Weakness (CWE)
CWE-61: UNIX Symbolic Link (Symlink) Following
The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.
How to prevent it (2 mitigations)
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Implementation
Symbolic link attacks often occur when a program creates a tmp directory that stores files/links. Access to the directory should be restricted to the program as to prevent attackers from manipulating the files.
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Architecture and Design
Follow the principle of least privilege when assigning access rights to entities in a software system.
Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
Source: MITRE CWE-61
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Critical 9.4
Import Symlink Following Remote Code Execution Vulnerability in QuMagie
An unix symbolic link (symlink) following vulnerability has been reported to affect QuMagie. If a remote attacker gains a user account, they can then exploit the vulnerability to compromise the security of the system. We have already fixed the vulnerability i…
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Critical 9.9
Incus vulnerable to root RCE via image backup.yaml symlink
Incus is a system container and virtual machine manager. Prior to version 7.3.0, an unprivileged, project-confined Incus user (a non-admin TLS/RBAC identity with `can_create_images` and `can_create_instances`) can execute arbitrary code as root on the host. A…
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Critical 9.0
Gogs: UploadRepoFiles writes outside repo working tree via committed parent sym
Gogs is an open source self-hosted Git service. Prior to 0.14.3, (*Repository).UploadRepoFiles checks for symlinks only on the leaf of the upload target (osx.IsSymlink(targetPath)). The siblings UpdateRepoFile, DeleteRepoFile, and GetDiffPreview use hasSymlin…
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Critical 9.6
Langflow: BaseFileComponent-based nodes arbitrary file read with RCE exploit
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.2, by controlling a files that are digested into the RAG, an attacker can direct the node to read any file on the file-system by absolute path. All components based on…
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Critical 9.0
Nix sandbox escape: file write via symlink at FOD `.tmp` copy destination
Nix is a package manager for Linux and other Unix systems. A bug in the fix for CVE-2024-27297 allowed for arbitrary overwrites of files writable by the Nix process orchestrating the builds (typically the Nix daemon running as root in multi-user installations…
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Critical 9.3
Flatpak has a complete sandbox escape leading to host file access and code execution in the host context
Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the Flatpak portal accepts paths in the sandbox-expose options which can be app-controlled symlinks pointing at arbitrary paths. Flatpak run mounts the resolved host path i…
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Critical 9.5CVE-2025-68937 Public exploit
Forgejo before 13.0.2 allows attackers to write to unintended files, and possibly obtain server shell access, because o…
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Critical 9.8
daily-backup.sh script in cyrus-imapd allows escalation from cyrus to root
A UNIX Symbolic Link (Symlink) Following vulnerability in openSUSE Tumbleweed cyrus-imapd allows escalation from cyrus to root.This issue affects openSUSE Tumbleweed cyrus-imapd before 3.8.4-2.1.
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Critical 9.8
readline.sh in socat before1.8.0.2 relies on the /tmp/$USER/stderr2 file.
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Critical 10.0CVE-2024-28189 Public exploit
Judge0 vulnerable to Sandbox Escape Patch Bypass via chown running on Symbolic Link
Judge0 is an open-source online code execution system. The application uses the UNIX chown command on an untrusted file within the sandbox. An attacker can abuse this by creating a symbolic link (symlink) to a file outside the sandbox, allowing the attacker t…
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Critical 10.0CVE-2024-28185 Public exploit
Judge0 vulnerable to Sandbox Escape via Symbolic Link
Judge0 is an open-source online code execution system. The application does not account for symlinks placed inside the sandbox directory, which can be leveraged by an attacker to write to arbitrary files and gain code execution outside of the sandbox. When ex…