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                                    CERT-Renater

                        Note d'Information No. 2024/VULN097
_____________________________________________________________________

DATE                : 07/03/2024

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running PostgreSQL JDBC Driver versions
                      prior to 42.7.2, 42.6.1, 42.5.5, 42.4.4, 42.3.9,
                                  42.2.28, 42.2.28.jre7.

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https://www.postgresql.org/about/news/postgresql-jdbc-4272-4261-4255-4244-4239-42228-and-42228jre7-security-update-for-cve-2024-1597-2812/
https://github.com/pgjdbc/pgjdbc/security/advisories/GHSA-24rp-q3w6-vc56
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PostgreSQL JDBC 42.7.2, 42.6.1, 42.5.5, 42.4.4, 42.3.9, 42.2.28,
and 42.2.28.jre7 Security update for CVE-2024-1597

Posted on 2024-02-21 by JDBC Project
Related Open Source Security

The PostgreSQL JDBC team have released 42.7.2, 42.6.1, 42.5.5,
42.4.4, 42.3.9, 42.2.28, and 42.2.28.jre7 to address a security
issue: CVE-2024-1597. (Note there is no fix for 42.2.26.jre6 see
the advisory for workarounds)

SQL injection is possible when using the non-default connection
property preferQueryMode=simple in combination with application
code that has a vulnerable SQL that negates a parameter value.

There is no vulnerability in the driver when using the default
query mode. Users that do not override the query mode are not
impacted.

See the security advisory for the details. Thanks to Paul Gerste
for finding and reporting the issue.


_____________________________________________________________________

SQL Injection via line comment generation
Critical
davecramer published GHSA-24rp-q3w6-vc56 Feb 21, 2024

Package
org.postgresql:postgresql (Maven)


Affected versions
< 42.2.28
< 42.3.9
< 42.4.4
< 42.5.5
< 42.6.1
< 42.7.2

Patched versions
42.2.28, 42.2.28.jre7
42.3.9
42.4.4
42.5.5
42.6.1
42.7.2


Description

Impact

SQL injection is possible when using the non-default connection property
preferQueryMode=simple in combination with application code that has a
vulnerable SQL that negates a parameter value.

There is no vulnerability in the driver when using the default query
mode. Users that do not override the query mode are not impacted.


Exploitation

To exploit this behavior the following conditions must be met:

      A placeholder for a numeric value must be immediately preceded by
a minus (i.e. -)
      There must be a second placeholder for a string value after the
first placeholder on the same line.
      Both parameters must be user controlled.

The prior behavior of the driver when operating in simple query mode
would inline the negative value of the first parameter and cause the
resulting line to be treated as a -- SQL comment. That would extend
to the beginning of the next parameter and cause the quoting of that
parameter to be consumed by the comment line. If that string parameter
includes a newline, the resulting text would appear unescaped in the
resulting SQL.

When operating in the default extended query mode this would not be
an issue as the parameter values are sent separately to the server.
Only in simple query mode the parameter values are inlined into the
executed SQL causing this issue.


Example

PreparedStatement stmt = conn.prepareStatement("SELECT -?, ?");
stmt.setInt(1, -1);
stmt.setString(2, "\nWHERE false --");
ResultSet rs = stmt.executeQuery();

The resulting SQL when operating in simple query mode would be:

SELECT --1,'
WHERE false --'

The contents of the second parameter get injected into the command.
Note how both the number of result columns and the WHERE clause of
the command have changed. A more elaborate example could execute
arbitrary other SQL commands.


Patch

Problem will be patched upgrade to 42.7.2, 42.6.1, 42.5.5, 42.4.4,
42.3.9, 42.2.28, 42.2.28.jre7

The patch fixes the inlining of parameters by forcing them all to
be serialized as wrapped literals. The SQL in the prior example
would be transformed into:

SELECT -('-1'::int4), ('
WHERE false --')


Workarounds

Do not use the connection propertypreferQueryMode=simple. (NOTE:
If you do not explicitly specify a query mode then you are using
the default of extended and are not impacted by this issue.)


Severity
Critical

10.0/ 10

CVSS base metrics

Attack vector
Network

Attack complexity
Low

Privileges required
None

User interaction
None

Scope
Changed

Confidentiality
High

Integrity
High

Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVE ID
CVE-2024-1597

Weaknesses
No CWEs

Credits

      @paul-gerste-sonarsource paul-gerste-sonarsource Reporter



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