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Category:   Device (Router/Bridge/Hub)  >   Juniper Junos Vendors:   Juniper
Juniper Junos Short MacSec Key Weakness May Let Remote Users Conduct Man-in-the-Middle Attacks to Recover Key Passphrases
SecurityTracker Alert ID:  1040789
SecurityTracker URL:  http://securitytracker.com/id/1040789
CVE Reference:   CVE-2018-0021   (Links to External Site)
Date:  Apr 28 2018
Impact:   Disclosure of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 14.1, 14.1X53, 15.1, 15.1X49, 15.1X53, 16.1, 16.2, 17.1
Description:   A vulnerability was reported in Juniper Junos. A remote user may be able to recover key passphrases in certain cases.

On systems configured with short MacSec keys, if all 64 digits of the connectivity association name (CKN) key or all 32 digits of the connectivity association key (CAK) key are not configured, all remaining digits will be auto-configured to 0. As a result, a remote user that can conduct a man-in-the-middle attack may be able to spoof packets and conduct guessing attacks to recover the passphrases for the keys.

The vendor has assigned PR 1251909 to this vulnerability.

Impact:   A remote user that can conduct a man-in-the-middle attack may be able to recover key passphrases in certain cases.
Solution:   The vendor has issued a fix (14.1R9, 14.1X53-D47, 15.1R4-S9, 15.1R6-S6, 15.1R7, 15.1X49-D100, 15.1X53-D59, 16.1R3-S8, 16.1R4-S8, 16.1R5, 16.2R1-S6, 16.2R2, 17.1R2, 17.2R1).

The vendor advisory is available at:

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10854

Vendor URL:  kb.juniper.net/InfoCenter/index?page=content&id=JSA10854 (Links to External Site)
Cause:   Access control error

Message History:   None.


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