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| CodeSonar® 9.2p0 | CONFIDENTIAL | CodeSecure Inc |
Tainted data flows into a field annotated as [PathTrusted], or into a file path creation method.
See the OWASP page on Path Traversal for more information.
Checks for this class use the CodeSonar C# taint analysis. See Taint Tracking for CodeSonar C# Warning Classes for more information on this analysis, including lists of the methods that CodeSonar automatically recognizes as relevant and information about specifying additional methods that CodeSonar should recognize as taint sources, sinks, or sanitizers.
Use configuration parameter CSHARP_ANALYSIS_ADVANCED_INJECTION to specify the level of checking to perform for this and other taint-related warning classes:
| Class Name | Tainted Path (C#) | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Significance | security | |||||||||||||||||||||||||||
| Mnemonic | CSHARP.IO.TAINT.PATH | |||||||||||||||||||||||||||
| Categories |
|
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| Availability | Available for C# only. |
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| Enabling | Checks for this warning class are enabled by
default. To disable them, add the following WARNING_FILTER rule to the
project configuration file.
WARNING_FILTER += discard class="Tainted Path (C#)" |
Japanese (ja)
using System;
using System.IO;
using System.Net;
namespace DocumentationExample
{
class OtherInjectionExamples
{
static void Main(string[] args)
{
string input = GetUserInput();
CommandInjectionExample(input);
PathInjectionExample(input);
UrlInjectionExample(input);
}
private static String GetUserInput()
{
return Console.ReadLine();
}
private static void CommandInjectionExample(String input)
{
try
{
System.Diagnostics.Process.Start("CMD.exe", input); // Command Injection (C#) warning issued here
} catch (Exception e)
{
Console.WriteLine("invalid command: " + e.Message);
}
}
private static void PathInjectionExample(string input)
{
try
{
File.Delete(input); // Tainted Path (C#) warning issued here
} catch (Exception e)
{
Console.WriteLine("unable to delete file: " + e.Message);
}
}
private static void UrlInjectionExample(String input)
{
try
{
WebRequest request = WebRequest.Create(input); // Tainted URL (C#) warning issued here
// ...
WebResponse response = request.GetResponse();
using (Stream dataStream = response.GetResponseStream())
{
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
Console.WriteLine(responseFromServer);
}
response.Close();
}
catch (Exception e)
{
Console.WriteLine("request error: " + e.Message);
}
}
}
}
Verify that a security error actually corresponds to unconstrained information flow from source locations into sink locations. If this is the case, add a sanitizing algorithm to clean data before it flows into sinks, or use prepared statements for SQL queries rather than free queries built from string concatenation.
The following configuration file parameters affect checks for this warning class.
To report problems with this documentation, please visit https://support.codesecure.com/.