CVE-2020-15250: Junit TemporaryFolder On Unix-like Systems Does Vulnerability
MODERATECVE-2020-15250 is a MODERATE (CVSS 4.4) temporaryfolder on unix-like systems does vulnerability (CWE-732: Incorrect Permission Assignment for Critical Resource) affecting Junit libraries in the Maven ecosystem. The issue involves temporaryfolder on unix-like systems does not limit access to created files. Remediation is available by upgrading affected packages to version 4.13.1.
CVE-2020-15250 at a Glance
Security Impact
CVSS: 4.4
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N).
How to Fix CVE-2020-15250
To remediate this vulnerability, upgrade all affected Junit dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.1</version>
</dependency>
Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=junit
How to Check if You Are Affected
To determine whether your Java application is affected by CVE-2020-15250, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=junit
Analyze the terminal output to locate any version of Junit in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.13.1), your application is affected.
Note: The mvn dependency:tree -Dincludes=junit command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-732: Incorrect Permission Assignment for Critical Resource, where the product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. In Junit, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2020-15250 Affected Junit Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
junit:junit
|
Maven |
≥ 4.7
< 4.13.1
|
4.13.1
|
References
Frequently Asked Questions
What is CVE-2020-15250?
Which Junit versions are affected?
What version fixes CVE-2020-15250?
Is junit affected?
What is the CVSS score of CVE-2020-15250?
What CWE is associated with CVE-2020-15250?
How can I check Maven dependencies for CVE-2020-15250?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-269g-pwp5-87pp",
"modified" : "2021-10-05T16:04:16Z",
"published" : "2020-10-12T17:33:00Z",
"aliases" : [ "CVE-2020-15250" ],
"summary" : "TemporaryFolder on unix-like systems does not limit access to created files",
"details" : "### Vulnerability\n\nThe JUnit4 test rule [TemporaryFolder](https://junit.org/junit4/javadoc/4.13/org/junit/rules/TemporaryFolder.html) contains a local information disclosure vulnerability.\n\nExample of vulnerable code:\n```java\npublic static class HasTempFolder {\n @Rule\n public TemporaryFolder folder = new TemporaryFolder();\n\n @Test\n public void testUsingTempFolder() throws IOException {\n folder.getRoot(); // Previous file permissions: `drwxr-xr-x`; After fix:`drwx------`\n File createdFile= folder.newFile(\"myfile.txt\"); // unchanged/irrelevant file permissions\n File createdFolder= folder.newFolder(\"subfolder\"); // unchanged/irrelevant file permissions\n // ...\n }\n}\n```\n\n### Impact\n\nOn Unix like systems, the system's temporary directory is shared between all users on that system. Because of this, when files and directories are written into this directory they are, by default, readable by other users on that same system.\n\nThis vulnerability **does not** allow other users to overwrite the contents of these directories or files. This is purely an information disclosure vulnerability.\n\nWhen analyzing the impact of this vulnerability, here are the important questions to ask:\n\n1. Do the JUnit tests write sensitive information, like API keys or passwords, into the temporary folder?\n - If yes, this vulnerability impacts you, but only if you also answer 'yes' to question 2.\n - If no, this vulnerability does not impact you.\n2. Do the JUnit tests ever execute in an environment where the OS has other untrusted users. \n _This may apply in CI/CD environments but normally won't be 'yes' for personal developer machines._\n - If yes, and you answered 'yes' to question 1, this vulnerability impacts you.\n - If no, this vulnerability does not impact you.\n\n### Patches\n\nBecause certain JDK file system APIs were only added in JDK 1.7, this this fix is dependent upon the version of the JDK you are using.\n - Java 1.7 and higher users: this vulnerability is fixed in 4.13.1.\n - Java 1.6 and lower users: **no patch is available, you must use the workaround below.**\n\n### Workarounds\n\nIf you are unable to patch, or are stuck running on Java 1.6, specifying the `java.io.tmpdir` system environment variable to a directory that is exclusively owned by the executing user will fix this vulnerability.\n\n### References\n- [CWE-200: Exposure of Sensitive Information to an Unauthorized Actor](https://cwe.mitre.org/data/definitions/200.html)\n- Fix commit https://github.com/junit-team/junit4/commit/610155b8c22138329f0723eec22521627dbc52ae\n\n#### Similar Vulnerabilities\n - Google Guava - https://github.com/google/guava/issues/4011\n - Apache Ant - https://nvd.nist.gov/vuln/detail/CVE-2020-1945\n - JetBrains Kotlin Compiler - https://nvd.nist.gov/vuln/detail/CVE-2020-15824\n\n### For more information\nIf you have any questions or comments about this advisory, please pen an issue in [junit-team/junit4](https://github.com/junit-team/junit4/issues).",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N"
} ],
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},
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"severity" : "MODERATE",
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