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FatFsUtil: Add some path traversal attack protection when unpacking.

This commit is contained in:
Admiral H. Curtiss 2022-06-16 04:15:28 +02:00
parent a621fdf857
commit f40eeebcf0
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GPG Key ID: F051B4C4044F33FB
1 changed files with 17 additions and 1 deletions
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18
Source/Core/Common/FatFsUtil.cpp
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@ -8,8 +8,11 @@
#include <cstdlib>
#include <mutex>
#include <string>
#include <string_view>
#include <vector>
#include <fmt/format.h>
// Does not compile if diskio.h is included first.
// clang-format off
#include "ff.h"
@ -439,8 +442,21 @@ static bool Unpack(const std::string path, bool is_directory, const char* name,
if (entry.fname[0] == '\0')
break;
if (!Unpack(path + "/" + entry.fname, entry.fattrib & AM_DIR, entry.fname, tmp_buffer))
const std::string_view childname = entry.fname;
// Check for path traversal attacks.
if (childname.find("\\") != std::string_view::npos)
return false;
if (childname.find('/') != std::string_view::npos)
return false;
if (std::all_of(childname.begin(), childname.end(), [](char c) { return c == '.'; }))
return false;
if (!Unpack(fmt::format("{}/{}", path, childname), entry.fattrib & AM_DIR, entry.fname,
tmp_buffer))
{
return false;
}
}
if (f_closedir(&directory) != FR_OK)