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GSA_kwCzR0hTQS02aDNtLTM2dzgtaHY2OM0xNA

High EPSS: 0.00931% (0.75117 Percentile) EPSS:
Permalink JSON

Arbitrary file write in nats-server

Affected Packages Affected Versions Fixed Versions
go:github.com/nats-io/nats-streaming-server >= 0.15.0, < 0.24.3 0.24.3
4,332 Dependent packages
1,520 Dependent repositories

Affected Version Ranges

All affected versions

0.15.0, 0.15.1, 0.16.0, 0.16.2, 0.17.0, 0.18.0, 0.19.0, 0.20.0, 0.21.0, 0.21.1, 0.21.2, 0.22.0, 0.22.1, 0.23.0, 0.23.1, 0.23.2, 0.24.0, 0.24.1, 0.24.2

All unaffected versions

0.1.0, 0.2.0, 0.2.2, 0.3.0, 0.3.4, 0.3.6, 0.3.8, 0.4.0, 0.5.0, 0.6.0, 0.7.0, 0.7.2, 0.9.0, 0.9.2, 0.10.0, 0.10.2, 0.11.0, 0.11.2, 0.12.0, 0.12.2, 0.14.0, 0.14.1, 0.14.2, 0.14.3, 0.24.3, 0.24.4, 0.24.5, 0.24.6, 0.25.0, 0.25.1, 0.25.2, 0.25.3, 0.25.4, 0.25.5, 0.25.6
go:github.com/nats-io/nats-server/v2 >= 2.2.0, < 2.7.4 2.7.4
6,417 Dependent packages
24,884 Dependent repositories

Affected Version Ranges

All affected versions

2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5, 2.2.6, 2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.4.0, 2.5.0, 2.6.0, 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.6.5, 2.6.6, 2.7.0, 2.7.1, 2.7.2, 2.7.3

All unaffected versions

2.0.0, 2.0.2, 2.0.4, 2.1.0, 2.1.2, 2.1.4, 2.1.6, 2.1.7, 2.1.8, 2.1.9, 2.7.4, 2.8.0, 2.8.1, 2.8.2, 2.8.3, 2.8.4, 2.9.0, 2.9.1, 2.9.2, 2.9.3, 2.9.4, 2.9.5, 2.9.6, 2.9.7, 2.9.8, 2.9.9, 2.9.10, 2.9.11, 2.9.12, 2.9.14, 2.9.15, 2.9.16, 2.9.17, 2.9.18, 2.9.19, 2.9.20, 2.9.21, 2.9.22, 2.9.23, 2.9.24, 2.9.25, 2.10.0, 2.10.1, 2.10.2, 2.10.3, 2.10.4, 2.10.5, 2.10.6, 2.10.7, 2.10.8, 2.10.9, 2.10.10, 2.10.11, 2.10.12, 2.10.14, 2.10.15, 2.10.16, 2.10.17, 2.10.18, 2.10.19, 2.10.20, 2.10.21, 2.10.22, 2.10.23, 2.10.24, 2.10.25, 2.10.26, 2.10.27, 2.10.28, 2.10.29, 2.11.0, 2.11.1, 2.11.2, 2.11.3, 2.11.4, 2.11.5, 2.11.6

(This document is canonically: https://advisories.nats.io/CVE/CVE-2022-26652.txt)

Background

NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.

JetStream is the optional RAFT-based resilient persistent feature of NATS.

Problem Description

The JetStream streams can be backed up and restored via NATS. The backup format is a tar archive file. Inadequate checks on the filenames within the archive file permit a so-called "Zip Slip" attack in the stream restore.

NATS nats-server through 2022-03-09 (fixed in release 2.7.4) did not correctly sanitize elements of the archive file, thus a user of NATS
could cause the NATS server to write arbitrary content to an attacker-controlled filename.

Affected versions

NATS Server:

  • 2.2.0 up to and including 2.7.3.
    • Introduced with JetStream Restore functionality
  • Fixed with nats-io/nats-server: 2.7.4
  • Docker image: nats https://hub.docker.com/_/nats
  • NB users of OS package files from our releases: a change in goreleaser defaults, discovered late in the release process, moved the install directory from /usr/local/bin to /usr/bin; we are evaluating the correct solution for subsequent releases, but not recutting this release.

NATS Streaming Server

  • 0.15.0 up to and including 0.24.2
  • Fixed with nats-io/nats-streaming-server: 0.24.3
  • Embeds a nats-server, but this server is the old approach which JetStream replaces, so unlikely (but not impossible) to be
    configured with JS support

Workarounds

  • Disable JetStream for untrusted users.
  • If only one NATS account uses JetStream, such that cross-user attacks are not an issue, and any user in that account with access to the JetStream API is fully trusted anyway, then appropriate sandboxing techniques will prevent exploit.
    • Eg, with systemd, the supplied util/nats-server-hardened.service example configuration demonstrates that NATS runs fine as an unprivileged user under ProtectSystem=strict and PrivateTmp=true restrictions; by only opening a ReadWritePaths hole for the JetStream storage area, the impact of this vulnerability is limited.

Solution

Upgrade the NATS server to at least 2.7.4.

We fully support the util/nats-server-hardened.service configuration for running a NATS server and encourage this approach.

Credits

This issue was reported (on 2022-03-07) to the NATS Maintainers by
Yiming Xiang, TIANJI LAB of NSFOCUS.
Thank you / 谢谢你！

References:

Identifiers

GHSA-6h3m-36w8-hv68

CVE-2022-26652

Risk

Severity

High

EPSS

EPSS Percentage: 0.00931

EPSS Percentile: 0.75117

Classification

General

Source

GitHub Advisory Database

Origin

Unspecified

Repository

https://github.com/nats-io/nats-server

Date and time

Published

over 3 years ago

Updated

over 2 years ago

API

JSON