Improper input validation in PHPMailer

1) Input validation error

EUVDB-ID: #VU29531

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

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

CPE2.3

• cpe:2.3:a:phpmailer_sourceforge_net:phpmailer:6.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:phpmailer_sourceforge_net:phpmailer:6.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:phpmailer_sourceforge_net:phpmailer:6.1.2:*:*:*:*:*:*:*

External links

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