C and C++ Binaries


IO.TAINT.FNAME : 汚染されたファイル名

要旨

ファイル名によるファイル操作で、名前の文字列が汚染されている可能性があります。

プロパティ

クラス名 Tainted Filename
日本語クラス名 汚染されたファイル名
クラス分類 セキュリティ (security)
ニーモニック IO.TAINT.FNAME
カテゴリー
MisraC2023 MisraC2023:D.4.14 The validity of values received from external sources shall be checked
Misra2012 Misra2012:D.4.14 The validity of values received from external sources shall be checked
AUTOSARC++14 AUTOSARC++14:A27-0-1 Inputs from independent components shall be validated.
CWE CWE:22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  CWE:73 External Control of File Name or Path
  CWE:99 Improper Control of Resource Identifiers ('Resource Injection')
  CWE:610 Externally Controlled Reference to a Resource in Another Sphere
  CWE:641 Improper Restriction of Names for Files and Other Resources
CERT-C CERT-C:FIO01-C Be careful using functions that use file names for identification
  CERT-C:FIO02-C Canonicalize path names originating from tainted sources
DISA-6r1 DISA-6r1:V-222612 The application must not be vulnerable to overflow attacks.
DISA-5r3 DISA-5r3:V-70277 The application must not be vulnerable to overflow attacks.
DISA-4r3 DISA-4r3:V-70277 The application must not be vulnerable to overflow attacks.
DISA-3r10 DISA-3r10:V-6157 The designer will ensure the application does not contain invalid URL or path references.
  DISA-3r10:V-16804 The designer will ensure the application does not rely solely on a resource name to control access to a resource.
OWASP-2017 OWASP-2017:A5 Broken access control
OWASP-2021 OWASP-2021:A1 Broken access control
対応言語 C および C++ で利用可能です。
有効/無効設定 このワーニングクラスのチェックはデフォルトで無効になっています。チェックを有効にするにはプロジェクト設定ファイル (configuration file)に以下の WARNING_FILTER ルールを追加してください。
WARNING_FILTER += allow class="Tainted Filename"

#include <string.h>
#include <stdio.h>
#include <fcntl.h>

int open_myinfo(){
    int ret;
    char filepath[256];

    ret = open("/usr/files/info.txt", O_RDONLY);
    if (ret >=0 ) return ret;

    printf("Could not find info.txt: please enter location");
    if (fgets(filepath, 128, stdin)){
         ret = open(strcat(filepath, "info.txt"), O_RDONLY);  /* 'Tainted Filename' warning issued here */
    }
    return ret;
}

ワーニングを引き起こす関数

CodeSonar ships with library models that allow it to a large number of functions that take a file name argument. If one of these functions is called with a potentially-tainted value in the file name parameter position, a warning will be issued.

If you have created a custom library model for some function f() in terms of one of these existing models, calls to f() will also be capable of triggering Tainted Filename warnings.

Functions that can trigger warnings include...
gcc Builtins __builtin_execl(), __builtin_execv()
libc chmod(), fopen(), stat()
Win32 PathMakeUniqueName(), _stat64(), fopen_s()

関連のある設定ファイルパラメータ

設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。