Vulnerability Monitor

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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.

Published

2018-02-08T23:29:01.170

Last Modified

2025-03-14T20:05:26.027

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

6.4

Weaknesses

Type: Primary
CWE-120
Type: Secondary
CWE-120

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	exim	exim	< 4.90.1	Yes
Operating System	debian	debian_linux	7.0	Yes
Operating System	debian	debian_linux	8.0	Yes
Operating System	debian	debian_linux	9.0	Yes
Operating System	canonical	ubuntu_linux	14.04	Yes
Operating System	canonical	ubuntu_linux	16.04	Yes
Operating System	canonical	ubuntu_linux	17.10	Yes

References

http://openwall.com/lists/oss-security/2018/02/10/2 Mailing List, Third Party Advisory ([email protected])
http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html Exploit, Third Party Advisory, VDB Entry ([email protected])
http://www.openwall.com/lists/oss-security/2018/02/07/2 Mailing List, Third Party Advisory ([email protected])
http://www.securityfocus.com/bid/103049 Broken Link, Third Party Advisory, VDB Entry ([email protected])
http://www.securitytracker.com/id/1040461 Broken Link, Third Party Advisory, VDB Entry ([email protected])
https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/ Exploit, Third Party Advisory ([email protected])
https://exim.org/static/doc/security/CVE-2018-6789.txt Vendor Advisory ([email protected])
https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1 Patch ([email protected])
https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html Mailing List, Third Party Advisory ([email protected])
https://usn.ubuntu.com/3565-1/ Third Party Advisory ([email protected])
https://www.debian.org/security/2018/dsa-4110 Mailing List, Third Party Advisory ([email protected])
https://www.exploit-db.com/exploits/44571/ Exploit, Third Party Advisory, VDB Entry ([email protected])
https://www.exploit-db.com/exploits/45671/ Exploit, Third Party Advisory, VDB Entry ([email protected])
http://openwall.com/lists/oss-security/2018/02/10/2 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html Exploit, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2018/02/07/2 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/103049 Broken Link, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1040461 Broken Link, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/ Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://exim.org/static/doc/security/CVE-2018-6789.txt Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1 Patch (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/3565-1/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.debian.org/security/2018/dsa-4110 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.exploit-db.com/exploits/44571/ Exploit, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://www.exploit-db.com/exploits/45671/ Exploit, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)