Bug 1861975 (CVE-2020-16094)

Summary:	CVE-2020-16094 claws-mail: malicious IMAP server can trigger stack consumption
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	andreas.bierfert, bugs.michael
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Clone Of:		Environment:
Last Closed:	2020-07-30 07:27:50 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1861976
Bug Blocks:

Description Dhananjay Arunesh 2020-07-30 05:12:00 UTC

In imap_scan_tree_recursive in Claws Mail through 3.17.6, a malicious IMAP server can trigger stack consumption because of unlimited recursion into subdirectories during a rebuild of the folder tree.

References:
https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4313

Comment 1 Dhananjay Arunesh 2020-07-30 05:12:29 UTC

Created claws-mail tracking bugs for this issue:

Affects: fedora-all [bug 1861976]

Comment 2 Product Security DevOps Team 2020-07-30 07:27:50 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.

Comment 3 Michael Schwendt 2020-07-31 13:44:43 UTC

Seems this was reported to upstream in February without a response, and referring to a "malicious IMAP server" makes it mostly something of academical interest only. There are other corner-cases left that can crash Claws Mail.