Bug 1180366 – [server:mail]: CVE-2020-35679,CVE-2020-35680: opensmtpd: 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, bec

Bug 1180366 - (CVE-2020-35679) [server:mail]: CVE-2020-35679,CVE-2020-35680: opensmtpd: 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, bec

(CVE-2020-35679)
Summary:	[server:mail]: CVE-2020-35679,CVE-2020-35680: opensmtpd: in certain configura...

Status:	RESOLVED FIXED

Classification:	Novell Products
Product:	SUSE Security Incidents
Classification:	Novell Products
Component:	Incidents
Version:	unspecified
Hardware:	Other Other

Priority:	P5 - None Severity: Minor
Target Milestone:	---
Assigned To:	Alexander Evseev
QA Contact:	Security Team bot

URL:	https://smash.suse.de/issue/274014/
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Reported:	2020-12-26 08:19 UTC by Marcus Meissner
Modified:	2020-12-28 20:47 UTC (History)
CC List:	1 user (show)

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Found By:	Security Response Team
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Description Marcus Meissner 2020-12-26 08:19:34 UTC

CVE-2020-35680

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.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-35680
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35680
https://github.com/openbsd/src/commit/6c3220444ed06b5796dedfd53a0f4becd903c0d1
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://www.mail-archive.com/misc@opensmtpd.org/msg05188.html

Comment 1 Marcus Meissner 2020-12-26 08:20:14 UTC

CVE-2020-35679

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-35679 

smtpd/table.c in OpenSMTPD before 6.8.0p1 lacks a certain regfree, which might
allow attackers to trigger a "very significant" memory leak via messages to an
instance that performs many regex lookups.

Comment 2 Alexander Evseev 2020-12-28 20:47:02 UTC

Updated to 6.8.0p2