CVE-2023-51765 Security feature bypass in n/a
Remote attackers can bypass SPF protection by injecting emails with spoofed sender addresses due to SMTP smuggling in specific sendmail configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-51765?
CVE-2023-51765 is a medium-severity vulnerability in Freebsd Freebsd, published on 24 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
sendmail through 8.17.2 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because sendmail supports <LF>.<CR><LF> but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
Weakness: CWE-345
Which versions are affected by CVE-2023-51765?
It affects 3 products.
Linux distribution packages (4)
sendmail SUSE:Linux Enterprise Module for Basesystem 15 SP5 | All versions | 8.15.2-150000.8.12.1 |
sendmail SUSE:Linux Enterprise Module for Legacy 12 | All versions | 8.14.9-4.9.1 |
sendmail SUSE:Linux Enterprise Module for Package Hub 15 SP5 | All versions | 8.15.2-150000.8.12.1 |
sendmail openSUSE:Leap 15.5 | All versions | 8.15.2-150000.8.12.1 |
Products include Freebsd Freebsd, Redhat Enterprise Linux, Sendmail Sendmail.
How do I fix CVE-2023-51765?
Upgrade to a fixed version.
Is CVE-2023-51765 being exploited?
There is no known exploitation of CVE-2023-51765 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as AZL-32295, DEBIAN-CVE-2023-51765, DLA-3829-1, GHSA-5rcq-25vc-g8qr, MGASA-2024-0270, SUSE-SU-2024:0742-1 and 3 more.