| Name | CVE-2023-51765 |
| 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3829-1, ELA-1124-1 |
| Debian Bugs | 1059386 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| sendmail (PTS) | jessie | 8.14.4-8+deb8u2 | vulnerable |
| stretch (lts), stretch | 8.15.2-8+deb9u2 | fixed | |
| buster (security), buster, buster (lts) | 8.15.2-14~deb10u3 | fixed | |
| bullseye | 8.15.2-22+deb11u3 | fixed | |
| bookworm | 8.17.1.9-2+deb12u2 | fixed | |
| sid, trixie | 8.18.1-6 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| sendmail | source | jessie | (unfixed) | end-of-life | ||
| sendmail | source | stretch | 8.15.2-8+deb9u2 | ELA-1124-1 | ||
| sendmail | source | buster | 8.15.2-14~deb10u2 | DLA-3829-1 | ||
| sendmail | source | bullseye | 8.15.2-22+deb11u1 | |||
| sendmail | source | bookworm | 8.17.1.9-2+deb12u1 | |||
| sendmail | source | (unstable) | 8.18.1-1 | 1059386 |
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
https://www.openwall.com/lists/oss-security/2023/12/21/6
https://www.openwall.com/lists/oss-security/2023/12/26/5