SB2018082909 - Multiple vulnerabilities in Joomla!
Published: August 29, 2018
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Stored cross-site scripting (CVE-ID: CVE-2018-15880)
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:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
The disclosed vulnerability allows a remote attacker to perform stored cross-site scripting (XSS) attacks.
The vulnerability exists in the frontend profile due to inadequate output filtering on the user profile page. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
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) Security restrictions bypass (CVE-ID: CVE-2018-15881)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
The disclosed vulnerability allows a remote attacker to bypass security restrictions.
The vulnerability exists in custom fields due to inadequate checks regarding disabled fields. A remote attacker can supply specially crafted fields, bypass security restrictions and violate ACL in custom fields.
3) Security restrictions bypass (CVE-ID: CVE-2018-15882)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
The disclosed vulnerability allows a remote attacker to bypass security restrictions.
The vulnerability exists due to inadequate checks in the InputFilter class. A remote attacker can use specifically prepared PHAR files to bypass the upload filter.
Remediation
Install update from vendor's website.