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Bug 1448086 - (CVE-2017-7485) CVE-2017-7485 postgresql: libpq ignores PGREQUIRESSL environment variable
CVE-2017-7485 postgresql: libpq ignores PGREQUIRESSL environment variable
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20170511,repor...
: Security
Depends On: 1450116 1449699 1449701 1449704 1449705 1450115 1450117
Blocks: 1448091
  Show dependency tree / graph
 
Reported: 2017-05-04 09:46 EDT by Adam Mariš
Modified: 2017-08-07 12:13 EDT (History)
31 users (show)

See Also:
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.
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Clone Of:
Environment:
Last Closed: 2017-07-07 07:21:40 EDT
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Documentation: ---
CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1677 normal SHIPPED_LIVE Moderate: rh-postgresql95-postgresql security update 2017-07-05 05:44:17 EDT
Red Hat Product Errata RHSA-2017:1678 normal SHIPPED_LIVE Moderate: rh-postgresql94-postgresql security update 2017-07-05 05:54:19 EDT
Red Hat Product Errata RHSA-2017:1838 normal SHIPPED_LIVE Moderate: rh-postgresql95-postgresql security update 2017-07-31 15:52:01 EDT
Red Hat Product Errata RHSA-2017:2425 normal SHIPPED_LIVE Moderate: rh-postgresql95-postgresql security update 2017-08-07 16:11:22 EDT

  None (edit)
Description Adam Mariš 2017-05-04 09:46:35 EDT 
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 09:46:51 EDT 
Acknowledgments:

Name: the PostgreSQL project
Upstream: Daniel Gustafsson
Comment 2 Cedric Buissart 2017-05-10 03:31:56 EDT 
Upstream patch : 
* Restore PGREQUIRESSL recognition in libpq.
https://github.com/postgres/postgres/commit/0170b10
Comment 4 Cedric Buissart 2017-05-10 09:52:53 EDT 
Mitigation:

Use  PGSSLMODE=require instead of  PGREQUIRESSL=1
Comment 6 Adam Mariš 2017-05-11 10:38:48 EDT 
External References:

https://www.postgresql.org/about/news/1746/
Comment 7 Adam Mariš 2017-05-11 10:47:12 EDT 
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 01:45:27 EDT 
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 01:55:26 EDT 
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 11:52:56 EDT 
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 12:13:01 EDT 
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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