[NEWS] Cisco VPN 3000 Concentrator SSL DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 03/31/05

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Date: 31 Mar 2005 18:06:48 +0200

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      Cisco VPN 3000 Concentrator SSL DoS
    ------------------------------------------------------------------------

    SUMMARY

    The Cisco VPN 3000 series concentrators are a family of purpose-built,
    remote access Virtual Private Network (VPN) platforms for data encryption
    and authentication.

    A malicious user may be able to send a crafted attack via SSL (Secure
    Sockets Layer) to Cisco's VPN concentrators leading it to reload, and/or
    drop user connections.

    DETAILS

    Vulnerable Systems:
     * Cisco VPN series that includes the models 3005, 3015, 3020, 3030, 3060,
    3080 and the Cisco VPN 3002 Hardware Client.

    Secure Sockets Layer (SSL) is a protocol used to encrypt the data
    transferred over a TCP session. SSL in Cisco products is mainly used by
    the HyperText Transfer Protocol Secure (HTTPS) web service for which the
    default TCP port is 443. Due to this vulnerability, a malicious user may
    send crafted HTTPS packets which may result in a reload of the affected
    device or and/or user connections being dropped.

    The affected products are only vulnerable if they have the HTTPS service
    enabled and the access to the service is not limited to trusted hosts or
    network management workstations. By default, HTTPS is not enabled on VPN
    3000 devices, and must be manually enabled. Affected devices are not
    vulnerable to transit traffic, only traffic that is destined to them may
    exploit this vulnerability.

    To check if the HTTPS service is enabled, one can do the following:
    1. Check the configuration on the device to verify the status of the HTTPS
    service.
    2. Try to connect to the device using a standard web browser that supports
    SSL
    using a URL similar to https://ip_address_of_device/.

    No authentication is required to exploit this vulnerability.

    Successful exploitation of this vulnerability may result in a reload of
    the affected device or and/or user connections being dropped. Repeated
    exploitation of this vulnerability could result in a sustained Denial of
    Service.

    Vendor Status:
    Cisco VPN 3000 series users can upgrade to version 4.1.7.B or later
    software to resolve this vulnerability.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:psirt@cisco.com> Cisco
    Systems Product Security Incident Response Team.
    The original article can be found at:
    <http://www.cisco.com/warp/public/707/cisco-sa-20050330-vpn3k.shtml>
    http://www.cisco.com/warp/public/707/cisco-sa-20050330-vpn3k.shtml

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