+++ This bug was initially created as a clone of Bug #150871 +++
Description of problem:
MySQL allows users with very low privileges to create user-defined
functions that reference code in loadable shared libraries. Obviously
this creates a risk of users being able to cause the server to execute
arbitrary code. There are some rather ad-hoc restrictions intended to
prevent misuse of the feature, but Stefano Di Paola found two
different ways to create problems anyway: you can call an arbitrary
function belonging to any standard system library, and you can
circumvent the check against giving an absolute path to a library.
Reported to vulnwatch.org by Stefano Di Paola on 11 Mar 2005
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. See vulnwatch reports.
This is fixed in 4.1.10a, which we should upgrade to anyway as it
contains numerous other bug fixes.
My personal opinion is that adding more ad-hoc restrictions will never
make this feature secure, and that MySQL will ultimately have to do
something like what PostgreSQL does with their equivalent feature, ie
allow only database superusers to define functions written in C.
We'll need to keep a close eye on this area.
I'm a bit confused. Can you verify is this affects mysql 3. I was under the
impression from your comments the other day that it does not.
The notice from MySQL AB said that it affected 4.0.x and later; I assumed from
that that 3.x didn't have the issue, which may have been overoptimistic. I'm
not sure that they are still supporting 3.x at all.
MySQL has now confirmed that the bugs also exist in 3.x, so we will need to do
something about a back-patch ... for both RHEL3 and AS2.1.
Back-patch created in mysql-3.23.58-15.RHEL3.1 for RHEL3 and
mysql-3.23.58-1.72.2 for AS2.1.
*** Bug 151733 has been marked as a duplicate of this bug. ***
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.
The errata release is incomplete for RHEL-3, and does not include a patched
On RHEL3, mysql-server is part of "Extras", see bug 152437 for tracking.