Vulnerability CVE-2018-6789
Published: 2018-02-08   Modified: 2018-02-09

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.

See advisories in our WLB2 database:
Topic
Author
Date
High
Exim < 4.90.1 base64d Remote Code Execution
straight_blast
02.05.2018
High
Exim 4.90 Remote Code Execution
hackk.gr
25.10.2018
High
Exim base64d Buffer Overflow
Johnny Yu
06.06.2021

Type:

CWE-119

 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
EXIM -> EXIM 
Debian -> Debian linux 
Canonical -> Ubuntu linux 

 References:
http://openwall.com/lists/oss-security/2018/02/10/2
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/
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