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CVE-2021-29425 PoC — Possible limited path traversal vulnerabily in Apache Commons IO

Source
https://github.com/shoucheng3/asf__commons-io_CVE-2021-29425_2-6
Associated Vulnerability
Title:Possible limited path traversal vulnerabily in Apache Commons IO (CVE-2021-29425)
Description:In Apache Commons IO before 2.7, When invoking the method FileNameUtils.normalize with an improper input string, like "//../foo", or "\\..\foo", the result would be the same value, thus possibly providing access to files in the parent directory, but not further above (thus "limited" path traversal), if the calling code would use the result to construct a path value.
Readme
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<!---
 +======================================================================+
 |****                                                              ****|
 |****      THIS FILE IS GENERATED BY THE COMMONS BUILD PLUGIN      ****|
 |****                    DO NOT EDIT DIRECTLY                      ****|
 |****                                                              ****|
 +======================================================================+
 | TEMPLATE FILE: readme-md-template.md                                 |
 | commons-build-plugin/trunk/src/main/resources/commons-xdoc-templates |
 +======================================================================+
 |                                                                      |
 | 1) Re-generate using: mvn commons:readme-md                          |
 |                                                                      |
 | 2) Set the following properties in the component's pom:              |
 |    - commons.componentid (required, alphabetic, lower case)          |
 |    - commons.release.version (required)                              |
 |                                                                      |
 | 3) Example Properties                                                |
 |                                                                      |
 |  <properties>                                                        |
 |    <commons.componentid>math</commons.componentid>                   |
 |    <commons.release.version>1.2</commons.release.version>            |
 |  </properties>                                                       |
 |                                                                      |
 +======================================================================+
--->
Apache Commons IO
===================

[![Build Status](https://travis-ci.org/apache/commons-io.svg?branch=master)](https://travis-ci.org/apache/commons-io)
[![Coverage Status](https://coveralls.io/repos/apache/commons-io/badge.svg?branch=master)](https://coveralls.io/r/apache/commons-io)
[![Maven Central](https://maven-badges.herokuapp.com/maven-central/commons-io/commons-io/badge.svg)](https://maven-badges.herokuapp.com/maven-central/commons-io/commons-io/)
[![License](http://img.shields.io/:license-apache-blue.svg)](http://www.apache.org/licenses/LICENSE-2.0.html)

The Apache Commons IO library contains utility classes, stream implementations, file filters,
file comparators, endian transformation classes, and much more.

Documentation
-------------

More information can be found on the [Apache Commons IO homepage](https://commons.apache.org/proper/commons-io).
The [JavaDoc](https://commons.apache.org/proper/commons-io/javadocs/api-release) can be browsed.
Questions related to the usage of Apache Commons IO should be posted to the [user mailing list][ml].

Where can I get the latest release?
-----------------------------------
You can download source and binaries from our [download page](https://commons.apache.org/proper/commons-io/download_io.cgi).

Alternatively you can pull it from the central Maven repositories:

```xml
<dependency>
  <groupId>commons-io</groupId>
  <artifactId>commons-io</artifactId>
  <version>2.6</version>
</dependency>
```

Contributing
------------

We accept Pull Requests via GitHub. The [developer mailing list][ml] is the main channel of communication for contributors.
There are some guidelines which will make applying PRs easier for us:
+ No tabs! Please use spaces for indentation.
+ Respect the code style.
+ Create minimal diffs - disable on save actions like reformat source code or organize imports. If you feel the source code should be reformatted create a separate PR for this change.
+ Provide JUnit tests for your changes and make sure your changes don't break any existing tests by running ```mvn clean test```.

If you plan to contribute on a regular basis, please consider filing a [contributor license agreement](https://www.apache.org/licenses/#clas).
You can learn more about contributing via GitHub in our [contribution guidelines](CONTRIBUTING.md).

License
-------
This code is under the [Apache Licence v2](https://www.apache.org/licenses/LICENSE-2.0).

See the `NOTICE.txt` file for required notices and attributions.

Donations
---------
You like Apache Commons IO? Then [donate back to the ASF](https://www.apache.org/foundation/contributing.html) to support the development.

Additional Resources
--------------------

+ [Apache Commons Homepage](https://commons.apache.org/)
+ [Apache Issue Tracker (JIRA)](https://issues.apache.org/jira/browse/IO)
+ [Apache Commons Twitter Account](https://twitter.com/ApacheCommons)
+ `#apache-commons` IRC channel on `irc.freenode.org`

