Zero-day vulnerability in Roundcube

Information disclosure
CVE-2017-16651

Vulnerability details

Advisory: SB2017111007 - Information disclosure in Roundcube

Vulnerable component: Roundcube

CVE-ID: CVE-2017-16651

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:H/RL:O/RC:C

CWE-ID: CWE-200 - Information exposure

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.

Public Exploits:

- Roundcube Webmail 1.2 - File Disclosure [Exploit-DB]

External links:

https://roundcube.net/news/2017/11/08/security-updates-1.3.3-1.2.7-and-1.1.10
https://gist.github.com/thomascube/3ace32074e23fca0e6510e500bd914a1

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.