BSA-2017-225
21530
31 March 2017
31 March 2017
Closed
Low
3.7
N/A
CVE-2016-7429
Summary
Security Advisory ID : BSA-2017-225
Component : ntp
Revision : 1.0: Interim
When ntpd receives a server response on a socket that corresponds to a different interface than was used for the request, the peer structure is updated to use the interface for new requests. If ntpd is running on a host with multiple interfaces in separate networks and the operating system doesn't check source address in received packets (e.g. rp_filter on Linux is set to 0), an attacker that knows the address of the source can send a packet with spoofed source address which will cause ntpd to select wrong interface for the source and prevent it from sending new requests until the list of interfaces is refreshed, which happens on routing changes or every 5 minutes by default. If the attack is repeated often enough (once per second), ntpd will not be able to synchronize with the source.
Affected Products
Product | Current Assessment |
---|---|
Brocade 5400 vRouter | Impacted: Fixed in 17.1.0. |
Brocade 5600 vRouter | Impacted: Fixed in 6.7R13. |
Products Confirmed Not Vulnerable
Brocade Fabric OS, Brocade FastIron OS, Brocade NetIron OS, Brocade Network Advisor, Brocade Network OS, Brocade SDN Controller, Brocade ServerIron ADX, Brocade SLX-OS, Brocade Virtual ADX, BrocadeVirtual Traffic Manager: Software, and Brocade Virtual Web Application Firewall are confirmed not affected by this vulnerability.
Workaround
There are no workarounds that address this vulnerability.
Revision History
Version | Change | Date |
---|---|---|
1.0 | Initial Publication | March 31, 2017 |