CVE-2018-6789 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.
CriticalCVSS 9.8
EPSS 82.1%
CISA KEV
added 2021-11-03 · due 2022-05-03
Ransomware
Exploited in the wild
Public exploit
PoC
- Published
- Updated
- Exploit status
- Exploited in the wild (confirmed)
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.
CISA Known Exploited Vulnerability
- Date added
- 2021-11-03
- Due date (FCEB)
- 2022-05-03
- Ransomware use
- Known
Required action
Apply updates per vendor instructions.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| debian/exim4(Debian:12) | < 4.90.1-1 | 4.90.1-1 |
| debian/exim4(Debian:13) | < 4.90.1-1 | 4.90.1-1 |
| debian/exim4(Debian:14) | < 4.90.1-1 | 4.90.1-1 |
| Exim | < 4.90.1 | 4.90.1 |
| debian linux | = 7.0 | No fix listed |
| debian linux | = 8.0 | No fix listed |
| debian linux | = 9.0 | No fix listed |
| Canonical Ubuntu Linux | = 14.04 | No fix listed |
| Canonical Ubuntu Linux | = 16.04 | No fix listed |
| Canonical Ubuntu Linux | = 17.10 | No fix listed |
| alpine/exim(Alpine:v3.10) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.11) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.12) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.13) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.14) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.15) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.16) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.17) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.18) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.19) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.20) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.21) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.22) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.23) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.24) | < 4.90.1-r0 | 4.90.1-r0 |
Show 3 more
| Product | Affected versions | Fixed in |
|---|---|---|
| alpine/exim(Alpine:v3.7) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.8) | < 4.90.1-r0 | 4.90.1-r0 |
| alpine/exim(Alpine:v3.9) | < 4.90.1-r0 | 4.90.1-r0 |
References
- Debian Security Tracker CVE-2018-6789 vendor-advisory
- bugs.debian.org issue-tracking
- openwall.com mailing-list third-party-advisory
- packetstormsecurity.com exploit third-party-advisory vdb-entry
- [oss-security] 20180207 CVE-2018-6789 Exim 4.90 and earlier: buffer overflow mailing-list third-party-advisory
- 103049 broken-link third-party-advisory vdb-entry
- 1040461 broken-link third-party-advisory vdb-entry
- devco.re exploit third-party-advisory
- exim.org vendor-advisory
- git.exim.org patch
- [debian-lts-announce] 20180210 [SECURITY] [DLA 1274-1] exim4 security update mailing-list third-party-advisory
- USN-3565-1 third-party-advisory vendor-advisory
- DSA-4110 mailing-list third-party-advisory vendor-advisory
- 44571 exploit third-party-advisory vdb-entry
- 45671 exploit third-party-advisory vdb-entry
- www.cisa.gov government-resource us-government-resource
- security.alpinelinux.org vendor-advisory