| Name | CVE-2017-16944 |
| Description | The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to cause a denial of service (infinite loop and stack exhaustion) via vectors involving BDAT commands and an improper check for a '.' character signifying the end of the content, related to the bdat_getc function. |
| 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-4053-1 |
| Debian Bugs | 882671 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| exim4 (PTS) | jessie, jessie (lts) | 4.84.2-2+deb8u11 | fixed |
| stretch (security) | 4.89-2+deb9u8 | fixed |
| stretch (lts), stretch | 4.89-2+deb9u11 | fixed |
| buster | 4.92-8+deb10u6 | fixed |
| buster (security) | 4.92-8+deb10u9 | fixed |
| bullseye (security), bullseye | 4.94.2-7+deb11u2 | fixed |
| bookworm (security), bookworm | 4.96-15+deb12u4 | fixed |
| trixie | 4.97-5 | fixed |
| sid | 4.97-8 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| exim4 | source | wheezy | (not affected) | | | |
| exim4 | source | jessie | (not affected) | | | |
| exim4 | source | stretch | 4.89-2+deb9u2 | | DSA-4053-1 | |
| exim4 | source | (unstable) | 4.89-13 | | | 882671 |
Notes
[jessie] - exim4 <not-affected> (ESMTP CHUNKING extension introduced in 4.88)
[wheezy] - exim4 <not-affected> (ESMTP CHUNKING extension introduced in 4.88)
https://bugs.exim.org/show_bug.cgi?id=2201
https://git.exim.org/exim.git/commitdiff/178ecb70987f024f0e775d87c2f8b2cf587dd542
https://lists.exim.org/lurker/message/20171125.034842.d1d75cac.en.html
4.89-10 adds a workaround which disables the affected code by default