Vulnerability CVE-2016-9920
Published: 2016-12-08

Description:
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.

CVSS2 => (AV:N/AC:M/Au:S/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6/10
6.4/10
6.8/10
Exploit range
Attack complexity
Authentication
Remote
Medium
Single time
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Roundcube -> Webmail 

 References:
http://www.openwall.com/lists/oss-security/2016/12/08/10
http://www.securityfocus.com/bid/94858
https://blog.ripstech.com/2016/roundcube-command-execution-via-email/
https://roundcube.net/news/2016/11/28/updates-1.2.3-and-1.1.7-released
https://security.gentoo.org/glsa/201612-44
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