Exploitalert - Database of Exploits

Zeta Components Mail 1.8.1 Remote Code Execution

CVE	Category	Price	Severity
CVE-2017-15806	CWE-78	Not specified	High

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2017-11-17

CPE
cpe:cpe:/a:zetacomponents:mail:1.8.1

CVSS	EPSS	EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2017110102

Zeta Components Mail 1.8.1 Remote Code Execution

Vendor: Zeta Components module: Mail, <= 1.8.1 Published: November 12nd, 2017 Reported by: Kay CVE-2017-15806 Overview Zeta Components are a high quality, general purpose library of loosly coupled components for development of applications based on PHP 5. An issue was discovered in the Mail package for Zeta Components. Its possible to exploit this vulnerability to execute arbitrary shell commands on the remote server. Detail This vulnerability is on send method in ezcMailMtaTransport class. In /src/transports/mta/mta_transport.php at line 73, send() method use PHP mail() method to deliver email, while PHP use sendmail as default MTA. When mail() method is called, the 5th parameter is $additionalParameters , this parameter can pass extra param to sendmail. As the code shown, it is assigned by this line: $additionalParameters = "-f{$mail->returnPath->email}; If attacker assign email address like: '[email protected] -X/var/www/html/cache/exploit.php' and inject payload in mail body, sendmail will transfer log(-X) into /var/www/html/cache/exploit.php. The resulting file will contain the payload passed in the body of the email, that can then be accessed and run through domainname/cache/exploit.php. To summary, it is possible if all of these conditions are true: - you use the ezcMailMtaTransport - your sendmail binary allows the -X flag to be set, which is not the case for exim4 and postfix, as they dont support that argument - your wwwroot is writable by the user your webserver is running at the input to use for the ezcMailAddress that is assigned to the returnPath property is not properly escaped PoC use Mail\mail; $mail = new ezcMail(); $mail->returnPath = new ezcMailAddress('[email protected] -X/var/www/html/cache/exploit.php'); $mail->addTo( new ezcMailAddress('some one')); $mail->subject = "Mail PoC Exploit"; $mail->body = new ezcMailText("<?php phpinfo(); ?>"); $transport = new ezcMailMtaTransport(); $transport->send($mail); Remediation Upgrade Mail to 1.8.2

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