CVE-2018-6789
Exim Buffer Overflow Vulnerability - [Actively Exploited]
Description
An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.
INFO
Published Date :
Feb. 8, 2018, 11:29 p.m.
Last Modified :
July 25, 2024, 1:47 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.9
Exploitability Score :
3.9
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
Exim contains a buffer overflow vulnerability in the base64d function part of the SMTP listener that may allow for remote code execution.
Apply updates per vendor instructions.
Public PoC/Exploit Available at Github
CVE-2018-6789 has a 16 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2018-6789
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2018-6789.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Imoro Umar Farouq's report on Internal Network Penetration Testing
Shell
My ctf challenges
Dockerfile Makefile C Shell Python
None
Dockerfile
Exim < 4.90.1 RCE Vulnerability remake for Python3 with arguments passed from CLI
Python
Study Project : Linux 資訊安全檢測與漏洞分析 Linux Information Security Scanning And Vulnerability Assessment
Shell
None
None
Python C Makefile Shell
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
cisa-kev vulnerability 0day cisa exploits
None
None
None
This repository provides a learning environment to understand how an Exim RCE exploit for CVE-2018-6789 works.
exploit exploit-development pwndbg gdb rce exim-exploit exim learning-by-doing educational binary-exploitation pwntools vagrant docker cve
Dockerfile Python Makefile Shell
PoC materials to exploit CVE-2018-6789
Makefile C
None
Python
CVE-2018-6789
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2018-6789 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2018-6789 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
Jul. 25, 2024
Action Type Old Value New Value Removed CVSS V3 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html No Types Assigned http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html Exploit, Third Party Advisory, VDB Entry Changed Reference Type http://www.securityfocus.com/bid/103049 Third Party Advisory, VDB Entry http://www.securityfocus.com/bid/103049 Broken Link, Third Party Advisory, VDB Entry Changed Reference Type http://www.securitytracker.com/id/1040461 Third Party Advisory, VDB Entry http://www.securitytracker.com/id/1040461 Broken Link, Third Party Advisory, VDB Entry Changed Reference Type https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/ Technical Description, Third Party Advisory https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/ Exploit, Third Party Advisory Changed Reference Type https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1 Patch, Vendor Advisory https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1 Patch Changed Reference Type https://www.debian.org/security/2018/dsa-4110 Third Party Advisory https://www.debian.org/security/2018/dsa-4110 Mailing List, Third Party Advisory Removed CWE NIST CWE-119 Added CWE NIST CWE-120 Changed CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:* OR *cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:* -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Jun. 03, 2021
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html [No Types Assigned] -
Modified Analysis by [email protected]
Mar. 06, 2019
Action Type Old Value New Value Changed Reference Type https://usn.ubuntu.com/3565-1/ No Types Assigned https://usn.ubuntu.com/3565-1/ Third Party Advisory Changed Reference Type https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html Third Party Advisory https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html Mailing List, Third Party Advisory Changed Reference Type https://www.exploit-db.com/exploits/45671/ No Types Assigned https://www.exploit-db.com/exploits/45671/ Exploit, Third Party Advisory, VDB Entry Changed Reference Type http://www.securitytracker.com/id/1040461 No Types Assigned http://www.securitytracker.com/id/1040461 Third Party Advisory, VDB Entry Changed Reference Type https://www.exploit-db.com/exploits/44571/ No Types Assigned https://www.exploit-db.com/exploits/44571/ Exploit, Third Party Advisory, VDB Entry Added CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Oct. 26, 2018
Action Type Old Value New Value Added Reference https://www.exploit-db.com/exploits/45671/ [No Types Assigned] -
CVE Modified by [email protected]
May. 05, 2018
Action Type Old Value New Value Added Reference https://www.exploit-db.com/exploits/44571/ [No Types Assigned] -
CVE Modified by [email protected]
Mar. 16, 2018
Action Type Old Value New Value Added Reference https://usn.ubuntu.com/3565-1/ [No Types Assigned] -
CVE Modified by [email protected]
Mar. 12, 2018
Action Type Old Value New Value Added Reference http://www.securitytracker.com/id/1040461 [No Types Assigned] -
Initial Analysis by [email protected]
Mar. 10, 2018
Action Type Old Value New Value Added CVSS V2 (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://exim.org/static/doc/security/CVE-2018-6789.txt No Types Assigned https://exim.org/static/doc/security/CVE-2018-6789.txt Vendor Advisory Changed Reference Type https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/ No Types Assigned https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/ Technical Description, Third Party Advisory Changed Reference Type http://www.openwall.com/lists/oss-security/2018/02/07/2 No Types Assigned http://www.openwall.com/lists/oss-security/2018/02/07/2 Mailing List, Third Party Advisory Changed Reference Type https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1 No Types Assigned https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1 Patch, Vendor Advisory Changed Reference Type http://www.securityfocus.com/bid/103049 No Types Assigned http://www.securityfocus.com/bid/103049 Third Party Advisory, VDB Entry Changed Reference Type https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html No Types Assigned https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html Third Party Advisory Changed Reference Type http://openwall.com/lists/oss-security/2018/02/10/2 No Types Assigned http://openwall.com/lists/oss-security/2018/02/10/2 Mailing List, Third Party Advisory Changed Reference Type https://www.debian.org/security/2018/dsa-4110 No Types Assigned https://www.debian.org/security/2018/dsa-4110 Third Party Advisory Added CWE CWE-119 Added CPE Configuration OR *cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:* versions up to (excluding) 4.90.1 Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Mar. 09, 2018
Action Type Old Value New Value Added Reference https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/ [No Types Assigned] -
CVE Modified by [email protected]
Feb. 18, 2018
Action Type Old Value New Value Added Reference http://www.securityfocus.com/bid/103049 [No Types Assigned] -
CVE Modified by [email protected]
Feb. 12, 2018
Action Type Old Value New Value Changed Description An issue was discovered in the SMTP listener in Exim 4.90 and earlier. By sending a handcrafted message, a buffer overflow may happen in a specific function. This can be used to execute code remotely. An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely. Added Reference https://www.debian.org/security/2018/dsa-4110 [No Types Assigned] Added Reference https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html [No Types Assigned] Added Reference https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1 [No Types Assigned] Added Reference http://openwall.com/lists/oss-security/2018/02/10/2 [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2018-6789 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2018-6789
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
95.81 }} -0.98%
score
0.99475
percentile