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From: K. van der Raad (k.van.der.raaditsec.nl)
Date: Thu Jul 12 2001 - 07:41:24 CDT

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    Hi,

    We stumbled across the following vulnerability alert and did not see
    this issue in Bugtraq yet:

    http://www.checkpoint.com/techsupport/alerts/format_strings.html

    --
    

    July 11, 2001

    Summary: A security issue exists in VPN-1/FireWall-1 version 4.1 whereby a valid firewall administrator connecting from an authorized management client may send malicious data to a management station inside a control connection, possibly preventing proper operation of the management station. This issue exists because some instances of improper string formatting occur in VPN-1/FireWall-1 version 4.1. By sending specially constructed commands through authorized communication channels, arbitrary code may be inserted onto the operating system stack of a VPN-1/FireWall-1 management station. This vulnerability may only be exploited by an authorized and authenticated VPN-1/FireWall-1 administrator connecting from a workstation explicitly trusted by the management station, although read/write permission is not required in order to perform this attack. Since full access (read/write) administrators and those at the local system console already have direct access to the firewall system, this is an escalation of privilege only for read-only administrators.

    Solution: For all users, upgrade to VPN-1/FireWall-1 4.1 Service Pack 4 and install the SP4 hotfix. This hotfix only needs to be applied to management stations, not firewall modules.

    Check Point/Nokia Appliances (IPSO) and AIX Note: Since 4.1 SP3 is the most recent version of VPN-1/FireWall-1 released for these platforms, the hotfix for these will be released for 4.1 SP3. Future service packs will incorporate the fix.

    Who is affected: All installations of VPN-1/FireWall-1 which allow remote GUI connections should be assumed vulnerable to this exploit. It should be noted again that the attack must be made by an authorized and valid VPN-1/FireWall-1 administrator connecting from an authorized GUI client station.

    Immediate workaround: Restrict remote GUI access for read/only firewall administrators; review list of administrators and authorized GUI clients.

    Changes made in the hotfix: Improper string formatting statements have been converted to secure ones in this hotfix and all future releases. This has no other impact on firewall operation.

    Download information: For AIX, HPUX, Linux, Solaris, Windows NT & Windows 2000 select the following options from the Software Subscription Download Site:

    Product: VPN-1/ FireWall-1 or Provider-1 Version: 4.1 Operating System: [Appropriate OS] Encryption: [VPN+Des or VPN+Strong] SP/Patch Level: [Appropriate Hotfix]

    For IPSO 3.3 select the following options from the Software Subscription Download Site:

    Product: Nokia IP Series Appliance Version: 4.1 Operating System: IPSO 3.3 Encryption: [VPN+Des or VPN+Strong] SP/Patch Level: Format String Hotfix for SP3 (IPSO 3.3 Only)

    Acknowledgement: This issue has been reported to Check Point by Halvar Flake, senior reverse engineer of BlackHat Consulting.

    -- Kevin van der Raad <mailto:k.van.der.raaditsec.nl> ITsec Nederland B.V. <http://www.itsec.nl> Informatiebeveiliging Exploit & Vulnerability Alerting Service P.O. box 5120 NL 2000 GC Haarlem Tel +31(0)23 542 05 78 Fax +31(0)23 534 54 77 --

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