[ml]:https://commons.apache.org/mail-lists.html
File Snapshot

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├── [1.8K]  checkstyle.xml
├── [6.4K]  CONTRIBUTING.md
├── [3.6K]  findbugs-exclude-filter.xml
├── [ 11K]  LICENSE.txt
├── [ 171]  NOTICE.txt
├── [ 14K]  pom.xml
├── [3.0K]  PROPOSAL.html
├── [5.4K]  README.md
├── [ 47K]  RELEASE-NOTES.txt
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    │       └── [4.0K]  org
    │           └── [4.0K]  apache
    │               └── [4.0K]  commons
    │                   └── [4.0K]  io
    │                       ├── [5.7K]  ByteOrderMark.java
    │                       ├── [2.5K]  ByteOrderParser.java
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    │                       │   ├── [4.4K]  CompositeFileComparator.java
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    │                       │   ├── [2.8K]  DirectoryFileComparator.java
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    │                       │   ├── [2.9K]  LastModifiedFileComparator.java
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    │                       │   └── [5.1K]  SizeFileComparator.java
    │                       ├── [ 16K]  CopyUtils.java
    │                       ├── [ 25K]  DirectoryWalker.java
    │                       ├── [ 17K]  EndianUtils.java
    │                       ├── [6.9K]  FileCleaner.java
    │                       ├── [ 11K]  FileCleaningTracker.java
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    │                       ├── [1.6K]  FileExistsException.java
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    │                       │   ├── [2.3K]  DirectoryFileFilter.java
    │                       │   ├── [2.6K]  EmptyFileFilter.java
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    │                       │   ├── [1.9K]  FileFileFilter.java
    │                       │   ├── [ 28K]  FileFilterUtils.java
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    │                       │   ├── [1.7K]  IOFileFilter.java
    │                       │   ├── [9.4K]  MagicNumberFileFilter.java
    │                       │   ├── [6.5K]  NameFileFilter.java
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    │                       │   ├── [4.1K]  RegexFileFilter.java
    │                       │   ├── [3.6K]  SizeFileFilter.java
    │                       │   ├── [6.8K]  SuffixFileFilter.java
    │                       │   ├── [2.1K]  TrueFileFilter.java
    │                       │   ├── [7.1K]  WildcardFileFilter.java
    │                       │   └── [4.8K]  WildcardFilter.java
    │                       ├── [ 56K]  FilenameUtils.java
    │                       ├── [ 23K]  FileSystemUtils.java
    │                       ├── [130K]  FileUtils.java
    │                       ├── [5.8K]  HexDump.java
    │                       ├── [4.0K]  input
    │                       │   ├── [3.3K]  AutoCloseInputStream.java
    │                       │   ├── [ 13K]  BOMInputStream.java
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    │                       │   ├── [3.8K]  ClassLoaderObjectInputStream.java
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    │                       │   ├── [1.7K]  CloseShieldInputStream.java
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    │                       │   ├── [ 11K]  NullInputStream.java
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    │                       │   ├── [7.6K]  ProxyInputStream.java
    │                       │   ├── [8.2K]  ProxyReader.java
    │                       │   ├── [ 11K]  ReaderInputStream.java
    │                       │   ├── [ 14K]  ReversedLinesFileReader.java
    │                       │   ├── [7.9K]  SwappedDataInputStream.java
    │                       │   ├── [4.0K]  TaggedInputStream.java
    │                       │   ├── [ 21K]  Tailer.java
    │                       │   ├── [2.2K]  TailerListenerAdapter.java
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    │                       │   ├── [5.1K]  TeeInputStream.java
    │                       │   ├── [3.7K]  UnixLineEndingInputStream.java
    │                       │   ├── [3.8K]  WindowsLineEndingInputStream.java
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    │                       │   └── [ 32K]  XmlStreamReader.java
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    │                       ├── [128K]  IOUtils.java
    │                       ├── [6.4K]  LineIterator.java
    │                       ├── [4.0K]  monitor
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    │                       │   ├── [ 16K]  FileAlterationObserver.java
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    │                       ├── [4.0K]  output
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    │                       │   ├── [1.9K]  RegexpClassNameMatcher.java
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    │                       ├── [4.5K]  TaggedIOException.java
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    │   ├── [2.5K]  site.xml
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    │       ├── [5.2K]  bestpractices.xml
    │       ├── [3.0K]  building.xml
    │       ├── [ 10K]  description.xml
    │       ├── [7.7K]  download_io.xml
    │       ├── [4.9K]  index.xml
    │       ├── [5.7K]  issue-tracking.xml
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        │   └── [4.0K]  org
        │       └── [4.0K]  apache
        │           └── [4.0K]  commons
        │               └── [4.0K]  io
        │                   ├── [5.9K]  ByteOrderMarkTestCase.java
        │                   ├── [1.5K]  ByteOrderParserTest.java
        │                   ├── [2.9K]  CharsetsTestCase.java
