Bug 1911293 (CVE-2020-35680)

Summary:	CVE-2020-35680 opensmtpd: NULL pointer dereference via a crafted pattern of client activity
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	denis
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-12-28 18:27:38 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1911294, 1911295
Bug Blocks:

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.