steps/mail/sendmail.inc in Roundcube before 1.1.7 and 1.2.x before 1.2.3, when no SMTP server is configured and the sendmail program is enabled, does not properly restrict the use of custom envelope-from addresses on the sendmail command line, which allows remote authenticated users to execute arbitrary code via a modified HTTP request that sends a crafted e-mail message.

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

  - steps/mail/sendmail.inc in Roundcube before 1.1.7 and 1.2.x before 1.2.3, when no SMTP server is     configured and the sendmail program is enabled, does not properly restrict the use of custom envelope-from     addresses on the sendmail command line, which allows remote authenticated users to execute arbitrary code     via a modified HTTP request that sends a crafted e-mail message. (CVE-2016-9920)

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

The remote host is affected by the vulnerability described in GLSA-201612-44 (Roundcube: Arbitrary code execution)

    Roundcube, when no SMTP server is configured and the sendmail program is       enabled, does not properly restrict the use of custom envelope-from       addresses on the sendmail command line.
  Impact :

    An authenticated remote attacker could possibly execute arbitrary code       with the privileges of the process, or cause a Denial of Service       condition.
  Workaround :

    Don&rsquo;t use a MTA (Mail Transfer Agent) in conjunction with Roundcube       which implements sendmail&rsquo;s &ldquo;-O&rdquo; or &ldquo;-X&rdquo; parameter, or       configure Roundcube to use a SMTP server as recommended by upstream.

**Version 1.2.3**

  - Searching in both contacts and groups when LDAP     addressbook with group_filters option is used

  - Fix vulnerability in handling of mail()'s 5th argument

  - Fix To: header encoding in mail sent with mail() method     (#5475)

  - Fix flickering of header topline in min-mode (#5426)

  - Fix bug where folders list would scroll to top when     clicking on subscription checkbox (#5447)

  - Fix decoding of GB2312/GBK text when iconv is not     installed (#5448)

  - Fix regression where creation of default folders wasn't     functioning without prefix (#5460)

  - Enigma: Fix bug where last records on keys list were     hidden (#5461)

  - Enigma: Fix key search with keyword containing non-ascii     characters (#5459)

  - Fix bug where deleting folders with subfolders could     fail in some cases (#5466)

  - Fix bug where IMAP password could be exposed via error     message (#5472)

  - Fix bug where it wasn't possible to store more that 2MB     objects in memcache/apc, Added     memcache_max_allowed_packet and apc_max_allowed_packet     settings (#5452)

  - Fix 'Illegal string offset' warning in rcube::log_bug()     on PHP 7.1 (#5508)

  - Fix storing 'empty' values in     rcube_cache/rcube_cache_shared (#5519)

  - Fix missing content check when image resize fails on     attachment thumbnail generation (#5485)

  - Fix displaying attached images with wrong Content-Type     specified (#5527)

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.

The Roundcube project reports

steps/mail/sendmail.inc in Roundcube before 1.1.7 and 1.2.x before 1.2.3, when no SMTP server is configured and the sendmail program is enabled, does not properly restrict the use of custom envelope-from addresses on the sendmail command line, which allows remote authenticated users to execute arbitrary code via a modified HTTP request that sends a crafted e-mail message.

ID	Name	Product	Family	Severity
254229	Linux Distros Unpatched Vulnerability : CVE-2016-9920	Nessus	Misc.	high
96124	GLSA-201612-44 : Roundcube: Arbitrary code execution	Nessus	Gentoo Local Security Checks	high
95783	Fedora 23 : roundcubemail (2016-b4896f20b3)	Nessus	Fedora Local Security Checks	high
95780	Fedora 24 : roundcubemail (2016-60753c3dcd)	Nessus	Fedora Local Security Checks	high
95688	Fedora 25 : roundcubemail (2016-d361d188d9)	Nessus	Fedora Local Security Checks	high
95393	FreeBSD : Roundcube -- arbitrary command execution (125f5958-b611-11e6-a9a5-b499baebfeaf)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2016-9920

high

Tenable Plugins

high

high

high

high

high

high