| Name | CVE-2024-23184 |
| Description | Having a large number of address headers (From, To, Cc, Bcc, etc.) becomes excessively CPU intensive. With 100k header lines CPU usage is already 12 seconds, and in a production environment we observed 500k header lines taking 18 minutes to parse. Since this can be triggered by external actors sending emails to a victim, this is a security issue. An external attacker can send specially crafted messages that consume target system resources and cause outage. One can implement restrictions on address headers on MTA component preceding Dovecot. No publicly available exploits are known. |
| 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-3860-1, DSA-5752-1 |
| Debian Bugs | 1078876 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| dovecot (PTS) | bullseye | 1:2.3.13+dfsg1-2+deb11u1 | vulnerable |
| bullseye (security) | 1:2.3.13+dfsg1-2+deb11u2 | fixed | |
| bookworm, bookworm (security) | 1:2.3.19.1+dfsg1-2.1+deb12u1 | fixed | |
| sid, trixie | 1:2.3.21.1+dfsg1-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| dovecot | source | stretch | (not affected) | |||
| dovecot | source | buster | (not affected) | |||
| dovecot | source | bullseye | 1:2.3.13+dfsg1-2+deb11u2 | DLA-3860-1 | ||
| dovecot | source | bookworm | 1:2.3.19.1+dfsg1-2.1+deb12u1 | DSA-5752-1 | ||
| dovecot | source | (unstable) | 1:2.3.21.1+dfsg1-1 | 1078876 |
[buster] - dovecot <not-affected> (Vulnerable code not present)
[stretch] - dovecot <not-affected> (Vulnerable code not present)
https://www.openwall.com/lists/oss-security/2024/08/15/3
Fixed by: https://github.com/dovecot/core/commit/8e4c42dbb3c770fcdbc396f2abcf1bc228ec548d (2.3.21.1)
Fixed by: https://github.com/dovecot/core/commit/cee08202c759a3bdf185d998dcf888ebd1bc6e36 (2.3.21.1)
Fixed by: https://github.com/dovecot/core/commit/0bae091859c905dc335f21eed01347e6b8338672 (2.3.21.1)
Fixed by: https://github.com/dovecot/core/commit/a1c9b0409454e45937bf7e9c3685f5e91d6a5a43 (2.3.21.1)
Fixed by: https://github.com/dovecot/core/commit/da61d20311da34f22944c6111a0b97ea2a1f8a47 (2.3.21.1)
Fixed by: https://github.com/dovecot/core/commit/1481c04f02df7647f520df65d63df7626bf0ee32 (2.3.21.1)
Introduced by: https://github.com/dovecot/core/commit/469fcd3bdd7df40bb8f4d131121f3bfbceade02a (2.3.10)