5.0 MEDIUM
- CVSS version: 3.1
- Attack vector (AV): LOCAL
- Attack complexity (AC): LOW
- Privileges required (PR): LOW
- User interaction (UI): REQUIRED
- Scope (S): UNCHANGED
- Confidentiality impact (C): NONE
- Integrity impact (I): HIGH
- Availability impact (A): NONE
Activity log
- Created suggestion
uutils coreutils ln Security Bypass via Improper Handling of the --no-dereference Flag
A logic error in the ln utility of uutils coreutils allows the utility to dereference a symbolic link target even when the --no-dereference (or -n) flag is explicitly provided. The implementation previously only honored the "no-dereference" intent if the --force (overwrite) mode was also enabled. This flaw causes ln to follow a symbolic link that points to a directory and create new links inside that target directory instead of treating the symbolic link itself as the destination. In environments where a privileged user or system script uses ln -n to update a symlink, a local attacker could manipulate existing symbolic links to redirect file creation into sensitive directories, potentially leading to unauthorized file creation or system misconfiguration.
References
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https://github.com/uutils/coreutils/releases/tag/0.8.0 vendor-advisory
Affected products
- <0.8.0
Matching in nixpkgs
pkgs.coreutils
GNU Core Utilities
pkgs.coreutils-full
GNU Core Utilities
pkgs.policycoreutils
SELinux policy core utilities
pkgs.uutils-coreutils
Cross-platform Rust rewrite of the GNU coreutils
pkgs.coreutils-prefixed
GNU Core Utilities
pkgs.uutils-coreutils-noprefix
Cross-platform Rust rewrite of the GNU coreutils
pkgs.minimal-bootstrap.coreutils
The GNU Core Utilities
pkgs.selinuxPackages.policycoreutils
SELinux policy core utilities
pkgs.minimal-bootstrap.coreutils-musl
The GNU Core Utilities
pkgs.minimal-bootstrap.coreutils-static
The GNU Core Utilities
Package maintainers
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@dasJ Janne Heß <janne@hess.ooo>
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@mdaniels5757 Michael Daniels <nix@mdaniels.me>
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@infinisil Silvan Mosberger <contact@infinisil.com>
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@pyrox0 Pyrox <pyrox@pyrox.dev>
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@balsoft Alexander Bantyev <balsoft75@gmail.com>
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@siraben Siraphob Phipathananunth <bensiraphob@gmail.com>
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@Gskartwii Aleksi Hannula <ahannula4@gmail.com>
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@06kellyjac Jack <hello+nixpkgs@j-k.io>
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@emilytrau Emily Trau <emily+nix@downunderctf.com>
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@Ericson2314 John Ericson <John.Ericson@Obsidian.Systems>
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@Artturin Artturi N <artturin@artturin.com>
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@alejandrosame Alejandro Sánchez Medina <alejandrosanchzmedina@gmail.com>
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@RossComputerGuy Tristan Ross <tristan.ross@midstall.com>
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@numinit Morgan Jones <me+nixpkgs@numin.it>
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@matthiasbeyer Matthias Beyer <mail@beyermatthias.de>
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@GaetanLepage Gaetan Lepage <gaetan@glepage.com>