crítica
CVE-2018-6789
exim: buffer overflow in b64decode() function, possibly leading to remote code execution
En la Trivy database desde, como mínimo, el 24 oct 2026, 07:11 UTCNo consta cuándo entró antes de ese build.
Severidad por fuente
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat8.1CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
La etiqueta propia de Trivy es CRITICAL. Crítica según NVD, Red Hat, Amazon. Más baja según Ubuntu (media).
Descripción
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.
Paquetes afectados y versiones corregidas
| Fuente | Paquete | Corregido en |
|---|---|---|
| amazon linux 1 | exim, exim-debuginfo, exim-greylist y 3 más | 4.90.1-2.14.amzn1 |
| alpine 3.10 | exim | 4.90.1-r0 |
| alpine 3.11 | exim | 4.90.1-r0 |
| alpine 3.12 | exim | 4.90.1-r0 |
| alpine 3.13 | exim | 4.90.1-r0 |
| alpine 3.14 | exim | 4.90.1-r0 |
| alpine 3.15 | exim | 4.90.1-r0 |
| alpine 3.16 | exim | 4.90.1-r0 |
| alpine 3.17 | exim | 4.90.1-r0 |
| alpine 3.18 | exim | 4.90.1-r0 |
| alpine 3.19 | exim | 4.90.1-r0 |
| alpine 3.20 | exim | 4.90.1-r0 |
Mostrar las 38 entradas de 33 fuentes
| Fuente | Paquete | Corregido en |
|---|---|---|
| amazon linux 1 | exim | 4.90.1-2.14.amzn1 |
| amazon linux 1 | exim-debuginfo | 4.90.1-2.14.amzn1 |
| amazon linux 1 | exim-greylist | 4.90.1-2.14.amzn1 |
| amazon linux 1 | exim-mon | 4.90.1-2.14.amzn1 |
| amazon linux 1 | exim-mysql | 4.90.1-2.14.amzn1 |
| amazon linux 1 | exim-pgsql | 4.90.1-2.14.amzn1 |
| alpine 3.10 | exim | 4.90.1-r0 |
| alpine 3.11 | exim | 4.90.1-r0 |
| alpine 3.12 | exim | 4.90.1-r0 |
| alpine 3.13 | exim | 4.90.1-r0 |
| alpine 3.14 | exim | 4.90.1-r0 |
| alpine 3.15 | exim | 4.90.1-r0 |
| alpine 3.16 | exim | 4.90.1-r0 |
| alpine 3.17 | exim | 4.90.1-r0 |
| alpine 3.18 | exim | 4.90.1-r0 |
| alpine 3.19 | exim | 4.90.1-r0 |
| alpine 3.20 | exim | 4.90.1-r0 |
| alpine 3.21 | exim | 4.90.1-r0 |
| alpine 3.22 | exim | 4.90.1-r0 |
| alpine 3.23 | exim | 4.90.1-r0 |
| alpine 3.24 | exim | 4.90.1-r0 |
| alpine 3.7 | exim | 4.90.1-r0 |
| alpine 3.8 | exim | 4.90.1-r0 |
| alpine 3.9 | exim | 4.90.1-r0 |
| alpine edge | exim | 4.90.1-r0 |
| debian 11 | exim4 | 4.90.1-1 |
| debian 12 | exim4 | 4.90.1-1 |
| debian 13 | exim4 | 4.90.1-1 |
| debian 14 | exim4 | 4.90.1-1 |
| debian 7 | exim4 | 4.80-7+deb7u6 |
| debian 8 | exim4 | 4.84.2-2+deb8u5 |
| debian 9 | exim4 | 4.89-2+deb9u3 |
| echo | exim4 | 4.90.1-1 |
| ubuntu 14.04 | exim4 | 4.82-3ubuntu2.4 |
| ubuntu 14.04-ESM | exim4 | 4.82-3ubuntu2.4 |
| ubuntu 16.04 | exim4 | 4.86.2-2ubuntu2.3 |
| ubuntu 16.04-ESM | exim4 | 4.86.2-2ubuntu2.3 |
| ubuntu 17.10 | exim4 | 4.89-5ubuntu1.3 |
Referencias
- http://openwall.com/lists/oss-security/2018/02/10/2
- http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html
- http://www.openwall.com/lists/oss-security/2018/02/07/2
- http://www.securityfocus.com/bid/103049
- http://www.securitytracker.com/id/1040461
- https://access.redhat.com/security/cve/CVE-2018-6789
- https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/
- https://exim.org/static/doc/security/CVE-2018-6789.txt
Las 19 referencias
- https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1
- https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html
- https://nvd.nist.gov/vuln/detail/CVE-2018-6789
- https://ubuntu.com/security/notices/USN-3565-1
- https://usn.ubuntu.com/3565-1/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789
- https://www.cve.org/CVERecord?id=CVE-2018-6789
- https://www.debian.org/security/2018/dsa-4110
- https://www.exploit-db.com/exploits/44571/
- https://www.exploit-db.com/exploits/45671/