Bug 1948692 (CVE-2021-30500)

Summary:	CVE-2021-30500 upx: Null pointer dereference in PackLinuxElf::canUnpack() in p_lx_elf.cpp
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	carnil, gwync
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:	2021-04-13 00:38:56 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:	1948693, 1948694
Bug Blocks:	1948699

Description Pedro Sampaio 2021-04-12 18:37:55 UTC

Null pointer dereference was found in upx PackLinuxElf::canUnpack() in p_lx_elf.cpp,in version UPX 4.0.0. That allow attackers to execute
arbitrary code and cause a denial of service via a crafted file.

Upstream issue:

https://github.com/upx/upx/issues/48

Upstream patch:

https://github.com/upx/upx/commit/90279abdfcd235172eab99651043051188938dcc

Comment 1 Pedro Sampaio 2021-04-12 18:38:22 UTC

Created upx tracking bugs for this issue:

Affects: epel-all [bug 1948693]
Affects: fedora-all [bug 1948694]

Comment 2 Product Security DevOps Team 2021-04-13 00:38:56 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.

Comment 3 Salvatore Bonaccorso 2021-04-13 07:02:09 UTC

(In reply to Pedro Sampaio from comment #0)
> Null pointer dereference was found in upx PackLinuxElf::canUnpack() in
> p_lx_elf.cpp,in version UPX 4.0.0. That allow attackers to execute
> arbitrary code and cause a denial of service via a crafted file.
> 
> Upstream issue:
> 
> https://github.com/upx/upx/issues/48
> 
> Upstream patch:
> 
> https://github.com/upx/upx/commit/90279abdfcd235172eab99651043051188938dcc



Should the upstream issue to b referenced be https://github.com/upx/upx/issues/485 (missing last 5 digit in the issue number instead of 48)?

Comment 4 Gwyn Ciesla 2021-04-13 13:13:17 UTC

Yes, that's correct.