Local file disclosure in PHPMailer
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. ### Impact Arbitrary local files can be attached to email messages. ### Patches Fixed in 5.2.22 ### Workarounds Validate input before using user-supplied file paths. ### References https://nvd.nist.gov/vuln/detail/CVE-2017-5223 ### For more information If you have any questions or comments about this advisory: * Open a private issue in [the PHPMailer project](https://github.com/PHPMailer/PHPMailer)
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2017-5223US | medium5.5 | Exploit | ||
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 tr… | ||||
references
External citations — patches, advisories, analysis.
- http://kalilinux.co/2017/01/12/phpmailer-cve-2017-5223-local-information-disclosure-vulnerability-analysisWEB
- http://www.securityfocus.com/bid/95328WEB
- https://github.com/FriendsOfPHP/security-advisories/blob/master/phpmailer/phpmailer/CVE-2017-5223.yamlWEB
- https://github.com/PHPMailer/PHPMailer/blob/master/SECURITY.mdWEB
- https://github.com/PHPMailer/PHPMailer/releases/tag/v5.2.22WEB
- https://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-4x5h-cr29-fhp6WEB
- https://nvd.nist.gov/vuln/detail/CVE-2017-5223ADVISORY
- https://www.exploit-db.com/exploits/43056WEB
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