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.
Classic Buffer Overflow
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
mitreCNA
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CVEADP
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CISA-ADPADP
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 99%
VendorProductVersion
eximexim
𝑥
< 4.90.1
debiandebian_linux
7.0
debiandebian_linux
8.0
debiandebian_linux
9.0
canonicalubuntu_linux
14.04
canonicalubuntu_linux
16.04
canonicalubuntu_linux
17.10
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
exim4
bullseye
4.94.2-7+deb11u3
fixed
bullseye (security)
4.94.2-7+deb11u4
fixed
bookworm
4.96-15+deb12u5
fixed
bookworm (security)
4.96-15+deb12u5
fixed
sid
4.98-2
fixed
trixie
4.98-2
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
exim4
artful
Fixed 4.89-5ubuntu1.3
released
xenial
Fixed 4.86.2-2ubuntu2.3
released
trusty
Fixed 4.82-3ubuntu2.4
released
Common Weakness Enumeration
References
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/
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://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789