CVE-2020-35680 Information

Description

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 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

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

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5