CVE-2019-14868 – ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection

https://notcve.org/view.php?id=CVE-2019-14868

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. • http://seclists.org/fulldisclosure/2020/May/53 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14868 https://github.com/att/ast/commit/c7de8b641266bac7c77942239ac659edfee9ecd2 https://lists.debian.org/debian-lts-announce/2020/07/msg00015.html https://support.apple.com/kb/HT211170 https://access.redhat.com/security/cve/CVE-2019-14868 https://bugzilla.redhat.com/show_bug.cgi?id=1757324 • CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') •