8.9 HIGH
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Adjacent (A)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): Low (L)
- User Interaction (UI): None (N)
- Scope (S): Changed (C)
- Confidentiality (C): High (H)
- Integrity (I): High (H)
- Availability (A): Low (L)
- Modified Attack Vector (MAV): Adjacent (A)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): Low (L)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): High (H)
- Modified Scope (MS): Changed (C)
- Modified Integrity (MI): High (H)
- Modified Availability (MA): Low (L)
Activity log
- Created suggestion
Ceph: AES-CBC misuse in CephX and RADOSGW enables authentication bypass and credential forgery
Ceph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the CephX authentication protocol encrypts tickets with AES-128-CBC in an unauthenticated mode that uses a hard-coded initialization vector and no message authentication, allowing an attacker to forge credentials and gain cluster-wide access. Because the ciphertext is malleable and the monitor will encrypt attacker-chosen entity names, an attacker holding one low-privilege key and able to observe CephX traffic can use the monitor as an encryption oracle and splice ciphertext blocks into valid tickets for privileged entities such as Manager, MDS, and OSD. The same lack of authentication also lets an attacker with CephX permissions escalate privileges by flipping a single bit in a service ticket to set its allow_all field to true. This issue is fixed in versions 20.2.4 and 19.2.6.
References
-
https://github.com/ceph/ceph/security/advisories/GHSA-7q3q-3975-qw3q x_refsource_CONFIRM
Affected products
- ==< 19.2.6
- ==>= 20.0.0, < 20.2.4
Matching in nixpkgs
pkgs.ceph
Distributed storage system
pkgs.calceph
C library for interacting with binary planetary ephemeris files, such INPOPxx, JPL DExxx and SPICE
pkgs.libceph
Distributed storage system
pkgs.ceph-csi
Container Storage Interface (CSI) driver for Ceph RBD and CephFS
pkgs.ceph-dev
Distributed storage system
pkgs.ceph-client
Distributed storage system
pkgs.kubectl-rook-ceph
Krew plugin to run kubectl commands with rook-ceph
pkgs.sbclPackages.cephes
None
-
nixos-unstable 20260101-git
- nixpkgs-unstable 20260101-git
- nixos-unstable-small 20260101-git
-
nixos-26.05 20260101-git
- nixos-26.05-small 20260101-git
- nixpkgs-26.05-darwin 20260101-git
Package maintainers
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@kiranshila Kiran Shila <me@kiranshila.com>
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@alexanderkjeldaas Alexander Kjeldaas <ak@formalprivacy.com>
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@johanot Johan Thomsen <write@ownrisk.dk>
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@krav Kristoffer Thømt Ravneberg <kristoffer@microdisko.no>
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@adevress Adrien Devresse <adev@adev.name>
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@benaryorg benaryorg <binary@benary.org>
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@nh2 Niklas Hambüchen <mail@nh2.me>
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@vinylen Victor Nilsson <victor@viclab.se>
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@nagy Daniel Nagy <danielnagy@posteo.de>
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@7c6f434c Michael Raskin <7c6f434c@mail.ru>
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@Uthar Kasper Gałkowski <galkowskikasper@gmail.com>
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@lukego Luke Gorrie <luke@snabb.co>
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@hraban Hraban Luyat <hraban@0brg.net>