ArchLinux: 201908-8: postgresql: multiple issues

    Date 12 Aug 2019
    633
    Posted By LinuxSecurity Advisories
    The package postgresql before version 11.5-1 is vulnerable to multiple issues including access restriction bypass and information disclosure.
    Arch Linux Security Advisory ASA-201908-8
    =========================================
    
    Severity: Medium
    Date    : 2019-08-10
    CVE-ID  : CVE-2019-10208 CVE-2019-10209
    Package : postgresql
    Type    : multiple issues
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-1019
    
    Summary
    =======
    
    The package postgresql before version 11.5-1 is vulnerable to multiple
    issues including access restriction bypass and information disclosure.
    
    Resolution
    ==========
    
    Upgrade to 11.5-1.
    
    # pacman -Syu "postgresql>=11.5-1"
    
    The problems have been fixed upstream in version 11.5.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    - CVE-2019-10208 (access restriction bypass)
    
    A security issue has been found in PostgreSQL < 11.5 where given a
    suitable SECURITY DEFINER function, an attacker can execute arbitrary
    SQL under the identity of the function owner. An attack requires
    EXECUTE permission on the function, which must itself contain a
    function call having inexact argument type match. For example,
    length('foo'::varchar) and length('foo') are inexact, while
    length('foo'::text) is exact. As part of exploiting this vulnerability,
    the attacker uses CREATE DOMAIN to create a type in a pg_temp schema.
    The attack pattern and fix are similar to that for CVE-2007-2138.
    
    - CVE-2019-10209 (information disclosure)
    
    An issue has been found in PostgreSQL >= 11.0 and < 11.5. In a database
    containing hypothetical, user-defined hash equality operators, an
    attacker could read arbitrary bytes of server memory. For an attack to
    become possible, a superuser would need to create unusual operators. It
    is possible for operators not purpose-crafted for attack to have the
    properties that enable an attack, but we are not aware of specific
    examples.
    
    Impact
    ======
    
    An authenticated attacker can read arbitrary bytes of server memory or
    execute arbitrary SQL commands under a different identity than its own.
    
    References
    ==========
    
    https://www.postgresql.org/about/news/1960/
    https://bugzilla.redhat.com/show_bug.cgi?id=1734416
    https://bugzilla.redhat.com/show_bug.cgi?id=1734447
    https://security.archlinux.org/CVE-2019-10208
    https://security.archlinux.org/CVE-2019-10209
    
    

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