Red Hat Security Advisory: postgresql:18 security update

Important

A flaw was found in PostgreSQL CREATE TYPE handling for multirange types. The database failed to properly verify schema CREATE privileges during multirange type creation. An authenticated database user could exploit this issue to hijack queries that rely on search_path resolution for user-defined or extension-defined types, potentially causing execution of arbitrary SQL functions within the affected database context.

CWE-862 - Missing Authorization

A flaw was found in PostgreSQL. An integer overflow in multiple server features allows an unprivileged database user to cause an undersized memory allocation that leads to an out-of-bounds write. This issue allows an attacker to execute arbitrary code as the operating system user running the database or, in applications that pass gigabyte-scale user inputs to the relevant database functions, to cause a segmentation fault, resulting in a denial of service.

CWE-190 - Integer Overflow or Wraparound

A flaw was found in PostgreSQL. This vulnerability, an externally-controlled format string in the `timeofday()` function, allows a remote attacker to craft specific timezone zones. Successful exploitation can lead to the retrieval of sensitive portions of server memory, potentially disclosing confidential information.

CWE-134 - Use of Externally-Controlled Format String

A flaw was found in PostgreSQL. This vulnerability, related to symlink following in pg_basebackup (plain format) and pg_rewind, allows an origin superuser to overwrite local files. By exploiting this, an attacker could potentially hijack the operating system account. This attack has practical implications if specific actions are taken, such as moving files to a different virtual machine (VM) or snapshotting the VM, between the execution of these commands and the server's restart.

CWE-59 - Improper Link Resolution Before File Access ('Link Following')