In Roundcube from versions 1.2.0 to 1.3.5, with the archive plugin enabled and configured, it's possible to exploit the unsanitized, user-controlled "_uid" parameter (in an archive.php _task=mail&_mbox=INBOX&_action=plugin.move2archive request) to perform an MX (IMAP) injection attack by placing an IMAP command after a %0d%0a sequence. NOTE: this is less easily exploitable in 1.3.4 and later because of a Same Origin Policy protection mechanism.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - In Roundcube from versions 1.2.0 to 1.3.5, with the archive plugin enabled and configured, it's possible     to exploit the unsanitized, user-controlled _uid parameter (in an archive.php
    _task=mail&_mbox=INBOX&_action=plugin.move2archive request) to perform an MX (IMAP) injection attack by     placing an IMAP command after a %0d%0a sequence. NOTE: this is less easily exploitable in 1.3.4 and later     because of a Same Origin Policy protection mechanism. (CVE-2018-9846)

Note that Nessus relies on the presence of the package as reported by the vendor.

Upstream announcement :

**Version 1.3.6**

This is a security update to the stable version 1.3. It primarily fixes a recently discovered IMAP command injection vulnerability caused by insufficient input validation within the archive plugin.
Details about the vulnerability are published under CVE-2018-9846.

Additionally, we back-ported some minor fixes from the master branch which improve PHP 7.2 compatibility as well as PGP signing and key handling for those who use the Enigma plugin. See the complete changelog below.

We strongly recommend to update all productive installations of Roundcube. Please do backup your data before updating!

**CHANGELOG**

  - Fix parsing date strings (e.g. from a Date: mail header)     with comments (#6216)

  - Fix PHP 7.2: count(): Parameter must be an array in     enchant-based spellchecker (#6234)

  - Fix possible IMAP command injection and type juggling     vulnerabilities (#6229)

  - Enigma: Fix key selection for signing

  - Enigma: Enable keypair generation on Internet Explorer     11

  - Fix check_request() bypass in places using get_uids()     [CVE-2018-9846] (#6238)

  - Fix bug where usernames without domain part could be     malformed or converted to lower-case on logon (#6224)

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Andrea Basile discovered that the 'archive' plugin in roundcube, a skinnable AJAX based webmail solution for IMAP servers, does not properly sanitize a user-controlled parameter, allowing a remote attacker to inject arbitrary IMAP commands and perform malicious actions.

Upstream reports :

This update primarily fixes a recently discovered IMAP-cmd-injection vulnerability caused by insufficient input validation within the archive plugin. Details about the vulnerability are published under CVE-2018-9846.

ID	Name	Product	Family	Severity
256488	Linux Distros Unpatched Vulnerability : CVE-2018-9846	Nessus	Misc.	high
120762	Fedora 28 : roundcubemail (2018-c279b3696f)	Nessus	Fedora Local Security Checks	high
109410	Debian DSA-4181-1 : roundcube - security update	Nessus	Debian Local Security Checks	high
109227	Fedora 26 : roundcubemail (2018-f6dc921a19)	Nessus	Fedora Local Security Checks	high
109222	Fedora 27 : roundcubemail (2018-57fbdb1cb5)	Nessus	Fedora Local Security Checks	high
109052	FreeBSD : roundcube -- IMAP command injection vulnerability (48894ca9-3e6f-11e8-92f0-f0def167eeea)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2018-9846

high

Tenable Plugins

high

high

high

high

high

high