Stored cross-site scripting in b2evolution - CVE-2017-5494
Published: January 16, 2017 / Updated: January 16, 2017
Vulnerability identifier: #VU4660
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2017-5494
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: b2evolution.net
Affected software:
b2evolution
b2evolution
Detailed vulnerability description
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data when uploading .swf files for avatar and comments. A remote authenticated attacker can upload malicious .swf file, containing arbitrary JavaScript code and execute it in user's browser in context of vulnerable website, when the victim visits a page with uploaded file.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
How to mitigate CVE-2017-5494
Install update from vendor's GIT repository.