CVE-2021-3603
Published: 17 June 2021
PHPMailer 6.4.1 and earlier contain a vulnerability that can result in untrusted code being called (if such code is injected into the host project's scope by other means). If the $patternselect parameter to validateAddress() is set to 'php' (the default, defined by PHPMailer::$validator), and the global namespace contains a function called php, it will be called in preference to the built-in validator of the same name. Mitigated in PHPMailer 6.5.0 by denying the use of simple strings as validator function names.
Notes
| Author | Note |
|---|---|
| ccdm94 | the vulnerable code section seems to have been introduced by commit 77c0bc8d (v.5.2.15). For this reason, bionic and earlier are not vulnerable. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
libphp-phpmailer Launchpad, Ubuntu, Debian |
trusty |
Does not exist
|
| bionic |
Not vulnerable
(code not present)
|
|
| groovy |
Ignored
(end of life)
|
|
| upstream |
Released
(6.5.0)
|
|
| hirsute |
Ignored
(end of life)
|
|
| impish |
Ignored
(end of life)
|
|
| kinetic |
Not vulnerable
(6.6.3-1)
|
|
| xenial |
Not vulnerable
(code not present)
|
|
| lunar |
Not vulnerable
(6.6.3-1)
|
|
| focal |
Released
(6.0.6-0.1ubuntu0.1~esm1)
Available with Ubuntu Pro |
|
| jammy |
Released
(6.2.0-2ubuntu0.1~esm1)
Available with Ubuntu Pro |
|
|
Patches: upstream: https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.1 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3603
- https://www.huntr.dev/bounties/1-PHPMailer/PHPMailer/
- https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3 (v6.5.0)
- https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3
- https://ubuntu.com/security/notices/USN-5956-1
- NVD
- Launchpad
- Debian