CVE-2017-7484 漏洞信息：Amazon Linux Security Advisory for postgresql92: ALAS-2017-838

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 )

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

Please refer to Amazon advisory ALAS-2017-838 for affected packages and patching details, or update with your package manager.

Patch:
Following are links for downloading patches to fix the vulnerabilities:

ALAS-2017-838: Amazon Linux (postgresql92 (9.2.21-1.60.amzn1) on i686)

ALAS-2017-838: Amazon Linux (postgresql92 (9.2.21-1.60.amzn1) on x86_64)

ALAS-2017-838: Amazon Linux (postgresql92 (9.2.21-1.60.amzn1) on src)