Bug 1448086 (CVE-2017-7485) - CVE-2017-7485 postgresql: libpq ignores PGREQUIRESSL environment variable
Summary: CVE-2017-7485 postgresql: libpq ignores PGREQUIRESSL environment variable
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-7485
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1449699 1449701 1449704 1449705 1450115 1450116 1450117
Blocks: 1448091
TreeView+ depends on / blocked
 
Reported: 2017-05-04 13:46 UTC by Adam Mariš
Modified: 2021-02-17 02:11 UTC (History)
31 users (show)

Fixed In Version: postgresql 9.2.21, postgresql 9.3.17, postgresql 9.4.12, postgresql 9.5.7, postgresql 9.6.3
Doc Type: If docs needed, set a value
Doc Text:
It was discovered that the PostgreSQL client library (libpq) did not enforce the use of TLS/SSL for a connection to a PostgreSQL server when the PGREQUIRESSL environment variable was set. An man-in-the-middle attacker could use this flaw to strip the SSL/TLS protection from a connection between a client and a server.
Clone Of:
Environment:
Last Closed: 2017-07-07 11:21:40 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1677 0 normal SHIPPED_LIVE Moderate: rh-postgresql95-postgresql security update 2017-07-05 09:44:17 UTC
Red Hat Product Errata RHSA-2017:1678 0 normal SHIPPED_LIVE Moderate: rh-postgresql94-postgresql security update 2017-07-05 09:54:19 UTC
Red Hat Product Errata RHSA-2017:1838 0 normal SHIPPED_LIVE Moderate: rh-postgresql95-postgresql security update 2017-07-31 19:52:01 UTC
Red Hat Product Errata RHSA-2017:2425 0 normal SHIPPED_LIVE Moderate: rh-postgresql95-postgresql security update 2017-08-07 20:11:22 UTC

Description Adam Mariš 2017-05-04 13:46:35 UTC 
Documentation asserts that, given this variable, libpq will attempt SSL connections only. Instead, libpq ignores the variable and attempts a non-SSL connection after an SSL connection fails. (libpq is a prominent programming interface for PostgreSQL clients.) An attacker intercepting session startup could compel use of a non-SSL connection, then record or modify the remainder of the session. The long-preferred PGSSLMODE environment variable does not have this problem and provides strictly more control.

Affected versions: 9.3 - 9.6
Comment 1 Adam Mariš 2017-05-04 13:46:51 UTC 
Acknowledgments:

Name: the PostgreSQL project
Upstream: Daniel Gustafsson
Comment 2 Cedric Buissart 2017-05-10 07:31:56 UTC 
Upstream patch : 
* Restore PGREQUIRESSL recognition in libpq.
https://github.com/postgres/postgres/commit/0170b10
Comment 4 Cedric Buissart 2017-05-10 13:52:53 UTC 
Mitigation:

Use  PGSSLMODE=require instead of  PGREQUIRESSL=1
Comment 6 Adam Mariš 2017-05-11 14:38:48 UTC 
External References:

https://www.postgresql.org/about/news/1746/
Comment 7 Adam Mariš 2017-05-11 14:47:12 UTC 
Created mingw-postgresql tracking bugs for this issue:

Affects: epel-7 [bug 1450116]
Affects: fedora-all [bug 1450117]


Created postgresql tracking bugs for this issue:

Affects: fedora-all [bug 1450115]
Comment 9 errata-xmlrpc 2017-07-05 05:45:27 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS

Via RHSA-2017:1677 https://access.redhat.com/errata/RHSA-2017:1677
Comment 10 errata-xmlrpc 2017-07-05 05:55:26 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS

Via RHSA-2017:1678 https://access.redhat.com/errata/RHSA-2017:1678
Comment 11 errata-xmlrpc 2017-07-31 15:52:56 UTC 
This issue has been addressed in the following products:

  Red Hat Satellite 5.8
  Red Hat Satellite 5.8 ELS

Via RHSA-2017:1838 https://access.redhat.com/errata/RHSA-2017:1838
Comment 12 errata-xmlrpc 2017-08-07 16:13:01 UTC 
This issue has been addressed in the following products:

  Red Hat Satellite 5.7

Via RHSA-2017:2425 https://access.redhat.com/errata/RHSA-2017:2425
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