Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges
Andrew Wheelwright discovered that user mappings were insufficiently
restricted.
CVE-2017-7546
In some authentication methods empty passwords were accepted.
CVE-2017-7547
User mappings could leak data to unprivileged users.
For Debian 7 "Wheezy", these problems have been fixed in version
9.1.24lts2-0+deb7u1.
We recommend that you upgrade your postgresql-9.1 packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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