CVE-2017-16943 : The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to execute arbitr

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.

Published 2017-11-25 17:29:00

Updated 2021-05-04 18:15:08

Source MITRE

View at NVD, CVE.org

Vulnerability category: Memory CorruptionExecute codeDenial of service

Threat overview for CVE-2017-16943

Top countries where our scanners detected CVE-2017-16943

Top open port discovered on systems with this issue 80

IPs affected by CVE-2017-16943 7,874

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2017-16943!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2017-16943

Probability of exploitation activity in the next 30 days: 52.70%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 97 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2017-16943

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2017-16943

CWE-416 Use After Free

Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2017-16943

https://lists.exim.org/lurker/message/20171125.034842.d1d75cac.en.html

[exim-announce] Critical Exim Security Vulnerability: disable chunking
Mailing List

CVEs referencing this url
http://openwall.com/lists/oss-security/2017/11/25/3

oss-security - Re: RCE in Exim reported
Mailing List

CVEs referencing this url
http://openwall.com/lists/oss-security/2017/11/25/2

oss-security - RCE in Exim reported
Mailing List

CVEs referencing this url
https://bugs.exim.org/show_bug.cgi?id=2199

Bug 2199 – Exim use-after-free vulnerability while reading mail header
Exploit;Issue Tracking
http://www.openwall.com/lists/oss-security/2021/05/04/7

oss-security - 21Nails: Multiple vulnerabilities in Exim

CVEs referencing this url
https://git.exim.org/exim.git/commit/4090d62a4b25782129cc1643596dc2f6e8f63bde

git.exim.org Git - exim.git/commit
Patch
https://www.debian.org/security/2017/dsa-4053

Debian -- Security Information -- DSA-4053-1 exim4
Third Party Advisory

CVEs referencing this url
https://github.com/LetUsFsck/PoC-Exploit-Mirror/tree/master/CVE-2017-16944

PoC-Exploit-Mirror/CVE-2017-16944 at master · LetUsFsck/PoC-Exploit-Mirror · GitHub
Exploit
http://www.securitytracker.com/id/1039872

Exim Use-After-Free Memory Error in SMTP Service Lets Remote Users Execute Arbitrary Code on the Target System - SecurityTracker
Third Party Advisory;VDB Entry
http://openwall.com/lists/oss-security/2017/11/25/1

oss-security - Re: RCE in Exim reported
Mailing List

CVEs referencing this url
https://git.exim.org/exim.git/commitdiff/4e6ae6235c68de243b1c2419027472d7659aa2b4

git.exim.org Git - exim.git/commitdiff
Patch

Products affected by CVE-2017-16943