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Related Vulnerabilities: CVE-2017-7484 CVE-2017-7486

Selectivity estimators bypass SELECT privilege checksIt was found that some selectivity estimation functions did not check user privileges before providing information from pg_statistic, possibly leaking information. An unprivileged attacker could use this flaw to steal some information from tables they are otherwise not allowed to access. (CVE-2017-7484) pg_user_mappings view discloses foreign server passwordsIt was found that the pg_user_mappings view from postgresql could disclose information about user mappings to a foreign database to unprivileged users. An authenticated attacker with USAGE privilege for this mapping could, when querying the view, obtain user mapping data, such as the username and password used to connect to the foreign database. (CVE-2017-7486 )

Source

ALAS-2017-838

Amazon Linux AMI Security Advisory: ALAS-2017-838
Advisory Release Date: 2017-06-06 16:53 Pacific
Advisory Updated Date: 2017-06-06 22:45 Pacific

Severity: Medium

References: CVE-2017-7484 CVE-2017-7486

Issue Overview:

Selectivity estimators bypass SELECT privilege checks
It was found that some selectivity estimation functions did not check user privileges before providing information from pg_statistic, possibly leaking information. An unprivileged attacker could use this flaw to steal some information from tables they are otherwise not allowed to access. (CVE-2017-7484)

pg_user_mappings view discloses foreign server passwords
It was found that the pg_user_mappings view from postgresql could disclose information about user mappings to a foreign database to unprivileged users. An authenticated attacker with USAGE privilege for this mapping could, when querying the view, obtain user mapping data, such as the username and password used to connect to the foreign database. (CVE-2017-7486 )

Affected Packages:

postgresql92

Issue Correction:
Run yum update postgresql92 to update your system.

New Packages:

i686:
    postgresql92-plperl-9.2.21-1.60.amzn1.i686
    postgresql92-server-9.2.21-1.60.amzn1.i686
    postgresql92-libs-9.2.21-1.60.amzn1.i686
    postgresql92-9.2.21-1.60.amzn1.i686
    postgresql92-plpython26-9.2.21-1.60.amzn1.i686
    postgresql92-pltcl-9.2.21-1.60.amzn1.i686
    postgresql92-docs-9.2.21-1.60.amzn1.i686
    postgresql92-contrib-9.2.21-1.60.amzn1.i686
    postgresql92-debuginfo-9.2.21-1.60.amzn1.i686
    postgresql92-server-compat-9.2.21-1.60.amzn1.i686
    postgresql92-plpython27-9.2.21-1.60.amzn1.i686
    postgresql92-devel-9.2.21-1.60.amzn1.i686
    postgresql92-test-9.2.21-1.60.amzn1.i686

src:
    postgresql92-9.2.21-1.60.amzn1.src

x86_64:
    postgresql92-plperl-9.2.21-1.60.amzn1.x86_64
    postgresql92-libs-9.2.21-1.60.amzn1.x86_64
    postgresql92-pltcl-9.2.21-1.60.amzn1.x86_64
    postgresql92-plpython26-9.2.21-1.60.amzn1.x86_64
    postgresql92-test-9.2.21-1.60.amzn1.x86_64
    postgresql92-server-9.2.21-1.60.amzn1.x86_64
    postgresql92-9.2.21-1.60.amzn1.x86_64
    postgresql92-plpython27-9.2.21-1.60.amzn1.x86_64
    postgresql92-debuginfo-9.2.21-1.60.amzn1.x86_64
    postgresql92-server-compat-9.2.21-1.60.amzn1.x86_64
    postgresql92-contrib-9.2.21-1.60.amzn1.x86_64
    postgresql92-devel-9.2.21-1.60.amzn1.x86_64
    postgresql92-docs-9.2.21-1.60.amzn1.x86_64

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ALAS-2017-838

ALAS-2017-838

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