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Category:   Device (Embedded Server/Appliance)  >   Cisco Unified Computing System Vendors:   Cisco
(Cisco Issues Advisory for Cisco UCS Central) Ntpd Symmetric Mode Packet Processing Flaw Lets Remote Users Deny Service
SecurityTracker Alert ID:  1032073
SecurityTracker URL:
CVE Reference:   CVE-2015-1799   (Links to External Site)
Date:  Apr 10 2015
Impact:   Denial of service via network
Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability was reported in Ntpd. A remote user can cause denial of service conditions on the target system. Cisco UCS Central is affected.

A remote user with knowledge of a symmetric association between two hosts can periodically send a specially crafted packet to one host of the symmetric association to cause both hosts to fail to synchronize.

Systems that are configured to use symmetric key authentication are affected.

Miroslav Lichvar of Red Hat reported this vulnerability.

Impact:   A remote user can cause two hosts of a symmetric association to fail to synchronize.
Solution:   Cisco has issued an advisory for Cisco UCS Central.

Cisco has assigned bug ID CSCut77422 to this vulnerability.

The Cisco advisory is available at:

Vendor URL: (Links to External Site)
Cause:   State error

Message History:   This archive entry is a follow-up to the message listed below.
Apr 7 2015 Ntpd Symmetric Mode Packet Processing Flaw Lets Remote Users Deny Service

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