Vulnerability identifier: #VU20015

Vulnerability 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: N/A

CWE-ID: CWE-22

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Joomla!
Web applications / CMS

Vendor: Joomla!

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to incorrect patch against insecure deserialization when executing Phar archives. A remote attacker can use directory traversal sequences to bypass implemented protection mechanisms. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Joomla!: 3.9.3 - 3.9.5

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External links
http://developer.joomla.org/security-centre/781-20190502-core-by-passing-protection-of-phar-stream-wrapper-interceptor.html

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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.