Red Hat Security Advisory: rh-postgresql13-postgresql security update

Important

A flaw was found In PostgreSQL. A modified, unauthenticated server can send an unterminated string during the establishment of Kerberos transport encryption. In certain conditions, a server can cause a libpq client to over-read and report an error message containing uninitialized bytes.

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

A flaw was found in PostgreSQL. Certain database calls could permit an attacker with elevated database-level privileges to execute arbitrary code.

CWE-20 - Improper Input Validation

A flaw was found in PostgreSQL, which could permit incorrect policies being applied in certain cases where role-specific policies are used and a given query is planned under one role and executed under other roles. This scenario can happen under security definer functions, or when a common user and query is planned initially and then re-used across multiple SET ROLEs. Applying an incorrect policy may permit a user to complete otherwise forbidden reads and modifications. This only affects databases that have used CREATE POLICY to define a row security policy.

CWE-20 - Improper Input Validation

A memory disclosure vulnerability was found in PostgreSQL that allows remote users to access sensitive information by exploiting certain aggregate function calls with 'unknown'-type arguments. Handling 'unknown'-type values from string literals without type designation can disclose bytes, potentially revealing notable and confidential information. This issue exists due to excessive data output in aggregate function calls, enabling remote users to read some portion of system memory.

CWE-686 - Function Call With Incorrect Argument Type

A flaw was found in PostgreSQL that allows authenticated database users to execute arbitrary code through missing overflow checks during SQL array value modification. This issue exists due to an integer overflow during array modification where a remote user can trigger the overflow by providing specially crafted data. This enables the execution of arbitrary code on the target system, allowing users to write arbitrary bytes to memory and extensively read the server's memory.

CWE-190 - Integer Overflow or Wraparound

A flaw was found in PostgreSQL involving the pg_cancel_backend role that signals background workers, including the logical replication launcher, autovacuum workers, and the autovacuum launcher. Successful exploitation requires a non-core extension with a less-resilient background worker and would affect that specific background worker only. This issue may allow a remote high privileged user to launch a denial of service (DoS) attack.

CWE-400 - Uncontrolled Resource Consumption

IN THE EXTENSION SCRIPT, a SQL Injection vulnerability was found in PostgreSQL if it uses @extowner@, @extschema@, or @extschema:...@ inside a quoting construct (dollar quoting, '', or ""). If an administrator has installed files of a vulnerable, trusted, non-bundled extension, an attacker with database-level CREATE privilege can execute arbitrary code as the bootstrap superuser.

CWE-89 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')