SecurityTracker.com
    Home    |    View Topics    |    Search    |    Contact Us    |   

SecurityTracker
Archives


 


Category:   Application (Security)  >   Cisco FireSIGHT Vendors:   Cisco
(Cisco Issues Advisory for Cisco FireSIGHT) ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service
SecurityTracker Alert ID:  1036060
SecurityTracker URL:  http://securitytracker.com/id/1036060
CVE Reference:   CVE-2016-4953, CVE-2016-4954, CVE-2016-4955, CVE-2016-4956, CVE-2016-4957   (Links to External Site)
Date:  Jun 9 2016
Impact:   Denial of service via network, Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Multiple vulnerabilities were reported in ntp. A remote user can cause denial of service conditions on the target system. A remote user can modify configuration parameters in certain cases. Cisco FireSIGHT is affected.

A remote user can send a specially crafted spoofed packet containing an invalid MAC to the target system to demobilize its ephemeral association [CVE-2016-4953].

A remote user can send specially crafted spoofed packets to bypass some validation checks in the receive() function and be processed by the process_packet() function in 'ntp_proto.c' [CVE-2016-4954]. In some cases, the remote user may be able to modify certain peer variables on the target system.

A remote user can send a specially crafted spoofed packet with an invalid MAC or crypto-NAK to the target system to reset its association and potentially prevent the association from working [CVE-2016-4955]. Systems using autokey for authentication are affected.

A remote user can send specially crafted data to cause a target broadcast client to switch to interleave mode and cause the client synchronization to become disabled [CVE-2016-4956].

A remote user can send a specially crafted crypto-NAK packet to the target system to trigger a null pointer dereference and cause the ntpd process to crash [CVE-2016-4957].

Jakub Prokes of Red Hat Quality Engineering, Miroslav Lichvar of Red Hat, and Nicolas Edet of Cisco reported these vulnerabilities.

Impact:   A remote user can modify configuration parameters in certain cases.

A remote user can cause denial of service conditions, including crashing the daemon, destabilizing ephemeral associations, and disabling synchronization.

Solution:   The vendor plans to issue a fix for Cisco FireSIGHT (2nd half of 2016).

The Cisco advisory is available at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpd

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160603-ntpd (Links to External Site)
Cause:   Access control error, Input validation error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Jun 6 2016 ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service



 Source Message Contents



[Original Message Not Available for Viewing]


Go to the Top of This SecurityTracker Archive Page





Home   |    View Topics   |    Search   |    Contact Us

This web site uses cookies for web analytics. Learn More

Copyright 2019, SecurityGlobal.net LLC