CVE-2019-14868

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

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In ksh version 20120801, a flaw was found in the way it evaluates certain environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Services and applications that allow remote unauthenticated attackers to provide one of those environment variables could allow them to exploit this issue remotely.

En ksh versión 20120801, se detectó un fallo en la manera que evalúa determinadas variables de entorno. Un atacante podría usar este fallo para anular u omitir unas restricciones del entorno para ejecutar comandos de shell. Los servicios y las aplicaciones permiten a atacantes remotos no autenticados proporcionar una de esas variables de entorno que podrían permitirles explotar este problema remotamente.

A flaw was found in the way ksh evaluates certain environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Services and applications that allow remote unauthenticated attackers to provide one of those environment variables could allow them to exploit this issue remotely.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-08-10 CVE Reserved
2020-02-05 CVE Published
2023-03-07 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')

CAPEC

References (7)

URL	Tag	Source
http://seclists.org/fulldisclosure/2020/May/53	Mailing List
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14868	Issue Tracking
https://lists.debian.org/debian-lts-announce/2020/07/msg00015.html	Mailing List
https://support.apple.com/kb/HT211170	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/att/ast/commit/c7de8b641266bac7c77942239ac659edfee9ecd2	2023-02-12

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2019-14868	2020-12-07
https://bugzilla.redhat.com/show_bug.cgi?id=1757324	2020-12-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Ksh Project Search vendor "Ksh Project"		Ksh Search vendor "Ksh Project" for product "Ksh"				20120801 Search vendor "Ksh Project" for product "Ksh" and version "20120801"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Apple Search vendor "Apple"		Mac Os X Search vendor "Apple" for product "Mac Os X"				< 10.15.5 Search vendor "Apple" for product "Mac Os X" and version " < 10.15.5"		-		Affected