An access weakness occurs when software does not properly implement permissions that could have unintended consequences if exploited by malicious actors. An example of this weakness is when a default username and password are set by the developer but do not get changed by the system administrator.
If this call fails, the program could fail to drop heightened privileges.
FreeRDP-24a752a70840f3e4b027ba7c020af71f2bcfd94a/winpr/libwinpr/sspi/sspi_winpr.c
The highlighted line of code below is the trigger point of this particular Fedora 23 access weakness.
sspi_ContextBufferFree(pvContextBuffer);
return SEC_E_OK;
}
SECURITY_STATUS SEC_ENTRY winpr_ImpersonateSecurityContext(PCtxtHandle phContext)
{
SEC_CHAR* Name;
SECURITY_STATUS status;
SecurityFunctionTableW* table;
Name = (SEC_CHAR*) sspi_SecureHandleGetUpperPointer(phContext);
if (!Name)
return SEC_E_SECPKG_NOT_FOUND;
table = sspi_GetSecurityFunctionTableWByNameA(Name);
if (!table)
return SEC_E_SECPKG_NOT_FOUND;
if (!table->ImpersonateSecurityContext)
return SEC_E_UNSUPPORTED_FUNCTION;
status = table->ImpersonateSecurityContext(phContext);
return status;
}
SECURITY_STATUS SEC_ENTRY winpr_InitializeSecurityContextW(PCredHandle phCredential, PCtxtHandle phContext,
SEC_WCHAR* pszTargetName, ULONG fContextReq, ULONG Reserved1, ULONG TargetDataRep,
PSecBufferDesc pInput, ULONG Reserved2, PCtxtHandle phNewContext,
PSecBufferDesc pOutput, PULONG pfContextAttr, PTimeStamp ptsExpiry)
{
SEC_CHAR* Name;
SECURITY_STATUS status;
SecurityFunctionTableW* table;
Name = (SEC_CHAR*) sspi_SecureHandleGetUpperPointer(phCredential);
if (!Name)
return SEC_E_SECPKG_NOT_FOUND;
table = sspi_GetSecurityFunctionTableWByNameA(Name);
if (!table)
return SEC_E_SECPKG_NOT_FOUND;
if (!table->InitializeSecurityContextW)
return SEC_E_UNSUPPORTED_FUNCTION;