Vulnerability identifier: #VU18415

Vulnerability risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11767

CWE-ID: CWE-918

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
phpBB
Web applications / Forum & blogging software

Vendor: phpBB Group

Description

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input within the avatar upload function. A remote attacker can send a specially crafted HTTP request to the affected application and trick it to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

phpBB: 3.0.0 - 3.2.5

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External links
http://www.phpbb.com/community/viewtopic.php?f=14&t=2509941

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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.