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        │                   │   ├── [4.8K]  CompositeFileComparatorTest.java
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        │                   ├── [5.7K]  FileDeleteStrategyTestCase.java
        │                   ├── [4.0K]  filefilter
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        │                   │   ├── [5.6K]  IOFileFilterAbstractTestCase.java
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        │                   │   ├── [2.6K]  ReversedLinesFileReaderTestSimple.java
        │                   │   ├── [4.2K]  SwappedDataInputStreamTest.java
        │                   │   ├── [4.3K]  TaggedInputStreamTest.java
        │                   │   ├── [ 18K]  TailerTest.java
        │                   │   ├── [3.4K]  TeeInputStreamTest.java
        │                   │   ├── [2.6K]  UnixLineEndingInputStreamTest.java
        │                   │   ├── [2.6K]  WindowsLineEndingInputStreamTest.java
        │                   │   ├── [ 22K]  XmlStreamReaderTest.java
        │                   │   └── [ 19K]  XmlStreamReaderUtilitiesTest.java
        │                   ├── [ 16K]  IOCaseTestCase.java
        │                   ├── [2.1K]  IOExceptionWithCauseTestCase.java
        │                   ├── [ 17K]  IOUtilsCopyTestCase.java
        │                   ├── [ 58K]  IOUtilsTestCase.java
        │                   ├── [ 29K]  IOUtilsWriteTestCase.java
        │                   ├── [ 15K]  LineIteratorTestCase.java
        │                   ├── [4.0K]  monitor
        │                   │   ├── [6.0K]  AbstractMonitorTestCase.java
        │                   │   ├── [5.0K]  CollectionFileListener.java
        │                   │   ├── [5.8K]  FileAlterationMonitorTestCase.java
        │                   │   └── [ 17K]  FileAlterationObserverTestCase.java
        │                   ├── [4.0K]  output
        │                   │   ├── [1.6K]  AppendableOutputStreamTest.java
        │                   │   ├── [2.4K]  BrokenOutputStreamTest.java
        │                   │   ├── [7.6K]  ByteArrayOutputStreamTestCase.java
        │                   │   ├── [2.5K]  ChunkedOutputStreamTest.java
        │                   │   ├── [2.5K]  ChunkedWriterTest.java
        │                   │   ├── [1.7K]  ClosedOutputStreamTest.java
        │                   │   ├── [1.9K]  CloseShieldOutputStreamTest.java
        │                   │   ├── [4.0K]  CountingOutputStreamTest.java
        │                   │   ├── [ 13K]  DeferredFileOutputStreamTest.java
        │                   │   ├── [8.6K]  FileWriterWithEncodingTest.java
        │                   │   ├── [7.1K]  LockableFileWriterTest.java
        │                   │   ├── [1.4K]  NullOutputStreamTest.java
        │                   │   ├── [1.3K]  NullWriterTest.java
        │                   │   ├── [1.8K]  ProxyOutputStreamTest.java
        │                   │   ├── [9.2K]  ProxyWriterTest.java
        │                   │   ├── [4.8K]  StringBuilderWriterTest.java
        │                   │   ├── [4.3K]  TaggedOutputStreamTest.java
        │                   │   ├── [4.2K]  TeeOutputStreamTest.java
        │                   │   ├── [1.8K]  ThresholdingOutputStreamTest.java
        │                   │   ├── [5.2K]  WriterOutputStreamTest.java
        │                   │   └── [5.0K]  XmlStreamWriterTest.java
        │                   ├── [1.8K]  SelectorAdapter.java
        │                   ├── [4.0K]  serialization
        │                   │   ├── [1.6K]  ClosingBase.java
        │                   │   ├── [1.5K]  FullClassNameMatcherTest.java
        │                   │   ├── [1.4K]  MockSerializedClass.java
        │                   │   ├── [1.9K]  MoreComplexObject.java
        │                   │   ├── [3.9K]  MoreComplexObjectTest.java
        │                   │   ├── [2.1K]  RegexpClassNameMatcherTest.java
        │                   │   ├── [7.6K]  ValidatingObjectInputStreamTest.java
        │                   │   └── [1.7K]  WildcardClassNameMatcherTest.java
        │                   ├── [1.7K]  TaggedIOExceptionTest.java
        │                   ├── [4.0K]  testtools
        │                   │   ├── [8.7K]  TestUtils.java
        │                   │   ├── [1.4K]  YellOnCloseInputStream.java
        │                   │   └── [2.2K]  YellOnFlushAndCloseOutputStream.java
        │                   └── [2.5K]  ThreadMonitorTestCase.java
        └── [4.0K]  resources
            ├── [4.0K]  org
            │   └── [4.0K]  apache
            │       └── [4.0K]  commons
            │           └── [4.0K]  io
            │               ├── [   6]  FileUtilsTestDataCR.dat
            │               ├── [   9]  FileUtilsTestDataCRLF.dat
            │               ├── [   6]  FileUtilsTestDataLF.dat
            │               ├── [6.7K]  testfileBOM.xml
            │               └── [6.7K]  testfileNoBOM.xml
            ├── [  20]  test-file-20byteslength.bin
            ├── [   0]  test-file-empty.bin
            ├── [  20]  test-file-gbk.bin
            ├── [1.4K]  test-file-iso8859-1.bin
            ├── [  27]  test-file-iso8859-1-shortlines-win-linebr.bin
            ├── [  53]  test-file-shiftjis.bin
            ├── [   5]  test-file-simple-utf8.bin
            ├── [2.8K]  test-file-utf16be.bin
            ├── [2.8K]  test-file-utf16le.bin
            ├── [1.7K]  test-file-utf8.bin
            ├── [1.7K]  test-file-utf8-cr-only.bin
            ├── [1.7K]  test-file-utf8-win-linebr.bin
            ├── [  22]  test-file-windows-31j.bin
            ├── [  18]  test-file-x-windows-949.bin
            └── [  20]  test-file-x-windows-950.bin

39 directories, 303 files
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