CVE-2017-5223

low-risk
Published 2017-01-16

An issue was discovered in PHPMailer before 5.2.22. PHPMailer's msgHTML method applies transformations to an HTML document to make it usable as an email message body. One of the transformations is to convert relative image URLs into attachments using a script-provided base directory. If no base directory is provided, it resolves to /, meaning that relative image URLs get treated as absolute local file paths and added as attachments. To form a remote vulnerability, the msgHTML method must be called, passed an unfiltered, user-supplied HTML document, and must not set a base directory.

Do I need to act?

~
2.9% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
!
1 public exploit available
43056
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Phpmailer Project

References (8)

Exploit http://kalilinux.co/2017/01/12/phpmailer-cve-2017-5223-local-information-disclos...
Third Party Advisory http://www.securityfocus.com/bid/95328
Issue Tracking https://github.com/PHPMailer/PHPMailer/blob/master/SECURITY.md
https://www.exploit-db.com/exploits/43056/
Exploit http://kalilinux.co/2017/01/12/phpmailer-cve-2017-5223-local-information-disclos...
Third Party Advisory http://www.securityfocus.com/bid/95328
Issue Tracking https://github.com/PHPMailer/PHPMailer/blob/master/SECURITY.md
https://www.exploit-db.com/exploits/43056/
29
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 6/34 · Minimal
Exposure 5/34 · Minimal