Java: CWE-200: Temp directory local information disclosure vulnerability #4388

JLLeitschuh · 2020-10-02T04:52:57Z

This vulnerability detects the use of the local temporary directory in ways that potentially expose sensitive information to other users.

Some examples

public class TempDirUsageVulnerable {
    void exampleVulnerable() {
        File temp1 = File.createTempFile("random", ".txt"); // BAD: File has permissions `-rw-r--r--`

        File temp2 = File.createTempFile("random", "file", null); // BAD: File has permissions `-rw-r--r--`

        File systemTempDir = new File(System.getProperty("java.io.tmpdir"));
        File temp3 = File.createTempFile("random", "file", systemTempDir); // BAD: File has permissions `-rw-r--r--`

        File tempDir = com.google.common.io.Files.createTempDir(); // BAD: CVE-2020-8908: Directory has permissions `drwxr-xr-x`

        new File(System.getProperty("java.io.tmpdir"), "/child").mkdir(); // BAD: Directory has permissions `-rw-r--r--`

        File tempDirChildFile = new File(System.getProperty("java.io.tmpdir"), "/child-create-file.txt");
        Files.createFile(tempDirChildFile.toPath()); // BAD: File has permissions `-rw-r--r--`
    }
}

aibaars · 2020-10-08T10:32:23Z

java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclosure1.ql

+ * @kind problem
+ * @problem.severity warning
+ * @precision very-high
+ * @id java/local-information-disclosure


This id is rather generic. Could you make it a bit more specific to this query?

Fixed, I think

java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclosure2.ql

aibaars · 2020-10-08T10:37:48Z

For reference I think Apache Ant had a similar vulnerability CVE-2020-1945. I think this was addressed by

You might want to check your query on databases built from those commits and their parents.

JLLeitschuh · 2020-10-12T15:19:42Z

Here's one that I found that was just disclosed.
GHSA-269g-pwp5-87pp

melloware · 2020-10-12T15:26:19Z

@JLLeitschuh So if Junit 4.13.1 can patch this fix why can't Guava?

JLLeitschuh · 2020-10-12T16:20:15Z

@melloware 🤷‍♂️ bring it up with the Guava & Google team. There's only so much I can do.

melloware · 2020-10-12T16:21:45Z

Can we submit a PR against that ticket for review making the same fix Junit did?

JLLeitschuh · 2020-10-12T16:25:12Z

You can always submit a PR, I don't know if the Google team will accept it thought. I'd advise that you ask them if they'd consider accepting a PR on the existing issue:

google/guava#4011

It's probably not that useful to have this discussion here, on this unrelated issue.

java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclosure2.ql

aibaars · 2020-10-14T08:25:26Z

java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclosure2.ql

+    exists(MethodAccess ma |
+      ma.getMethod() instanceof MethodFileSystemFileCreation and
+      ma.getQualifier() = this.asExpr()
+    )


You could write:

Suggested change

exists(MethodAccess ma |

ma.getMethod() instanceof MethodFileSystemFileCreation and

ma.getQualifier() = this.asExpr()

)

exists(MethodFileSystemFileCreation ma |

ma.getQualifier() = this.asExpr()

)

This is not quite right. MethodFileSystemFileCreation is a Method not a MethodAccess

Yea, I don't think I can change this to be simpler at all.

java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclosure2.ql

JLLeitschuh · 2020-11-10T19:59:18Z

There are some outstanding disclosures and CVES from this query. Hence why development is kinda frozen. I'm still leveraging it to report vulns.

JLLeitschuh · 2021-01-23T19:19:44Z

Test run of this query:

Method Call: https://lgtm.com/query/3077692672321886364/
Path: https://lgtm.com/query/5276757681085693414/

JLLeitschuh · 2021-01-23T23:49:00Z

This PR is now in a "I think I'm happy with it, please review" state. 😃

aibaars · 2021-01-25T08:31:02Z

This PR is now in a "I think I'm happy with it, please review" state.

In that case you might want to hit the Ready for review button to change from Draft to Review state ;-)

JLLeitschuh · 2021-01-25T11:53:56Z

Good point 😂

smowton · 2021-01-27T11:01:18Z

Assigned @aibaars since he has been reviewing this and moved to In Progress state

JLLeitschuh · 2022-02-08T18:22:42Z

False positives this is finding (the first path). However, other paths are valid.

https://lgtm.com/query/8810980313419129810/
There is a vulnerability here, but it's being incorrectly identified around the reason.

To simplify, the vulnerability being identified here is because of the following:

new File(System.getProperty("java.io.tmpdir")).mkdirs(); // Not really a vulnerability technically

This doesn't seem like a vulnerability.

