Bug 1214516 (CVE-2020-18780)

Summary:	VUL-0: CVE-2020-18780: nasm: use-afterfree in function new_Token in asm/preproc.c
Product:	[Novell Products] SUSE Security Incidents	Reporter:	Alexander Bergmann <abergmann>
Component:	Incidents	Assignee:	Security Team bot <security-team>
Status:	RESOLVED FIXED	QA Contact:	Security Team bot <security-team>
Severity:	Minor
Priority:	P5 - None	CC:	abergmann, security-team
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/375941/
Whiteboard:
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description Alexander Bergmann 2023-08-23 08:51:25 UTC

CVE-2020-18780

A Use After Free vulnerability in function new_Token in asm/preproc.c in nasm
2.14.02 allows attackers to cause a denial of service via crafted nasm command.

The listed upstream bug (https://bugzilla.nasm.us/show_bug.cgi?id=3392634) was closed as DUPLICATE. The referenced bug report (https://bugzilla.nasm.us/show_bug.cgi?id=3392711) was already fixed with the following commit:

https://github.com/netwide-assembler/nasm/commit/7c88289e222dc5ef9f53f9e86ecaab1924744b88

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-18780
https://www.cve.org/CVERecord?id=CVE-2020-18780
https://bugzilla.nasm.us/show_bug.cgi?id=3392634
https://bugzilla.nasm.us/show_bug.cgi?id=3392711

Comment 1 Alexander Bergmann 2023-08-23 08:54:17 UTC

The fix is already present in:

SUSE:SLE-15-SP5:GA
SUSE:ALP:Source:Standard:1.0

Older code streams do not have the expand_one_smacro() function that introduced the issue.

SUSE:SLE-12:Update
SUSE:SLE-15:Update


Closing as bug as fixed.