Amazon Linux AMI update for postfix

Published: 2024-02-06 | Updated: 2024-03-22

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	Amazon Linux AMI Operating systems & Components / Operating system postfix Operating systems & Components / Operating system package or component
Vendor	Amazon Web Services

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

Update the affected packages:

i686:
    postfix-debuginfo-2.6.6-2.17.amzn1.i686
    postfix-2.6.6-2.17.amzn1.i686
    postfix-perl-scripts-2.6.6-2.17.amzn1.i686

src:
    postfix-2.6.6-2.17.amzn1.src

x86_64:
    postfix-2.6.6-2.17.amzn1.x86_64
    postfix-debuginfo-2.6.6-2.17.amzn1.x86_64
    postfix-perl-scripts-2.6.6-2.17.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

postfix: before 2.6.6-2.17

External links

http://alas.aws.amazon.com/ALAS-2024-1914.html

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. However, proof of concept for this vulnerability is available.