SB2017011601 - Two vulnerabilities in b2evolution
Published: January 16, 2017
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Stored cross-site scripting (CVE-ID: CVE-2017-5494)
CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSSv4: 5.1 [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]
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.
2) Directory traversal (CVE-ID: CVE-2017-5480)
CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSSv4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N]
The vulnerability allows a remote attacker to view arbitrary files on vulnerable system.
The vulnerability exists due to insufficient sanitization of user-supplied data passed "fm_selected" array parameter in "inc/files/files.ctrl.php" script. A remote authenticated attacker can use directory traversal sequences (e.g. ../) to view contents of arbitrary files on vulnerable system.
Successful exploitation of the vulnerability may allow an attacker to obtain sensitive ad system information.
Remediation
Install update from vendor's website.