that can conduct a man-in-the-middle attack can modify time on the target ntp service.
Solution:   Citrix has issued a fix for CVE-2015-5300 for Citrix XenServer.

6.0.2 Common Criteria: CTX220078

6.2 SP1: CTX220079

6.5 SP1: CTX220080

7.0: CTX220081

The Citrix advisory is available at:

https://support.citrix.com/article/CTX220112

Vendor URL:  support.citrix.com/article/CTX220112 (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Jan 14 2016 ntpd Flaw Lets Remote Users Modify Time on the Target ntp Service in Certain Cases



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