CVE-2018-6789: Exim Buffer Overflow Vulnerability
First published: Thu Feb 08 2018(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Exim Exim | <4.90.1 | |
| Debian Debian Linux | =7.0 | |
| Debian Debian Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =17.10 | |
| debian/exim4 | <=4.90-1<=4.80-1 | 4.90.1-1 4.89-2+deb9u3 4.84.2-2+deb8u5 |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =16.04 | |
| Exim Exim | ||
| debian/exim4 | 4.94.2-7+deb11u3 4.94.2-7+deb11u4 4.96-15+deb12u5 4.98-2 |
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Reference Links
- 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://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
- https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1
- https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html
- https://usn.ubuntu.com/3565-1/
- https://www.debian.org/security/2018/dsa-4110
- https://www.exploit-db.com/exploits/44571/
- https://www.exploit-db.com/exploits/45671/
- https://security-tracker.debian.org/tracker/CVE-2018-6789
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6789
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=890000
- https://launchpad.net/bugs/cve/CVE-2018-6789
- https://nvd.nist.gov/vuln/detail/CVE-2018-6789
- https://www.openwall.com/lists/oss-security/2018/02/07/2
- https://bugs.exim.org/show_bug.cgi?id=2235
- https://git.exim.org/exim.git/commit/062990cc1b2f9e5d82a413b53c8f0569075de700
- https://ubuntu.com/security/CVE-2018-6789
Frequently Asked Questions
What is CVE-2018-6789?
CVE-2018-6789 is a vulnerability in Exim that can result in a buffer overflow, allowing remote code execution.
What is the severity level of CVE-2018-6789?
The severity level of CVE-2018-6789 is critical, with a CVSS score of 9.8.
What software or versions are affected by CVE-2018-6789?
Exim versions up to and exclusive of 4.90.1, Debian Linux 7.0 to 9.0, and Ubuntu Linux 14.04 to 17.10 are affected by CVE-2018-6789.
How can CVE-2018-6789 be fixed?
To fix CVE-2018-6789, users should update to Exim version 4.90.1 or later, or apply the appropriate patches provided by Debian or Ubuntu.
Where can I find more information about CVE-2018-6789?
More information about CVE-2018-6789 can be found at the Debian Security Tracker, MITRE CVE website, and the Exim website.
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