CVE-2020-21686 — Return of Stack Variable Address in Netwide Assembler

CWE-562 — Return of Stack Variable AddressCWE-416 — Use After Free5 documents5 sources
Severity
5.5MEDIUMNVD
EPSS
0.2%
top 54.27%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
NasmNasm Netwide AssemblerDebian Nasm
Timeline
PublishedAug 22

Description

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.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6

Affected Packages3 packages

▶debiandebian/nasm< nasm 2.15.04-1 (bookworm)
▶NVDnasm/netwide_assembler< 2.15.04
▶Debiannasm/nasm< 2.15.04-1+3

🔴Vulnerability Details

2
OSV
CVE-2020-21686: A stack-use-after-scope issue discovered in expand_mmac_params function in preproc↗2023-08-22
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GHSA
GHSA-f5w2-2h32-hmg6: A stack-use-after-scope issue discovered in expand_mmac_params function in preproc↗2023-08-22
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📋Vendor Advisories

2
Red Hat
nasm: stack-use-after-scope in expand_mmac_params() in preproc.c↗2020-01-06
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Debian
CVE-2020-21686: nasm - A stack-use-after-scope issue discovered in expand_mmac_params function in prepr...↗2020
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