However, the following is information disclosure of the file's name:

File tempDir = new File(System.getProperty("java.io.tmpdir"));
tempDir.mkdirs();
File tempFile = new File (tempDir, [USER_INPUT]); // vulnerability
tempFile.createFile(); // vulnerability

…ue) to be safe

smowton · 2022-02-09T11:34:48Z

Looks like you're still tweaking this; let me know when you're done?

java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclosure.ql

JLLeitschuh · 2022-02-09T15:06:53Z

Looks like you're still tweaking this; let me know when you're done?

I'm wondering if you have any insights into how to fix the problem I described here:

#4388 (comment)

…sure.ql Co-authored-by: Chris Smowton <smowton@github.com>

JLLeitschuh · 2022-02-09T16:05:35Z

I think I have a fix here that I'm happy with:
49a7367

java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclosure.ql

java/ql/src/Security/CWE/CWE-200/TempDirUtils.qll

Co-authored-by: Chris Smowton <smowton@github.com>

JLLeitschuh · 2022-02-10T13:34:46Z

@smowton I'm happy with this PR as-is

smowton · 2022-02-10T13:52:47Z

There's a real test failure to fix

JLLeitschuh · 2022-02-10T15:41:44Z

@smowton indeed! Fixed that. Thanks!

felicitymay

Thanks for writing help for your query. A few minor comments, but generally looking good 🙂

java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclosure.qhelp

java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclosure.ql

felicitymay · 2022-02-10T16:19:26Z

java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclosure.ql

@@ -0,0 +1,258 @@
+/**
+ * @name Temporary Directory Local information disclosure


I'm wondering if this might be clearer. The query name should be in sentence case.

Suggested change

* @name Temporary Directory Local information disclosure

* @name Local information disclosure in a temporary directory

felicitymay · 2022-02-10T16:20:41Z

java/ql/src/change-notes/2022-02-04-local-temp-file-or-directory-information-disclosure.md

+---
+category: newQuery
+---
+* A new query titled "Temporary directory Local information disclosure" (`java/local-temp-file-or-directory-information-disclosure`) has been added.


If we change the name of the query, we'd also need to update it here.

java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclosure.qhelp

Co-authored-by: Felicity Chapman <felicitymay@github.com>

JLLeitschuh · 2022-02-14T21:57:43Z

Amazing! Very happy this is finally merged. Only took me ~1.3 years to get it finished 😆

Follow-up that adds OS specific guards: #8032

github-actions bot added the Java label Oct 2, 2020

JLLeitschuh mentioned this pull request Oct 2, 2020

CVE-2020-8908: Files::createTempDir local information disclosure vulnerability google/guava#4011

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JLLeitschuh force-pushed the feat/JLL/java/CWE-200_temp_directory_local_information_disclosure branch from 7cdf997 to d53d77c Compare October 2, 2020 18:53

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Java: Track taint through java.io.File constructor and #toURI; URI#toURL #4457

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JLLeitschuh force-pushed the feat/JLL/java/CWE-200_temp_directory_local_information_disclosure branch from 1b216f8 to b1aeb99 Compare December 8, 2020 20:42

JLLeitschuh mentioned this pull request Jan 2, 2021

Add MethodAccessSystemGetProperty predicate #4898

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smowton self-assigned this Jan 4, 2021

JLLeitschuh force-pushed the feat/JLL/java/CWE-200_temp_directory_local_information_disclosure branch from e53cfd8 to 6deb3d8 Compare January 23, 2021 17:49

github-actions bot added the documentation label Jan 23, 2021

JLLeitschuh marked this pull request as ready for review January 25, 2021 14:56

JLLeitschuh requested review from felicitymay and a team as code owners January 25, 2021 14:56

smowton assigned aibaars and unassigned smowton Jan 27, 2021

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aschackmull previously approved these changes Feb 8, 2022

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Fix test requirements, formatting

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smowton dismissed stale reviews from aschackmull and themself via a6596ea February 8, 2022 12:02

Consider calls to setReadable(false, false) then setReadable(true, tr…

7f46640

…ue) to be safe

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JLLeitschuh and others added 2 commits February 9, 2022 10:07

Update java/ql/src/Security/CWE/CWE-200/TempDirLocalInformationDisclo…

787e3da

…sure.ql Co-authored-by: Chris Smowton <smowton@github.com>

Fix FP from mkdirs call on exact temp directory

49a7367

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felicitymay added the ready-for-doc-review This PR requires and is ready for review from the GitHub docs team. label Feb 10, 2022

Fix test failure for TempDirLocalInformationDisclosure

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JLLeitschuh and others added 4 commits February 14, 2022 11:00

Fix implicit 'this' usage

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Java: CWE-200: Temp directory local information disclosure vulnerability #4388

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JLLeitschuh commented Feb 14, 2022

		@@ -0,0 +1,258 @@
		/**
		* @name Temporary Directory Local information disclosure

	* @name Temporary Directory Local information disclosure
	* @name Local information disclosure in a temporary directory

Java: CWE-200: Temp directory local information disclosure vulnerability #4388

Java: CWE-200: Temp directory local information disclosure vulnerability #4388

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