id: CVE-2021-38751
info:
name: ExponentCMS <= 2.6 - Host Header Injection
author: dwisiswant0
severity: medium
description: An HTTP Host header attack exists in ExponentCMS 2.6 and below in /exponent_constants.php. A modified HTTP header can change links on the webpage to an arbitrary value,leading to a possible attack vector for MITM.
remediation: |
Upgrade ExponentCMS to a version higher than 2.6 or apply the provided patch to fix the Host Header Injection vulnerability.
reference:
- https://nvd.nist.gov/vuln/detail/CVE-2021-38751
- https://github.com/exponentcms/exponent-cms/issues/1544
- https://github.com/exponentcms/exponent-cms/blob/a9fa9358c5e8dc2ce7ad61d7d5bea38505b8515c/exponent_constants.php#L56-L64
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
cvss-score: 4.3
cve-id: CVE-2021-38751
cwe-id: CWE-116
epss-score: 0.00242
epss-percentile: 0.6141
cpe: cpe:2.3:a:exponentcms:exponentcms:*:*:*:*:*:*:*:*
metadata:
max-request: 1
vendor: exponentcms
product: exponentcms
tags: cve,cve2021,exponentcms
http:
- method: GET
path:
- "{{BaseURL}}"
headers:
Host: '{{randstr}}.tld'
matchers-condition: and
matchers:
- type: word
part: body
words:
- '{{randstr}}.tld'
- 'EXPONENT.PATH'
- 'EXPONENT.URL'
condition: and
- type: status
status:
- 200
