CVE-2017-16943
critical
CVSS v3
9.8
CVSS v2
7.5
VIR risk
9.8
Description
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.
Predictions
Exploit likelihood
97%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2017-16943
Vendor advisory: cve@mitre.org — https://git.exim.org/exim.git/commitdiff/4e6ae6235c68de243b1c2419027472d7659aa2b4
Vendor advisory: cve@mitre.org — https://git.exim.org/exim.git/commit/4090d62a4b25782129cc1643596dc2f6e8f63bde
Vendor advisory: arch — https://security.archlinux.org/ASA-201711-32
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 4.89.1-1 | |
| debian | bookworm | fixed | 4.89-12 |
| debian | bullseye | fixed | 4.89-12 |
| debian | forky | fixed | 4.89-12 |
| debian | sid | fixed | 4.89-12 |
| debian | trixie | fixed | 4.89-12 |
| debian | 9.0 | affected | |
References
- https://security.archlinux.org/ASA-201711-32
- http://openwall.com/lists/oss-security/2017/11/25/1
- http://openwall.com/lists/oss-security/2017/11/25/2
- http://openwall.com/lists/oss-security/2017/11/25/3
- http://www.openwall.com/lists/oss-security/2021/05/04/7
- http://www.securitytracker.com/id/1039872
- https://bugs.exim.org/show_bug.cgi?id=2199
- https://git.exim.org/exim.git/commit/4090d62a4b25782129cc1643596dc2f6e8f63bde
- https://git.exim.org/exim.git/commitdiff/4e6ae6235c68de243b1c2419027472d7659aa2b4
- https://github.com/LetUsFsck/PoC-Exploit-Mirror/tree/master/CVE-2017-16944
- https://lists.exim.org/lurker/message/20171125.034842.d1d75cac.en.html
- https://www.debian.org/security/2017/dsa-4053
- https://security-tracker.debian.org/tracker/CVE-2017-16943
CWEs
CWE-416
Verify integrity in audit chain (admin only). AS-IS.