Bug 1798671 (CVE-2020-7045)

Summary:	CVE-2020-7045 wireshark: invalid memory access in BT ATT dissector
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	denis, huzaifas, lemenkov, mruprich, msehnout, phatina, rvokal, sergey.avseyev, tcullum
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	wireshark 3.0.8	Doc Type:	If docs needed, set a value
Doc Text:	An invalid memory access vulnerability was discovered in Wireshark when processing malformed Bluetooth packets. An attacker could use this flaw to send malicious Bluetooth packets that can crash Wireshark, or trick a user into running the tool on a malformed packet trace file.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-06-29 20:27:01 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:	1801819
Bug Blocks:	1796462

Description Guilherme de Almeida Suckevicz 2020-02-05 18:49:52 UTC

In Wireshark 3.0.x before 3.0.8, the BT ATT dissector could crash. This was addressed in epan/dissectors/packet-btatt.c by validating opcodes.

References:
https://www.wireshark.org/security/wnpa-sec-2020-02.html
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=16258

Upstream commit:
https://code.wireshark.org/review/gitweb?p=wireshark.git;a=commit;h=01f261de41f4dd3233ef578e5c0ffb9c25c7d14d

Comment 1 Riccardo Schirone 2020-02-11 16:50:44 UTC

The vulnerability is in the dissect_btatt() function. The vulnerability was not present before the following commit, which added support for GATT level fields:
https://code.wireshark.org/review/gitweb?p=wireshark.git;a=commit;h=8ba3d6fbe668748097ce2dc4b8203a1c80b81be0

Comment 3 Riccardo Schirone 2020-02-11 16:58:19 UTC

Statement:

This issue did not affect the versions of wireshark as shipped with Red Hat Enterprise Linux 7 as they did not include the vulnerable code.