SB2017112913 - Multiple vulnerabilities in WordPress
Published: November 29, 2017
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 vulnerabilities.
1) Insufficient randomization (CVE-ID: CVE-2017-17091)
CWE-ID: CWE-330 - Use of Insufficiently Random Values
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to bypass certain security restrictions.
The vulnerability exists in wp-admin/user-new.php script due to usage of a determinate substring in newbloguser key, which can be directly derived from the user ID. A remote attacker can guess the key and bypass intended access restrictions.
2) Cross-site scripting (CVE-ID: CVE-2017-17093)
CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to perform XSS attacks.
The vulnerability exists due to insufficient sanitization of the language attributes used on
html elements in wp-includes/general-template.php script. A remote attacker can bypass implemented filters and execute arbitrary HTML and script code in victims browser in context of the vulnerable website. 3) Cross-site scripting (CVE-ID: CVE-2017-17094)
CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to perform XSS attacks.
The vulnerability exists due to insufficient sanitization of the attributes of enclosures in RSS and Atom feeds within wp-includes/feed.php script. A remote attacker can bypass implemented filters and execute arbitrary HTML and script code in victims browser in context of the vulnerable website.
4) Improper access control (CVE-ID: CVE-2017-17092)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to upload JavaScript files.
The vulnerability exists due to incorrectly implemented access restrictions in wp-includes/functions.php script, which allowed uploading of JavaScript files for users without unfiltered_html permissions. A remote authenticated attacker can upload malicious JavaScript file and perform XSS or spoofing attacks against website users.
Remediation
Install update from vendor's website.