Bug 1667579 (CVE-2019-5716)

Summary:	CVE-2019-5716 wireshark: reachable assertion in fast_ensure_contiguous() from 6LoWPAN dissector
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	mruprich
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	wireshark 2.6.6	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-06-29 20:53:57 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:	1667580, 1686900
Bug Blocks:	1667594

Description Laura Pardo 2019-01-18 21:37:21 UTC

In Wireshark 2.6.0 to 2.6.5, the 6LoWPAN dissector could crash. This was addressed in epan/dissectors/packet-6lowpan.c by avoiding use of a TVB before its creation.


References:
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=15217
https://www.wireshark.org/security/wnpa-sec-2019-01.html

Upstream Patch:
https://code.wireshark.org/review/gitweb?p=wireshark.git;a=commit;h=2b2eea1793dbff813896e1ae9dff1bedb39ee010

Comment 1 Laura Pardo 2019-01-18 21:37:32 UTC

Created wireshark tracking bugs for this issue:

Affects: fedora-all [bug 1667580]

Comment 2 Riccardo Schirone 2019-03-08 15:50:47 UTC

A reachable assertion was found in fast_ensure_contiguous() function in epan/tvbuff.c file, when called from the dissect_6lowpan() function.