Root + Impact
Description
-
Describe the normal behavior in one or more sentences
The code fetches weather data by calling OpenWeatherMap's API to get the Current Weather code, it assigns a single weather_enum by weather condition and returns it as a uint256 integer.
-
Explain the specific issue or problem in one or more sentences
The code only evaluates the first weather condition and assigns the weather_enum based on that, ignoring any other additional weather conditions may be present. As a result, it will misrespresent weather.
const weather_id = @>weatherResponse.data.weather[0].id;<@
const weather_id_x = parseInt(weather_id / 100);
let weather_enum = 0;
if (weather_id_x === 2) weather_enum = 3;
else if (weather_id_x === 3 || weather_id_x === 5) weather_enum = 2;
else if (weather_id_x === 6) weather_enum = 5;
else if (weather_id === 800) weather_enum = 0;
else if (weather_id_x === 8) weather_enum = 1;
else weather_enum = 4; @>
Risk
Likelihood: High
-
Reason 1:
This will occur whenever the OpenWeatherMap API returns multiple weather conditions in the weather[].
-
Reason 2:
It will occur whenever the first condition weather[0] does not match a clear case (such as "haze"), causeing the code to return to default windy.
Impact: Medium to High
-
Impact 1:
User may receive inaccurate weather result, leading to a incorrect UI elements.
-
Impact 2:
The system relys on incorrect weather-based code can lead to logical errors, bad decisions.
Proof of Concept
const weatherResponse = {
data: {
weather: [
{ id: 701, main: "Mist" },
{ id: 500, main: "Light Rain" },
{ id: 802, main: "Clouds" }
]
}
};
const weather_id = weatherResponse.data.weather[0].id;
const weather_id_x = parseInt(weather_id / 100);
let weather_enum = 0;
if (weather_id_x === 2) weather_enum = 3;
else if (weather_id_x === 3 || weather_id_x === 5) weather_enum = 2;
else if (weather_id_x === 6) weather_enum = 5;
else if (weather_id === 800) weather_enum = 0;
else if (weather_id_x === 8) weather_enum = 1;
else weather_enum = 4;
console.log("Assigned weather_enum:", weather_enum);
Recommended Mitigation
- const weather_id = weatherResponse.data.weather[0].id;
- const weather_id_x = parseInt(weather_id / 100);
-
- let weather_enum = 0;
-
- if (weather_id_x === 2) weather_enum = 3;
- else if (weather_id_x === 3 || weather_id_x === 5) weather_enum = 2;
- else if (weather_id_x === 6) weather_enum = 5;
- else if (weather_id === 800) weather_enum = 0;
- else if (weather_id_x === 8) weather_enum = 1;
- else weather_enum = 4;
+ const weatherConditions = weatherResponse.data.weather;
+ let weather_enum = 4;
+
+ for (const condition of weatherConditions) {
+ const id = condition.id;
+ const category = Math.floor(id / 100);
+
+ if (id === 800) {
+ weather_enum = 0;
+ break;
+ } else if (category === 2) {
+ weather_enum = 3;
+ } else if (category === 3 || category === 5) {
+ weather_enum = Math.min(weather_enum, 2);
+ } else if (category === 6) {
+ weather_enum = Math.min(weather_enum, 5);
+ } else if (category === 8) {
+ weather_enum = Math.min(weather_enum, 1);
+ }
+ }
