Bug 1911289 (CVE-2020-35679)

Summary:	CVE-2020-35679 opensmtpd: memory leak via messages to an instance that performs many regex lookups due to a missing regfree call
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 18:27:36 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:	1911290, 1911291
Bug Blocks:

Description Guilherme de Almeida Suckevicz 2020-12-28 15:19:16 UTC

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.

Reference:
https://www.mail-archive.com/misc@opensmtpd.org/msg05188.html

Upstream patch:
https://github.com/openbsd/src/commit/79a034b4aed29e965f45a13409268290c9910043

Comment 1 Guilherme de Almeida Suckevicz 2020-12-28 15:19:35 UTC

Created opensmtpd tracking bugs for this issue:

Affects: epel-all [bug 1911291]
Affects: fedora-all [bug 1911290]

Comment 2 Product Security DevOps Team 2020-12-28 18:27:36 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.