Command Injection in Exim - CVE-2023-51766

Vulnerability identifier: #VU84728

CSH Severity: Medium

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2023-51766

CWE-ID: CWE-77

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vendor: Exim

Affected software:
Exim

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.

Install update from vendor's website.

• https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
• https://exim.org/static/doc/security/CVE-2023-51766.txt
• https://bugs.exim.org/show_bug.cgi?id=3063
• https://www.openwall.com/lists/oss-security/2023/12/23/2
• http://www.openwall.com/lists/oss-security/2023/12/24/1