Bug 2208605 (CVE-2023-31973)

Summary:	CVE-2023-31973 yasm: use-after-free in expand_mmac_params() in modules/preprocs/nasm/nasm-pp.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	fjansen, nickc, sipoyare
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
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Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2208606, 2208607, 2208618, 2208619
Bug Blocks:	2196620

Description Guilherme de Almeida Suckevicz 2023-05-19 18:00:14 UTC

yasm v1.3.0 was discovered to contain a use after free via the function expand_mmac_params at /nasm/nasm-pp.c.

Reference:
https://github.com/yasm/yasm/issues/207

Comment 1 Guilherme de Almeida Suckevicz 2023-05-19 18:00:32 UTC

Created yasm tracking bugs for this issue:

Affects: epel-all [bug 2208606]
Affects: fedora-all [bug 2208607]

Comment 3 Siddhesh Poyarekar 2023-05-19 19:31:48 UTC

This should be rejected as per yasm security policy, unless there's a way this could be exploited using *trusted* input:

https://github.com/yasm/yasm/blob/master/SECURITY.md