| Name | CVE-2020-35680 |
| Description | smtpd/lka_filter.c in OpenSMTPD before 6.8.0p1, in certain configurations, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted pattern of client activity, because the filter state machine does not properly maintain the I/O channel between the SMTP engine and the filters layer. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 978039 |
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 | vulnerable | |
| 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 | (not affected) | |||
| opensmtpd | source | (unstable) | 6.8.0p2-1 | 978039 |
[buster] - opensmtpd <no-dsa> (Minor issue)
[stretch] - opensmtpd <not-affected> (new filter grammar support added in ec69ed85b6c)
https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1
https://www.mail-archive.com/misc@opensmtpd.org/msg05188.html