Bug 1911293 (CVE-2020-35680) - CVE-2020-35680 opensmtpd: NULL pointer dereference via a crafted pattern of client activity
Summary: CVE-2020-35680 opensmtpd: NULL pointer dereference via a crafted pattern of c...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2020-35680
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1911294 1911295
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-12-28 15:22 UTC by Guilherme de Almeida Suckevicz
Modified: 2020-12-28 18:27 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2020-12-28 18:27:38 UTC
Embargoed:

Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2020-12-28 15:22:45 UTC 
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:
https://www.mail-archive.com/misc@opensmtpd.org/msg05188.html

Upstream patch:
https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1
Comment 1 Guilherme de Almeida Suckevicz 2020-12-28 15:23:02 UTC 
Created opensmtpd tracking bugs for this issue:

Affects: epel-all [bug 1911295]
Affects: fedora-all [bug 1911294]
Comment 2 Product Security DevOps Team 2020-12-28 18:27:38 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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