[NT] ZoneAlarm Invalid Pointer Dereference Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 02/13/05

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      ZoneAlarm Invalid Pointer Dereference Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.zonelabs.com/> Zone Labs ZoneAlarm "provides personal
    firewall protection". Local exploitation of an invalid pointer dereference
    vulnerability in Zone Labs LLC's ZoneAlarm personal firewall allows
    attackers to trigger a denial of service (DoS) condition.

    DETAILS

    Vulnerable Systems:
     * ZoneAlarm version 5.1 and prior

    Immune Systems:
     * ZoneAlarm version 5.5 or newer

    ZoneAlarm offers process specific protection by hooking the kernel API
    routine NtConnectPort(). NtConnectPort() is used by programs to implement
    advanced inter-process communication (IPC). The NtConnectPort() function
    is declared as follows:
        NtConnectPort(
            OUT PHANDLE ClientPortHandle,
            IN PUNICODE_STRING ServerPortName,
            IN PSECURITY_QUALITY_OF_SERVICE SecurityQos,
            IN OUT PLPC_SECTION_OWNER_MEMORY ClientSharedMemory OPTIONAL,
            OUT PLPC_SECTION_MEMORY ServerSharedMemory OPTIONAL,
            OUT PULONG MaximumMessageLength OPTIONAL,
            IN OUT PVOID ConnectionInfo OPTIONAL,
            IN OUT PULONG ConnectionInfoLength OPTIONAL);

    The problem specifically exists within vsdatant.sys as ZoneAlarm fails to
    verify the second argument. 'ServerPortName' is a valid address prior to
    derefencing it as a pointer. The vulnerable section of code is displayed
    here:
        0001EE93 mov esi, [esp+108h+ServerPortName]
        0001EE9A mov edi, eax
        0001EE9C test esi, esi
        0001EE9E jz short loc_1EEB6
        0001EEA0 mov edx, [esi+4]

    The argument 'ServerPortName' is stored in the register ESI. A check is
    made to ensure that the value is not NULL. If that check is passed, the
    value is dereferenced as a pointer. Any non-zero invalid memory address
    can be passed as the second argument to NtConnectPort(), resulting in a
    system crash.

    Analysis:
    Exploitation allows local and remote attackers who have exploited another
    vulnerability to trigger a DoS in kernel space, resulting in a "blue
    screen of death."

    Vendor response:
    A vendor advisory for this issue is available at:
    <http://download.zonelabs.com/bin/free/securityAlert/19.html>
    http://download.zonelabs.com/bin/free/securityAlert/19.html

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0114>
    CAN-2005-0114

    Disclosure Timeline:
    01/06/2005 - Initial vendor notification
    01/07/2005 - Initial vendor response
    02/11/2005 - Coordinated public disclosure

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:idlabs-advisories@idefense.com> iDEFENSE.
    The original article can be found at:
    <http://www.idefense.com/application/poi/display?id=199&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=199&type=vulnerabilities

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