Deserialization of Untrusted Data in PHPMailer



Published: 2021-05-04
Risk High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-36326
CWE ID CWE-502
Exploitation vector Network
Public exploit N/A
Vulnerable software
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PHPMailer
Web applications / Other software

Vendor phpmailer.sourceforge.net

Security Advisory

This security advisory describes one high risk vulnerability.

1) Deserialization of Untrusted Data

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-36326

CWE-ID: CWE-502 - Deserialization of Untrusted Data

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insecure input validation when processing serialized data in "addAttachment". A remote attacker can pass specially crafted data to the application and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

PHPMailer: 6.1.8, 6.2.0, 6.3.0, 6.4.0

CPE External links

https://github.com/PHPMailer/PHPMailer/commit/e2e07a355ee8ff36aba21d0242c5950c56e4c6f9
https://github.com/PHPMailer/PHPMailer/commit/26f2848d3bbb57add5f34a467a1e3b2f9ce5cd2a

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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