Bug 2234946 (CVE-2020-21686)

Summary:	CVE-2020-21686 nasm: stack-use-after-scope in expand_mmac_params() in preproc.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	nickc, sipoyare
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	nasm 2.15.04	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:		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:	2234962, 2234965, 2234966
Bug Blocks:	2234904

Description Guilherme de Almeida Suckevicz 2023-08-25 18:47:20 UTC

A stack-use-after-scope issue discovered in expand_mmac_params function in preproc.c in nasm before 2.15.04 allows remote attackers to cause a denial of service via crafted asm file.

Reference:
https://bugzilla.nasm.us/show_bug.cgi?id=3392643

Comment 1 Guilherme de Almeida Suckevicz 2023-08-25 19:09:38 UTC

Created nasm tracking bugs for this issue:

Affects: fedora-all [bug 2234962]