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TMA-FREEBSD-4.3.2

Ensure sudo commands use pty

HochStufe 1Automatisiertfreebsd

Beschreibung

sudo can be configured to run only from a pseudo terminal (pseudo-pty). Attackers can run a malicious program using sudo which would fork a background process that remains even when the main program has finished executing. Audit: automated read-only check derived from the CIS audit procedure; it prints "compliant" when the control is met.

So wird geprüft

Prüfmethode: Shell-Befehl

shell
c=$(cat /usr/local/etc/sudoers /usr/local/etc/sudoers.d/* 2>/dev/null); [ -n "$c" ] || exit 1; printf '%s\n' "$c" | grep -Eiq "^[[:space:]]*Defaults[[:space:]]+([^#]+,[[:space:]]*)?!use_pty" && { echo "!use_pty set"; exit 0; }; printf '%s\n' "$c" | grep -Eiq "^[[:space:]]*Defaults[[:space:]]+([^#]+,[[:space:]]*)?use_pty([[:space:]]*,|[[:space:]]*$|[[:space:]]+#)" && echo compliant || echo "Defaults use_pty not set"
Erwartete Ausgabe
compliant

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

Edit the file /usr/local/etc/sudoers with visudo or a file in /usr/local/etc/sudoers.d/ with visudo -f <PATH_TO_FILE> and add the following line: Defaults use_pty Note: sudo will read each file in /usr/local/etc/sudoers.d, skipping file names that end in ~ or contain a . character to avoid causing problems with package manager or editor temporary/backup files. Files are parsed in sorted lexical order. That is, /usr/local/etc/sudoers.d/01_first will be parsed before /usr/local/etc/sudoers.d/10_second. Be aware that because the sorting is lexical, not numeric, /usr/local/etc/sudoers.d/1_whoops would be loaded after /usr/local/etc/sudoers.d/10_second. Using a consistent number of leading zeroes in the file names can be used to avoid such problems.

Eigenschaften

Betriebssysteme
Beliebig
Tags
freebsdhardening
Referenz
CIS FreeBSD 14 Benchmark v1.0.1 - 4.3.2 Ensure sudo commands use pty

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