[UNIX] Buffer Overflow in Liquidwar

From: SecuriTeam (support_at_securiteam.com)
Date: 09/16/03

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Date: 16 Sep 2003 15:12:36 +0200

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      Buffer Overflow in Liquidwar
    ------------------------------------------------------------------------

    SUMMARY

    ZetaLABs (Zone-H Research Laboratories) has discovered a buffer overflow
    in the game <http://www.ufoot.org/liquidwar/> Liquidwar, an application
    contained in the Debian GNU/Linux distribution.

    DETAILS

    Vulnerable systems:
     * Liquidwar version 5.4.5

    We can see the vulnerable code here:
    #define STARTUP_MAX_PATH_LENGTH 1000
    [...]
    char STARTUP_CFG_PATH[STARTUP_MAX_PATH_LENGTH];
    [...]
    static void set_path (void)
    {
    char home_path[512];
    char *home_env;
    if (exist_argument_value (IDENT_CFG))
    strcpy(STARTUP_CFG_PATH,get_argument_str (IDENT_CFG));
    else
    {
    #ifdef ALLEGRO_UNIX
    home_env=getenv("HOME");
    strcpy(home_path,home_env); /* unchecked strcpy() */
    strcat(home_path,"/");
    #else
    home_env="";
    strcpy(home_path,home_env); /* unchecked strcpy() but not dangerous */
    #endif
    strcpy(STARTUP_CFG_PATH,home_path); /* unchecked strcpy() */
    strcat(STARTUP_CFG_PATH,DEFAULT_CFG_PATH);
    }

    This vulnerability can be exploited by a local attacker to execute
    arbitrary code with gid=games privileges.

    Solution:
    It's possible to download a simple patch here:
    <http://www.zone-h.org/download/file=4943>
    http://www.zone-h.org/download/file=4943.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:secfoc@email.it> Astharot.

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