Synology-SA-17:13 WordPress

Abstract

CVE-2017-8295 could allow remote attackers to reset a targeted user’s password using the HTTP header.

Severity

Moderate

Affected

• Products
  • WordPress 4.7.3-0134 and before
• Models
  • All Synology models

Description

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.

Mitigation

We are now working on a solution to this vulnerability. For an immediate workaround, please contact us at security@synology.com.

Update Availability

None

References
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8295
https://exploitbox.io/vuln/WordPress-Exploit-4-7-Unauth-Password-Reset-0day-CVE-2017-8295.html
http://www.freebuf.com/vuls/133816.html
https://www.exploit-db.com/exploits/41963/