CVE-2017-16943
Published: 27 November 2017
The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via vectors involving BDAT commands.
Notes
| Author | Note |
|---|---|
| mdeslaur | only affects Exim 4.88 or newer in zesty, the 78_Disable-chunking-BDAT-by-default.patch patch sets chunking_advertise_hosts = by default, which disables the security issue unless the local configurations changed the default value. Probably no code execution in Ubuntu because the exim binary is built with PIE |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
exim4 Launchpad, Ubuntu, Debian |
artful |
Released
(4.89-5ubuntu1.1)
|
| trusty |
Not vulnerable
(4.82-3ubuntu2.3)
|
|
| upstream |
Needs triage
|
|
| xenial |
Not vulnerable
(4.86.2-2ubuntu2.2)
|
|
| zesty |
Released
(4.88-5ubuntu1.2)
|
|
|
Patches: upstream: https://git.exim.org/exim.git/commitdiff/4e6ae6235c68de243b1c2419027472d7659aa2b4 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 9.8 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |