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ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection

🗓️ 19 May 2020 22:43:17Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 6 Views

Korn shell evaluates environment variables on startup as arithmetic expressions, enabling remote code execution.

Related
Packages
Refs
ReporterTitlePublishedViews
Family
FreeBSD		ksh93 -- certain environment variables interpreted as arithmetic expressions on startup, leading to code injection
1 Oct 201900:00
–freebsd
Apple		About the security content of macOS Catalina 10.15.5, Security Update 2020-003 Mojave, Security Update 2020-003 High Sierra
26 May 202000:00
–apple
Apple		About the security content of macOS Catalina 10.15.5, Security Update 2020-003 Mojave, Security Update 2020-003 High Sierra - Apple Support
21 Sep 202004:32
–apple
ArchLinux		[ASA-202002-4] ksh: arbitrary command execution
8 Feb 202000:00
–archlinux
Tenable Nessus		CentOS 8 : ksh (CESA-2020:0559)
1 Feb 202100:00
–nessus
Tenable Nessus		CentOS 6 : ksh (RHSA-2020:0515)
19 Feb 202000:00
–nessus
Tenable Nessus		CentOS 7 : ksh (RHSA-2020:0568)
27 Feb 202000:00
–nessus
Tenable Nessus		Debian DLA-2284-1 : ksh security update
21 Jul 202000:00
–nessus
Tenable Nessus		EulerOS 2.0 SP8 : ksh (EulerOS-SA-2020-1583)
26 May 202000:00
–nessus
Tenable Nessus		EulerOS 2.0 SP2 : ksh (EulerOS-SA-2020-1681)
17 Jun 202000:00
–nessus
Rows per page
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux7.4ppc64leksh0:20120801-36.el7_4ksh-0:20120801-36.el7_4.ppc64le.rpm
Red Hat Enterprise Linux7.4x86_64ksh0:20120801-36.el7_4ksh-0:20120801-36.el7_4.x86_64.rpm
Red Hat Enterprise Linux7.4ppc64leksh-debuginfo0:20120801-36.el7_4ksh-debuginfo-0:20120801-36.el7_4.ppc64le.rpm
Red Hat Enterprise Linux7.4x86_64ksh-debuginfo0:20120801-36.el7_4ksh-debuginfo-0:20120801-36.el7_4.x86_64.rpm

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21 Nov 2025 18:14Current
6Medium risk
Vulners AI Score6
CVSS 27.2
CVSS 3.17.4 - 7.8
EPSS0.01385
CWE-77
Korn shellenvironment variablesarithmetic expressionsstartup evaluationremote code executioncode injectionsecurity flaw
6