CVE-2020-36326 Object injection in PHPMailer/PHPMailer
Attacker can achieve code execution via Phar deserialization in PHPMailer when using addAttachment with a UNC pathname.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-36326?
CVE-2020-36326 is a critical unsafe deserialization vulnerability in Wordpress Wordpress, published on 28 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
PHPMailer 6.1.8 through 6.4.0 allows object injection through Phar Deserialization via addAttachment with a UNC pathname. NOTE: this is similar to CVE-2018-19296, but arose because 6.1.8 fixed a functionality problem in which UNC pathnames were always considered unreadable by PHPMailer, even in safe contexts. As an unintended side effect, this fix eliminated the code that blocked addAttachment exploitation.
Weakness: CWE-502
Which versions are affected by CVE-2020-36326?
5 open source packages ship an affected version, including wordpress, phpmailer and wordpress-multisite. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
wordpress Bitnami | From 3.7.0 | 3.7.36, 3.8.36, 3.9.34, 4.0.33, 4.1.33, 4.2.30, 4.3.26, 4.4.25, 4.5.24, 4.6.21, 4.7.21, 4.8.17, 4.9.18, 5.0.13, 5.1.10, 5.2.11, 5.3.8, 5.4.6, 5.5.5, 5.6.4, 5.7.2 |
phpmailer Bitnami | From 6.1.8 | 6.4.1 |
wordpress-multisite Bitnami | From 3.7.0 | 3.7.36, 3.8.36, 3.9.34, 4.0.33, 4.1.33, 4.2.30, 4.3.26, 4.4.25, 4.5.24, 4.6.21, 4.7.21, 4.8.17, 4.9.18, 5.0.13, 5.1.10, 5.2.11, 5.3.8, 5.4.6, 5.5.5, 5.6.4, 5.7.2 |
phpmailer/phpmailer Packagist | From 6.1.8 | 6.4.1 |
phpmailer/phpmailer Packagist | From 6.1.8 | 6.4.1 |
Products include Phpmailer Project Phpmailer, Wordpress Wordpress.
How do I fix CVE-2020-36326?
Upgrade wordpress to a fixed version for your release line: 3.7.36, 3.8.36, 3.9.34 or 4.0.33.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2020-36326 being exploited?
There is no known exploitation of CVE-2020-36326 in the wild and no public exploit code.
Other vulnerabilities in Wordpress Wordpress
Sources
Also known as BIT-phpmailer-2020-36326, BIT-wordpress-2020-36326, BIT-wordpress-multisite-2020-36326, DEBIAN-CVE-2020-36326, GHSA-m298-fh5c-jc66.