Bug 1790323

Summary:	enigmail: Unsigned MIME parts displayed as signed
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	fschwarz
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	enigmail 2.1.5	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-01-13 08:09:32 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:	1790324, 1790325
Bug Blocks:

Description Pedro Sampaio 2020-01-13 06:37:00 UTC

Using Content-Type = multipart/alternative, it is possible to trick Enigmail into displaying a valid signature status for a MIME part that is actually not signed.

Such messages have the following structrure (or similar):

multipart/alternative
|- multipart/signed
|  |- text/plain
|
|- text/html

Fixed in 2.1.5.

Reproducer:

https://sourceforge.net/p/enigmail/bugs/1044/attachment/Sample%20Message.eml
https://sourceforge.net/p/enigmail/bugs/_discuss/thread/90e18ceedb/e1d4/attachment/Pubkey.asc

References:

https://sourceforge.net/p/enigmail/bugs/1044/

Comment 1 Pedro Sampaio 2020-01-13 06:37:21 UTC

Created thunderbird-enigmail tracking bugs for this issue:

Affects: epel-7 [bug 1790325]
Affects: fedora-all [bug 1790324]

Comment 2 Product Security DevOps Team 2020-01-13 08:09:32 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.