Improper input validation in PHPMailer

1) Input validation error

EUVDB-ID: #VU29531

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-13625

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions

The vulnerability exists due to insufficient validation of user-supplied  file attachments with  a double quote character. A remote attacker can pass specially crafted filename to the application and bypass implemented security restrictions.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

PHPMailer: 6.1.0 - 6.1.5

External links

http://github.com/PHPMailer/PHPMailer/releases/tag/v6.1.6
http://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-f7hx-fqxw-rvvj
http://lists.debian.org/debian-lts-announce/2020/06/msg00014.html
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EFM3BZABL6RUHTVMXSC7OFMP4CKWMRPJ/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SMH4TC5XTS3KZVGMSKEPPBZ2XTZCKKCX/

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.