SB2021061012 - Red Hat Enterprise Linux 8.4 update for the postgresql:12 module
Published: June 10, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Information disclosure (CVE-ID: CVE-2021-3393)
The vulnerability allows a remote user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output in the error message. A remote user having an UPDATE privilege on a partitioned table but lacking the
SELECT privilege on some column may be able to acquire denied-column values
from an error message. This vulnerability is similar to #VU30418.
2) Integer overflow (CVE-ID: CVE-2021-32027)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer overflow when processing certain SQL array values during array subscribing calculation. An authenticated database user can pass specially crafted data to the application, trigger integer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system and can be exploited by a remote unauthenticated attacker via SQL injection vulnerability in the frontend application.
3) Memory leak (CVE-ID: CVE-2021-32028)
The vulnerability allows a remote user to gain access to sensitive information.
The vulnerability exists due memory leak within the INSERT ... ON CONFLICT ... DO UPDATE command implementation. A remote authenticated database user can execute the affected command to read arbitrary bytes of server memory. In the default
configuration, any authenticated database user can create prerequisite objects
and complete this attack at will.
4) Memory leak (CVE-ID: CVE-2021-32029)
The vulnerability allows a remote user to gain access to sensitive information.
The vulnerability exists due memory leak when processing UPDATE ... RETURNING command on a purpose-crafted partitioned table. A remote authenticated user can run the affected command and read arbitrary bytes of server memory. In the default
configuration, any authenticated database user can create prerequisite objects
and complete this attack at will.
Remediation
Install update from vendor's website.