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Test your applicationsUpgrade Amazon-Linux:2018.03 php-pgsql to version 0:5.3.8-3.19.amzn1 or higher.
This issue was patched in ALAS-2011-7.
Note: Versions mentioned in the description apply only to the upstream php-pgsql package and not the php-pgsql package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2018.03 relevant fixed versions and status.
crypt_blowfish before 1.1, as used in PHP before 5.3.7 on certain platforms, PostgreSQL before 8.4.9, and other products, does not properly handle 8-bit characters, which makes it easier for context-dependent attackers to determine a cleartext password by leveraging knowledge of a password hash.