Bug 1877786 (CVE-2020-24978)

Summary:	CVE-2020-24978 nasm: double-free vulnerability in pp_tokline asm/preproc.c
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	mizdebsk, nickc
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Last Closed:	2020-09-11 01:17:44 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1877787

Description Michael Kaplan 2020-09-10 12:50:00 UTC

In NASM 2.15.04rc3, there is a double-free vulnerability in pp_tokline asm/preproc.c. This is fixed in commit 8806c3ca007b84accac21dd88b900fb03614ceb7.

References:

https://bugzilla.nasm.us/show_bug.cgi?id=3392712

Comment 2 Todd Cullum 2020-09-10 22:23:47 UTC

This would not reproduce for me on nasm 2.10.07 or 2.13.03. Upon further inspection of the source code pp_tokline does not exist in these versions yet, it seems it was introduced in commit a7afe276da2fba43fd906dbaad1497a2e0994693 tagged nasm-2.15rc1, which we do not ship.

Comment 3 Todd Cullum 2020-09-10 22:25:35 UTC

Statement:

This flaw does not affect nasm as shipped in Red Hat Enterprise Linux 7 or 8 as the vulnerable code was committed in a newer version of nasm.

Comment 4 Product Security DevOps Team 2020-09-11 01:17:44 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-24978