Multiple vulnerabilities in Joomla!

1) PHP file inclusion

EUVDB-ID: #VU13475

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-12712

CWE-ID: CWE-98 - Improper Control of Filename for Include/Require Statement in PHP Program

Exploit availability: No

Description

The vulnerability allows a remote attacker to include and execute arbitrary files on the local system.

The vulnerability exists due to autoload code checks classnames to be valid, using the "class_exists" function in PHP. This function however does not properly validate names in PHP 5.3, which can lead to local file inclusion vulnerability.

Successful exploitation of the vulnerability may allow an attacker to read arbitrary files and under certain circumstances even compromise vulnerable system but requires that Joomla! is using an old version of PHP 5.3.

Mitigation

Update to version 3.8.9.

Vulnerable software versions

Joomla!: 2.5.0 - 3.8.8

External links

http://developer.joomla.org/security-centre.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Cross-site scripting

EUVDB-ID: #VU13477

Risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-12711

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

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 passed as a link of the current language within the language switcher module. 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.

Mitigation

Update to version 3.8.9.

Vulnerable software versions

Joomla!: 1.6.0 - 3.8.8

External links

http://developer.joomla.org/security-centre.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.