Check Point FireWall-1/VPN-1 SecuRemote/SecureClient IKE Aggressive Mode username enumeration
| fw1-ike-username-enumeration (10034) |  Low Risk |
Description:
Check Point VPN-1/FireWall-1 could allow a remote attacker to determine valid usernames. If an attacker uses either SecuRemote or SecureClient's "IKE Aggressive Mode" authentication, the firewall sends a different response depending on whether an invalid or valid username is submitted. This could allow a remote attacker to determine valid usernames and possibly gain unauthorized access to the system.
Platforms Affected:
- CheckPoint, VPN-1 FireWall-1 4.0
- CheckPoint, VPN-1 FireWall-1 4.1
Remedy:
Disable QUOT;IKE Aggressive Mode" and use "Hybrid Mode" for authentication. See References.
Consequences:
Bypass Security
References:
- BugTraq Mailing List, Tue Sep 03 2002 - 06:08:48 CDT , SecuRemote usernames can be guessed or sniffed using IKE exchange at http://archives.neohapsis.com/archives/bugtraq/2002-09/0017.html.
- Check Point Services and Downloads, IKE Aggressive Mode at http://www.checkpoint.com/techsupport/alerts/ike.html.
- Full-Disclosure Mailing List, Tue Sep 03 2002 - 16:14:40 CDT, Check Point statement on use of IKE Aggressive Mode at http://archives.neohapsis.com/archives/fulldisclosure/2002-q3/0725.html.
- SecuriTeam Mailing List, SecurityNews 9 Sept 2002, Checkpoint FW-1 VPN Security Flaw (updated) at http://www.securiteam.com/securitynews/5TP040U8AW.html.
- BID-5607: Check Point Firewall-1 SecuRemote IKE Username Guessing Vulnerability
- CVE-2002-1623: The design of the Internet Key Exchange (IKE) protocol, when using Aggressive Mode for shared secret authentication, does not encrypt initiator or responder identities during negotiation, which may allow remote attackers to determine valid usernames by (1) monitoring responses before the password is supplied or (2) sniffing, as originally reported for FireWall-1 SecuRemote.
- US-CERT VU#886601: Internet Key Exchange (IKE) protocol discloses identity when Aggressive Mode shared secret authentication is used
Reported:
Sep 03, 2002
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