CVE-2018-6789
Exim Buffer Overflow Vulnerability
Severity Score
9.8
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
10
*Multiple Sources
Exploited in Wild
Yes
*KEV
Decision
Act
*SSVC
Descriptions
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.
Se ha descubierto un problema en la función base64d en el escuchador SMTP en Exim, en versiones anteriores a la 4.90.1. Al enviar un mensaje manipulado, podría ocurrir un desbordamiento de búfer. Esto puede emplearse para ejecutar código de forma remota.
Meh Chang discovered a buffer overflow flaw in a utility function used in the SMTP listener of Exim, a mail transport agent. A remote attacker can take advantage of this flaw to cause a denial of service, or potentially the execution of arbitrary code via a specially crafted message.
Exim contains a buffer overflow vulnerability in the base64d function part of the SMTP listener that may allow for remote code execution.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Act
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2018-02-06 CVE Reserved
- 2018-02-08 CVE Published
- 2018-05-03 First Exploit
- 2021-11-03 Exploited in Wild
- 2022-05-03 KEV Due Date
- 2025-02-07 CVE Updated
- 2025-04-01 EPSS Updated
CWE
- CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
- CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CAPEC
References (21)
| URL | Tag | Source |
|---|---|---|
| http://openwall.com/lists/oss-security/2018/02/10/2 | Mailing List | |
| http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html | X_refsource_misc |
|
| http://www.openwall.com/lists/oss-security/2018/02/07/2 | Mailing List |
|
| http://www.securityfocus.com/bid/103049 | Third Party Advisory | |
| http://www.securitytracker.com/id/1040461 | Third Party Advisory | |
| https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en | Technical Description | |
| https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html | Mailing List |
|
| URL | Date | SRC |
|---|---|---|
| https://packetstorm.news/files/id/162959 | 2021-06-03 | |
| https://packetstorm.news/files/id/149926 | 2018-10-24 | |
| https://packetstorm.news/files/id/147456 | 2018-05-03 | |
| https://www.exploit-db.com/exploits/45671 | 2025-02-07 | |
| https://www.exploit-db.com/exploits/44571 | 2025-02-07 | |
| https://github.com/synacktiv/Exim-CVE-2018-6789 | 2019-10-10 | |
| https://github.com/beraphin/CVE-2018-6789 | 2020-03-06 | |
| https://github.com/c0llision/exim-vuln-poc | 2018-05-03 | |
| https://github.com/martinclauss/exim-rce-cve-2018-6789 | 2024-11-21 | |
| https://github.com/thistehneisen/CVE-2018-6789-Python3 | 2023-08-05 |
| URL | Date | SRC |
|---|---|---|
| https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1 | 2021-06-03 |
| URL | Date | SRC |
|---|---|---|
| https://exim.org/static/doc/security/CVE-2018-6789.txt | 2021-06-03 | |
| https://usn.ubuntu.com/3565-1 | 2021-06-03 | |
| https://www.debian.org/security/2018/dsa-4110 | 2021-06-03 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Exim Search vendor "Exim" | Exim Search vendor "Exim" for product "Exim" | < 4.90.1 Search vendor "Exim" for product "Exim" and version " < 4.90.1" | - |
Affected
| ||||||
| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 7.0 Search vendor "Debian" for product "Debian Linux" and version "7.0" | - |
Affected
| ||||||
| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0" | - |
Affected
| ||||||
| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0" | - |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04" | lts |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04" | lts |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 17.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "17.10" | - |
Affected
| ||||||