Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Exim | Exim | < 4.90.1 |
| Debian | Debian Linux | 7.0 |
| Canonical | Ubuntu Linux | 14.04 |
Related Weaknesses (CWE)
References
- http://openwall.com/lists/oss-security/2018/02/10/2Mailing ListThird Party Advisory
- http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.htmlExploitThird Party AdvisoryVDB Entry
- http://www.openwall.com/lists/oss-security/2018/02/07/2Mailing ListThird Party Advisory
- http://www.securityfocus.com/bid/103049Broken LinkThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1040461Broken LinkThird Party AdvisoryVDB Entry
- https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-enExploitThird Party Advisory
- https://exim.org/static/doc/security/CVE-2018-6789.txtVendor Advisory
- https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1Patch
- https://lists.debian.org/debian-lts-announce/2018/02/msg00009.htmlMailing ListThird Party Advisory
- https://usn.ubuntu.com/3565-1/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4110Mailing ListThird Party Advisory
- https://www.exploit-db.com/exploits/44571/ExploitThird Party AdvisoryVDB Entry
- https://www.exploit-db.com/exploits/45671/ExploitThird Party AdvisoryVDB Entry
- http://openwall.com/lists/oss-security/2018/02/10/2Mailing ListThird Party Advisory
- http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.htmlExploitThird Party AdvisoryVDB Entry
FAQ
What is CVE-2018-6789?
CVE-2018-6789 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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.
How severe is CVE-2018-6789?
CVE-2018-6789 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2018-6789?
Check the references section above for vendor advisories and patch information. Affected products include: Exim Exim, Debian Debian Linux, Canonical Ubuntu Linux.