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Insecure Library Loading
Not critical

Juniper Netscreen IPSec VPN Username Enumeration Weakness

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Release Date:  2005-08-18    Last Update:  2005-08-24    Views:  12,436

Secunia Advisory SA16474

Where:

From remote

Impact:

Exposure of system information

Solution Status:

Vendor Workaround

CVE Reference(s):

Description


NTA Monitor has reported a weakness in Juniper Netscreen VPN, which can be exploited by malicious people to gain knowledge of certain information.

The weakness is caused due to the device returning different responses depending on whether or not a valid username is supplied. This can be exploited to enumerate valid usernames, which can be used to obtain password hashes.

Successful exploitation requires that the device is configured to use IKE aggressive mode with pre-shared key authentication.

The weakness has been reported in ScreenOS software versions up to 5.2.0.


Solution:
See vendor advisory for workarounds.

Provided and/or discovered by:
NTA Monitor

Original Advisory:
Juniper Networks:
http://www.juniper.net/support/security/alerts/adv5212.txt

NTA Monitor:
http://www.nta-monitor.com/news/vpn-flaws/juniper/netscreen/index.htm

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Juniper Netscreen IPSec VPN Username Enumeration Weakness

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