start-scripts: switch to $PGUSER before opening $PGLOG.
By default, $PGUSER has permission to unlink $PGLOG. If $PGUSER
replaces $PGLOG with a symbolic link, the server will corrupt the
link-targeted file by appending log messages. Since these scripts open
$PGLOG as root, the attack works regardless of target file ownership.
"make install" does not install these scripts anywhere. Users having
manually installed them in the past should repeat that process to
acquire this fix. Most script users have $PGLOG writable to root only,
located in $PGDATA. Just before updating one of these scripts, such
users should rename $PGLOG to $PGLOG.old. The script will then recreate
$PGLOG with proper ownership.
Reviewed by Peter Eisentraut. Reported by Antoine Scemama.
Security: CVE-2017-12172
Branch
------
REL9_2_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/eda780281c9c09599d12e783c51905078674b2e8
Modified Files
--------------
contrib/start-scripts/freebsd | 4 ++--
contrib/start-scripts/linux | 4 ++--
contrib/start-scripts/osx/PostgreSQL | 8 ++++----
3 files changed, 8 insertions(+), 8 deletions(-)
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