PostgreSQL MERGE bypasses RLS UPDATE/SELECT checks, allows unauthorized inserts
CVE-2023-39418 Published on August 11, 2023

Postgresql: merge fails to enforce update or select row security policies
A vulnerability was found in PostgreSQL with the use of the MERGE command, which fails to test new rows against row security policies defined for UPDATE and SELECT. If UPDATE and SELECT policies forbid some rows that INSERT policies do not forbid, a user could store such rows.

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Vulnerability Analysis

CVE-2023-39418 is exploitable with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
LOW
Availability Impact:
NONE

Timeline

Reported to Red Hat.

Made public. 9 days later.

Weakness Type

Insufficient Granularity of Access Control

The product implements access controls via a policy or other feature with the intention to disable or restrict accesses (reads and/or writes) to assets in a system from untrusted agents. However, implemented access controls lack required granularity, which renders the control policy too broad because it allows accesses from unauthorized agents to the security-sensitive assets.


Products Associated with CVE-2023-39418

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Canonical Ubuntu Linux
 
PostgreSQL
 
Red Hat Enterprise Linux (RHEL)
 
Debian Linux
 
Red Hat Rhel Eus
 
Red Hat Rhel Software Collections
 

Affected Versions

Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8.8 Extended Update Support: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9.2 Extended Update Support: Red Hat Enterprise Linux 6: Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat Software Collections: Red Hat Software Collections: Red Hat Software Collections:

Exploit Probability

EPSS
0.44%
Percentile
62.86%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.