CVE-2020-35680

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Summary:

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.

Reference Links(if available):

  • https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1
  • https://www.mail-archive.com/[email protected]/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/[email protected]/message/5LKTFBQCHGMVPR4IZWHQIYAPM5J3LN3J/
  • https://lists.fedoraproject.org/archives/list/[email protected]/message/TYAYXRV2DM5K4RU7RHCDZSA2UF6VCTRC/
  • CVSS Score (if available)

    v2: / HIGHAV:N/AC:L/Au:N/C:N/I:N/A:P

    v3: / HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

    Links to Exploits(if available)