CVE-2023-4759: Improper handling of case insensitive filesystems in Eclipse JGit allows arbitrary file write
First published: Tue Sep 12 2023(Updated: )
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 <a href="https://repo1.maven.org/maven2/org/eclipse/jgit/">https://repo1.maven.org/maven2/org/eclipse/jgit/</a> and repo.eclipse.org <a href="https://repo.eclipse.org/content/repositories/jgit-releases/">https://repo.eclipse.org/content/repositories/jgit-releases/</a> . The JGit maintainers would like to thank RyotaK for finding and reporting this issue. <a href="https://projects.eclipse.org/projects/technology.jgit/releases/6.6.1">https://projects.eclipse.org/projects/technology.jgit/releases/6.6.1</a> <a href="https://git.eclipse.org/c/jgit/jgit.git/commit/?id=9072103f3b3cf64dd12ad2949836ab98f62dabf1">https://git.eclipse.org/c/jgit/jgit.git/commit/?id=9072103f3b3cf64dd12ad2949836ab98f62dabf1</a> <a href="https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/11">https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/11</a>
Credit: emo@eclipse.org emo@eclipse.org emo@eclipse.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Eclipse JGit | >=6.6.0<6.6.1.202309021850 | |
| Eclipse JGit | >=6.7.0<6.7.0.202309050840 | |
| maven/org.eclipse.jgit:org.eclipse.jgit | <5.13.3.202401111512-r | 5.13.3.202401111512-r |
| maven/org.eclipse.jgit:org.eclipse.jgit | >=6.0.0.202111291000-r<=6.6.0.202305301015-r | 6.6.1.202309021850-r |
| Eclipse JGit | <6.6.0.202305301015 | |
| Eclipse JGit | <5.13.3.202401111512-r | |
| Eclipse JGit | >=6.6.0<6.6.0.202305301015 |
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Reference Links
- https://nvd.nist.gov/vuln/detail/CVE-2023-4759
- https://git.eclipse.org/c/jgit/jgit.git/commit/?id=9072103f3b3cf64dd12ad2949836ab98f62dabf1
- https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/11
- https://projects.eclipse.org/projects/technology.jgit/releases/6.6.1
- https://github.com/advisories/GHSA-3p86-9955-h393 (Advisory)
- https://exchange.xforce.ibmcloud.com/vulnerabilities/265872
- https://www.ibm.com/support/pages/node/7114419 (Advisory)
- https://repo1.maven.org/maven2/org/eclipse/jgit/
- https://repo.eclipse.org/content/repositories/jgit-releases/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2239404
- https://access.redhat.com/errata/RHSA-2024:0712
- https://access.redhat.com/errata/RHSA-2024:0710
- https://access.redhat.com/errata/RHSA-2024:0711
- https://access.redhat.com/errata/RHSA-2024:0714
- https://access.redhat.com/errata/RHSA-2024:1193
- https://access.redhat.com/errata/RHSA-2024:1192
- https://access.redhat.com/errata/RHSA-2024:1194
- https://bugzilla.redhat.com/show_bug.cgi?id=2238614
- https://github.com/eclipse-jgit/jgit/issues/30
- https://projects.eclipse.org/projects/technology.jgit/releases/5.13.3
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2023-4759.
What is the severity of CVE-2023-4759?
The severity of CVE-2023-4759 is high with a severity value of 8.8.
Which software versions are affected by CVE-2023-4759?
All versions of Eclipse JGit up to and including 6.6.0 are affected by CVE-2023-4759.
How can the vulnerability CVE-2023-4759 be exploited?
CVE-2023-4759 can be exploited by using a symbolic link present in a specially crafted git repository to write a file to locations outside the working tree when the repository is cloned with JGit to a case-insensitive file system.
Is there a fix available for CVE-2023-4759?
Yes, a fix is available for CVE-2023-4759 in version 6.6.1.202309021850-r of Eclipse JGit.
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