#VU12078 Command injection in Roundcube - CVE-2018-9846

Vulnerability identifier: #VU12078

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:U/U:Green]

CVE-ID: CVE-2018-9846

CWE-ID: CWE-77

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Roundcube
Web applications / Webmail solutions

Vendor: Roundcube

Description
The vulnerability allows a remote attacker to execute arbitrary IMAP command.

The vulnerability exists in Roundcube when processing user-supplied data passed via the "_uid" HTTP GET parameter to archive.php script. A remote authenticated attacker can execute arbitrary IMAP command after "%0d%0a" characters.

Successful exploitation of the vulnerability may allow an attacker to gain unauthorized access to email messages of other users.

Mitigation
Update to version 1.1.11, 1.2.8 or 1.3.6.

Vulnerable software versions

Roundcube: 1.1.0 - 1.1.10, 1.2.0 - 1.2.7, 1.3.0 - 1.3.5

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External links
https://roundcube.net/news/2018/04/11/security-update-1.3.6
https://roundcube.net/news/2018/04/17/security-updates-1.2.8-1.1.11

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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?

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