| Name | CVE-2020-8794 |
| Description | OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mta_io in mta_session.c for multi-line replies. Although this vulnerability affects the client side of OpenSMTPD, it is possible to attack a server because the server code launches the client code during bounce handling. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-4634-1 |
| Debian Bugs | 952453 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| opensmtpd (PTS) | stretch (security), stretch (lts), stretch | 6.0.2p1-2+deb9u3 | fixed |
| buster (security), buster, buster (lts) | 6.0.3p1-5+deb10u4 | fixed | |
| bullseye | 6.8.0p2-3 | fixed | |
| bookworm | 6.8.0p2-4 | fixed | |
| sid, trixie | 7.5.0p0-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| opensmtpd | source | stretch | 6.0.2p1-2+deb9u3 | DSA-4634-1 | ||
| opensmtpd | source | buster | 6.0.3p1-5+deb10u4 | DSA-4634-1 | ||
| opensmtpd | source | (unstable) | 6.6.4p1-1 | 952453 |
https://www.openwall.com/lists/oss-security/2020/02/24/5
https://poolp.org/posts/2020-01-30/opensmtpd-advisory-dissected/
https://www.openwall.com/lists/oss-security/2020/02/26/1