Bug 1667586 (CVE-2019-5718)

Summary:	CVE-2019-5718 wireshark: out-of-bounds read in get_t61_string() in epan/charsets.c
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, wireshark 2.4.12	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-06-29 20:55:11 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:	1667587, 1686915
Bug Blocks:	1667594

Description Laura Pardo 2019-01-18 21:48:59 UTC

In Wireshark 2.6.0 to 2.6.5 and 2.4.0 to 2.4.11, the RTSE dissector and other ASN.1 dissectors could crash. This was addressed in epan/charsets.c by adding a get_t61_string length check.


References:
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=15373
https://www.wireshark.org/security/wnpa-sec-2019-03.html

Upstream Patch:
https://code.wireshark.org/review/gitweb?p=wireshark.git;a=commit;h=cd09cb5cfb673beca3cce20b1d6a9bc67a134ae1

Comment 1 Laura Pardo 2019-01-18 21:49:15 UTC

Created wireshark tracking bugs for this issue:

Affects: fedora-all [bug 1667587]

Comment 3 Riccardo Schirone 2019-03-08 16:21:56 UTC

Function get_t61_string() in charsets.c does not correctly validate its input and it reads one byte beyond the input buffer `ptr`, possibly crashing the binary or having other undefined effects.