SMTP smuggling attack in Postfix



Published: 2023-12-24 | Updated: 2024-10-09
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-51764
CWE-ID CWE-77
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Subscribe 		Postfix
Server applications / Mail servers

Vendor Postfix.org

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Command Injection

EUVDB-ID: #VU84727

Risk: Medium

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2023-51764

CWE-ID: CWE-77 - Command injection

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to spoof email messages.

The vulnerability exists due to an error when handling line endings other than <CR><LF>. A remote attacker can spoof contents of email message and bypass SPF protection mechanism.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Postfix: 3.0.0 - 3.8.3

CPE2.3 External links

http://www.postfix.org/smtp-smuggling.html
http://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
http://www.openwall.com/lists/oss-security/2023/12/24/1


Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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