CVE-2020-35680

smtpd/lka_filter.c in OpenSMTPD before 6.8.0p1, in certain configurations, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted pattern of client activity, because the filter state machine does not properly maintain the I/O channel between the SMTP engine and the filters layer.

CVSS v3.0 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3.0 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1	Patch Third Party Advisory
https://www.mail-archive.com/misc@opensmtpd.org/msg05188.html	Release Notes Third Party Advisory
https://poolp.org/posts/2020-12-24/december-2020-opensmtpd-6.8.0p1-released-fixed-several-bugs-proposed-several-diffs-book-is-on-github/	Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5LKTFBQCHGMVPR4IZWHQIYAPM5J3LN3J/	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TYAYXRV2DM5K4RU7RHCDZSA2UF6VCTRC/	Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202105-12	Third Party Advisory

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Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:opensmtpd:opensmtpd:6.8.0:-::::::
	cpe:2.3:a:opensmtpd:opensmtpd::::::::
	cpe:2.3:a:opensmtpd:opensmtpd:6.8.0:patch1-rc1::::::

Configuration 2 (hide)

OR	cpe:2.3:o:fedoraproject:fedora:32:::::::*
	cpe:2.3:o:fedoraproject:fedora:33:::::::*

Information

Published : 2020-12-24 08:15

Updated : 2022-09-01 20:47

NVD link : CVE-2020-35680

Mitre link : CVE-2020-35680

JSON object : View

CWE

CWE-476

NULL Pointer Dereference

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Products Affected

opensmtpd

opensmtpd

fedoraproject

fedora

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