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If, after reading /pihole.docker.tag into DOCKER_TAG, it does not match an expected pattern, unset it - this should prevent arbitary code from being run

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Signed-off-by: Adam Warner <me@adamwarner.co.uk>
This commit is contained in:
Adam Warner 2022-09-25 15:51:09 +01:00
parent b6d1bd7335
commit 9debd22179
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GPG key ID: 872950F3ECF2B173
1 changed files with 7 additions and 1 deletions
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8
advanced/Scripts/updatecheck.sh
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@ -37,8 +37,14 @@ rm -f "/etc/pihole/localversions"
VERSION_FILE="/etc/pihole/versions"
touch "${VERSION_FILE}"
chmod 644 "${VERSION_FILE}"
# if /pihole.docker.tag file exists, we will use it's value later in this script
DOCKER_TAG=$(cat file 2>/dev/null)
DOCKER_TAG=$(cat /pihole.docker.tag 2>/dev/null)
regex='^([0-9]+\.){1,2}(\*|[0-9]+)(-.*)?$|(^nightly$)|(^dev.*$)'
if [[ ! "${DOCKER_TAG}" =~ $regex ]]; then
# DOCKER_TAG does not match the pattern (see https://regex101.com/r/RsENuz/1), so unset it.
unset DOCKER_TAG
fi
if [[ "$2" == "remote" ]]; then