Bug 1942677 (CVE-2021-3465)

Summary:	CVE-2021-3465 p7zip: NULL pointer dereference in NCompress::CCopyCoder::Code function in CPP/7zip/Common/StreamObjects.cpp
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	matthias, perl-maint-list, sergio
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-04-12 12:34:31 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:	1943303
Bug Blocks:	1942678, 1942696

Description Guilherme de Almeida Suckevicz 2021-03-24 18:07:45 UTC

In p7zip-17.03, the function NCompress::CCopyCoder::Code in CPP/7zip/Common/StreamObjects.cpp will call outStream->Write where a memcpy uses a NULL pointer as destination address, leading to a crash.

Reference:
https://github.com/jinfeihan57/p7zip/issues/130

Comment 1 Guilherme de Almeida Suckevicz 2021-03-25 18:28:51 UTC

Created p7zip tracking bugs for this issue:

Affects: fedora-all [bug 1943303]

Comment 2 Riccardo Schirone 2021-04-12 12:34:31 UTC

This seems to be just a crash in a CLI tool, so I don't think it crosses any security boundary or that it has any security impact at all.

Comment 3 Riccardo Schirone 2021-04-12 15:01:16 UTC

Statement:

Red Hat Product Security does not consider this to be a vulnerability because it is just a crash in a command-line tool which can hardly impact Availability of any well-written service that uses 7z tool.

Comment 4 Sergio Basto 2021-04-12 15:23:51 UTC

also we don't use https://github.com/jinfeihan57 fork , at least yet .