389-ds-base (SL7)

Synopsis: Important: 389-ds-base security and bug fix update
Advisory ID: SLSA-2016:0204-1
Issue Date: 2016-02-16
CVE Numbers: CVE-2016-0741

An infinite-loop vulnerability was discovered in the 389 directory server,
where the server failed to correctly handle unexpectedly closed client
connections. A remote attacker able to connect to the server could use
this flaw to make the directory server consume an excessive amount of CPU
and stop accepting connections (denial of service). (CVE-2016-0741)

This update fixes the following bugs:

* Previously, if a simple paged results search failed in the back end, the
simple paged results slot was not released. Consequently, the simple paged
results slots in a connection object could be accumulated. With this
update, the simple paged results slot is released correctly when a search
fails, and unused simple paged results slots are no longer left in a
connection object.

* Previously, when several values of the same attribute were deleted using
the ldapmodify command, and at least one of them was added again during
the same operation, the equality index was not updated. As a consequence,
an exact search for the re-added attribute value did not return the entry.
The logic of the index code has been modified to update the index if at
least one of the values in the entry changes, and the exact search for the
re-added attribute value now returns the correct entry.

* Prior to this update, when the cleanAllRUV task was running, a bogus
attrlist_replace error message was logged repeatedly due to a memory
corruption. With this update, the appropriate memory copy function memmove
is used, which fixes the memory corruption. As a result, the error
messages are no longer logged in this scenario.

* To fix a simple paged results bug, an exclusive lock on a connection was
previously added. This consequently caused a self deadlock in a particular
case. With this update, the exclusive lock on a connection has been
changed to the re-entrant type, and the self deadlock no longer occurs.

* Previously, an unnecessary lock was sometimes acquired on a connection
object, which could consequently cause a deadlock. A patch has been
applied to remove the unnecessary locking, and the deadlock no longer

After installing this update, the 389 server service will be restarted


– Scientific Linux Development Team