CVE-2023-4759 (High) detected in org.eclipse.jgit-5.2.0.201812061821-r.jar

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CVE-2023-4759 - High Severity Vulnerability

Vulnerable Library - org.eclipse.jgit-5.2.0.201812061821-r.jar

Repository access and algorithms

Library home page: http://www.eclipse.org/jgit

Path to dependency file: /runtime/v1/project-model/pom.xml

Path to vulnerable library: /runtime/v1/project-model/pom.xml,/docker-images/agent/pom.xml,/runtime/v1/impl/pom.xml,/runtime/loader/pom.xml,/it/common/pom.xml,/repository/pom.xml,/runtime/v2/runner/pom.xml,/policy-engine/pom.xml,/server/queue-client/pom.xml,/server/impl/pom.xml,/runtime/v2/model/pom.xml,/server/dist/pom.xml,/runtime/v2/sdk/pom.xml,/imports/pom.xml,/cli/pom.xml

Dependency Hierarchy:

• ❌ org.eclipse.jgit-5.2.0.201812061821-r.jar (Vulnerable Library)

Found in base branch: master

Vulnerability Details

Arbitrary File Overwrite in Eclipse JGit <= 6.6.0

In Eclipse JGit, all versions <= 6.6.0.202305301015-r, a symbolic link present in a specially crafted git repository can be used to write a file to locations outside the working tree when this repository is cloned with JGit to a case-insensitive filesystem, or when a checkout from a clone of such a repository is performed on a case-insensitive filesystem.

This can happen on checkout (DirCacheCheckout), merge (ResolveMerger via its WorkingTreeUpdater), pull (PullCommand using merge), and when applying a patch (PatchApplier). This can be exploited for remote code execution (RCE), for instance if the file written outside the working tree is a git filter that gets executed on a subsequent git command.

The issue occurs only on case-insensitive filesystems, like the default filesystems on Windows and macOS. The user performing the clone or checkout must have the rights to create symbolic links for the problem to occur, and symbolic links must be enabled in the git configuration.

Setting git configuration option core.symlinks = false before checking out avoids the problem.

The issue was fixed in Eclipse JGit version 6.6.1.202309021850-r and 6.7.0.202309050840-r, available via Maven Central https://repo1.maven.org/maven2/org/eclipse/jgit/  and repo.eclipse.org https://repo.eclipse.org/content/repositories/jgit-releases/ . A backport is available in 5.13.3 starting from 5.13.3.202401111512-r.

The JGit maintainers would like to thank RyotaK for finding and reporting this issue.

Publish Date: 2023-09-12

URL: CVE-2023-4759

CVSS 3 Score Details (8.8)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: High
  • Integrity Impact: High
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-3p86-9955-h393

Release Date: 2023-09-12

Fix Resolution: 5.13.3.202401111512-r

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⛑️ Automatic Remediation will be attempted for this issue.

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✔️ This issue was automatically closed by Mend because the vulnerable library in the specific branch(es) was either marked as ignored or it is no longer part of the Mend inventory.

[mend-for-github-com]

ℹ️ This issue was automatically re-opened by Mend because the vulnerable library in the specific branch(es) has been detected in the Mend inventory.