[UNIX] Buffer Overflow in Liquidwar

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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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