CVE-2023-5868

Se encontró una vulnerabilidad de divulgación de memoria en PostgreSQL que permite a usuarios remotos acceder a información confidencial explotando ciertas llamadas a funciones agregadas con argumentos de tipo "desconocido". El manejo de valores de tipo "desconocido" de cadenas literales sin designación de tipo puede revelar bytes, lo que potencialmente revela información importante y confidencial. Este problema existe debido a una salida excesiva de datos en llamadas a funciones agregadas, lo que permite a los usuarios remotos leer una parte de la memoria del sistema.

This update for postgresql, postgresql15, postgresql16 fixes the following issues. This update ships postgresql 16. Fixed handling of unknown-type arguments in DISTINCT "any" aggregate functions. This error led to a text-type value being interpreted as an unknown-type value at runtime. This could result in disclosure of server memory following the text value. Detect integer overflow while computing new array dimensions. When assigning new elements to array subscripts that are outside the current array bounds, an undetected integer overflow could occur in edge cases. Memory stomps that are potentially exploitable for arbitrary code execution are possible, and so is disclosure of server memory. Prevent the pg_signal_backend role from signalling background workers and autovacuum processes. The documentation says that pg_signal_backend cannot issue signals to superuser-owned processes. It was able to signal these background processes, though, because they advertise a role OID of zero. Treat that as indicating superuser ownership. The security implications of cancelling one of these process types are fairly small so far as the core code goes, but extensions might add background workers that are more vulnerable. Also ensure that the is_superuser parameter is set correctly in such processes. No specific security consequences are known for that oversight, but it might be significant for some extensions. Changes in postgresql16. Upgrade to 16.1.