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Category:   Application (Database)  >   PostgreSQL Vendors:   postgresql.org
PostgreSQL Bugs Let Remote Users Bypass Authentication in Certain Cases and Let Remote Authenticated Users Obtain Passwords and Deny Service
SecurityTracker Alert ID:  1039142
SecurityTracker URL:  http://securitytracker.com/id/1039142
CVE Reference:   CVE-2017-7546, CVE-2017-7547, CVE-2017-7548   (Links to External Site)
Updated:  Sep 11 2017
Original Entry Date:  Aug 11 2017
Impact:   Denial of service via network, Disclosure of authentication information, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Several vulnerabilities were reported in PostgreSQL. A remote authenticated user can cause denial of service conditions. A remote authenticated user can obtain passwords on the target system. A remote user can gain access to the target system.

Because libpq and libpq-based connection drivers do not send empty password values to the server during an authentication attempt, setting a target user's password to an empty value effectively disables password authentication for the target user's account when using those specific connection drivers. However, other connection drivers that are not based on libpq may forward an empty password, allowing a remote user to supply an empty password to access the target user's account for accounts that have set an empty password value [CVE-2017-7546].

A remote authenticated user can exploit a flaw in the the foreign data wrapper functionality to view passwords in the pg_user_mappings catalog view [CVE-2017-7547].

A remote authenticated user can exploit an access control flaw in the lo_put() function to change the data in a large object and cause denial of service conditions [CVE-2017-7548].

Chapman Flack, Jeff Janes, Ben de Graaff, Jelte Fennema, and Jeroen van der Ham reported these vulnerabilities.

Impact:   A remote authenticated user can cause denial of service conditions.

A remote authenticated user can obtain passwords on the target system.

A remote user can gain access to the target database in certain cases.

Solution:   The vendor has issued a fix (9.2.22, 9.3.18, 9.4.13, 9.5.8, 9.6.4).

[Editor's note: Manual steps are required after applying the fix to fully address the CVE-2017-7547 vulnerability.]

The vendor advisory is available at:

https://www.postgresql.org/about/news/1772/

Vendor URL:  www.postgresql.org/about/news/1772/ (Links to External Site)
Cause:   Access control error, Authentication error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 15 2017 (Ubuntu Issues Fix) PostgreSQL Bugs Let Remote Users Bypass Authentication in Certain Cases and Let Remote Authenticated Users Obtain Passwords and Deny Service
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS, 16.04 LTS, and 17.04.
Sep 14 2017 (Red Hat Issues Fix) PostgreSQL Bugs Let Remote Users Bypass Authentication in Certain Cases and Let Remote Authenticated Users Obtain Passwords and Deny Service
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Sep 15 2017 (Oracle Issues Fix for Oracle Linux) PostgreSQL Bugs Let Remote Users Bypass Authentication in Certain Cases and Let Remote Authenticated Users Obtain Passwords and Deny Service
Oracle has issued a fix for Oracle Linux 7.



 Source Message Contents

Subject:  https://www.postgresql.org/about/news/1772/

 
 


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