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CVE-2020-35680

Date: December 24, 2020

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.

Language: C

Severity Score

Related Resources (14)

https://security.alpinelinux.org/vuln/CVE-2020-35680
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TYAYXRV2DM5K4RU7RHCDZSA2UF6VCTRC/
https://security.gentoo.org/glsa/202105-12
https://nvd.nist.gov/vuln/detail/CVE-2020-35680
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-35680
https://www.mail-archive.com/misc@opensmtpd.org/msg05188.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5LKTFBQCHGMVPR4IZWHQIYAPM5J3LN3J/
https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TYAYXRV2DM5K4RU7RHCDZSA2UF6VCTRC/
https://www.mail-archive.com/misc%40opensmtpd.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://security-tracker.debian.org/tracker/CVE-2020-35680
https://www.mend.io/vulnerability-database/CVE-2020-35680

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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