| Package | Affected versions | Patched versions |
|---|---|---|
| phpmailer/phpmailer | ≥ 5.0.0, < 5.2.20 | 5.2.20 |
| joomla! | ≥ 1.5.0, ≤ 3.6.5 | |
| phpmailer | < 5.2.20 | 5.2.20 |
| wordpress | ≤ 4.7 |
The isMail transport in PHPMailer before 5.2.20 might allow remote attackers to pass extra parameters to the mail command and consequently execute arbitrary code by leveraging improper interaction between the escapeshellarg function and internal escaping performed in the mail function in PHP. NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-10033.
This issue really emphasises that it's worth avoiding the built-in PHP mail() function entirely.
Fixed in 5.2.20
Send via SMTP to localhost instead of calling the mail() function.
https://nvd.nist.gov/vuln/detail/CVE-2016-10045 See also https://nvd.nist.gov/vuln/detail/CVE-2016-10033
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