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AUSCERT External Security Bulletin Redistribution
ESB-2019.3044
[DLA-1874-1] postgresql-9.4 security update
12 August 2019
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AusCERT Security Bulletin Summary
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Product: postgresql-9.4
Publisher: Debian
Operating System: Debian GNU/Linux 8
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-10208 CVE-2007-2138
Reference: ESB-2019.3043
ESB-2007.0277
Original Bulletin:
https://lists.debian.org/debian-lts-announce/2019/08/msg00007.html
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Package : postgresql-9.4
Version : 9.4.24-0+deb8u1
CVE ID : CVE-2019-10208
* CVE-2019-10208: `TYPE` in `pg_temp` executes arbitrary SQL during
`SECURITY DEFINER` execution
Versions Affected: 9.4 - 11
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.
Writing `SECURITY DEFINER` functions continues to require following the
considerations noted in the documentation:
https://www.postgresql.org/docs/devel/sql-createfunction.html#SQL-CREATEFUNCTION-SECURITY
The PostgreSQL project thanks Tom Lane for reporting this problem.
For Debian 8 "Jessie", this problem has been fixed in version
9.4.24-0+deb8u1.
We recommend that you upgrade your postgresql-9.4 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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