CVE-2018-6789

critical-risk
Published 2018-02-08

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.

Do I need to act?

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86.4% chance of exploitation in next 30 days
EPSS score — higher than 14% of all CVEs
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CISA KEV: actively exploited in the wild
On the Known Exploited Vulnerabilities catalog — federal agencies must patch
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2 public exploits available
45671, 44571
+
Fix available
Upgrade to: 062990cc1b2f9e5d82a413b53c8f0569075de700
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (7)

Affected Vendors

Debian Canonical Exim

References (27)

Mailing List http://openwall.com/lists/oss-security/2018/02/10/2
Exploit http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html
Mailing List http://www.openwall.com/lists/oss-security/2018/02/07/2
Broken Link http://www.securityfocus.com/bid/103049
Broken Link http://www.securitytracker.com/id/1040461
Exploit https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en...
Vendor Advisory https://exim.org/static/doc/security/CVE-2018-6789.txt
Patch https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1
Mailing List https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html
Third Party Advisory https://usn.ubuntu.com/3565-1/
Mailing List https://www.debian.org/security/2018/dsa-4110
Exploit https://www.exploit-db.com/exploits/44571/
Exploit https://www.exploit-db.com/exploits/45671/
Mailing List http://openwall.com/lists/oss-security/2018/02/10/2
Exploit http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html
Mailing List http://www.openwall.com/lists/oss-security/2018/02/07/2
Broken Link http://www.securityfocus.com/bid/103049
Broken Link http://www.securitytracker.com/id/1040461
Exploit https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en...
Vendor Advisory https://exim.org/static/doc/security/CVE-2018-6789.txt
and 7 more references
73
/ 100
critical-risk
Severity 32/34 · Critical
Exploitability 27/34 · High
Exposure 14/34 · Moderate