#VU9172 Information disclosure in Roundcube - CVE-2017-16651

Vulnerability identifier: #VU9172

Vulnerability risk: Medium

CVSSv4.0: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Green]

CVE-ID: CVE-2017-16651

CWE-ID: CWE-200

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Roundcube
Web applications / Webmail solutions

Vendor: Roundcube

Description
The vulnerability allows a remote authenticated attacker to obtain potentially sensitive information on the target system.

The weakness exists due to insufficient validation of file-based attachment plugins and _task=settings&_action=upload-display&_from=timezone requests. A remote attacker can modify the login form and submit it with valid credentials (username/password) of an email account, send a specially crafted HTTP request and gain unauthorized access to arbitrary files on the host's filesystem, including configuration files of Roundcube.

Note: the vulnerability is being actively exploited.

Mitigation
Install update from vendor's website (1.1.10, 1.2.7, 1.3.3).

Vulnerable software versions

Roundcube: 1.1.0 - 1.1.9, 1.2.0 - 1.2.6, 1.3.0 - 1.3.2

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External links
https://roundcube.net/news/2017/11/08/security-updates-1.3.3-1.2.7-and-1.1.10

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.