slapd/connection.c in 389 Directory Server (formerly Fedora Directory Server) 1.3.4.x before 1.3.4.7 allows remote attackers to cause a denial of service (infinite loop and connection blocking) by leveraging an abnormally closed connection.

This update for 389-ds fixes the following issues :

  - CVE-2017-7551: 389-ds-base: Password brute-force     possible for locked account due to different return     codes (bsc#1051997)

  - CVE-2016-4992: 389-ds: Information disclosure via     repeated use of LDAP ADD operation (bsc#997256)

  - CVE-2016-5405: 389-ds: Password verification vulnerable     to timing attack (bsc#1007004)

  - CVE-2017-2591: 389-ds-base: Heap buffer overflow in     uiduniq.c (bsc#1020670)

  - CVE-2017-2668 389-ds Remote crash via crafted LDAP     messages (bsc#1069067)

  - CVE-2016-0741: 389-ds: worker threads do not detect     abnormally closed connections causing DoS (bsc#1069074)

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).

Release 1.3.4.8

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

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 occurs.

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

Updated 389-ds-base packages that fix one security issue and several bugs are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The 389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.

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. (BZ#1290725)

* 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. (BZ#1290726)

* 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. (BZ#1295684)

* 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. (BZ#1298105)

* 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 occurs. (BZ#1299346)

Users of 389-ds-base are advised to upgrade to these updated packages, which correct these issues. After installing this update, the 389 server service will be restarted automatically.

The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2016-0204 advisory.

    - Resolves: bug 1299757 - CVE-2016-0741 389-ds-base: Worker threads do not detect abnormally closed     connections causing DoS

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
105366	openSUSE Security Update : 389-ds (openSUSE-2017-1396)	Nessus	SuSE Local Security Checks	critical
89845	Amazon Linux AMI : 389-ds-base (ALAS-2016-664)	Nessus	Amazon Linux Local Security Checks	high
89797	Fedora 23 : 389-ds-base-1.3.4.8-1.fc23 (2016-40401300ed)	Nessus	Fedora Local Security Checks	high
89795	Fedora 22 : 389-ds-base-1.3.4.8-1.fc22 (2016-0609474cf6)	Nessus	Fedora Local Security Checks	high
88795	Scientific Linux Security Update : 389-ds-base on SL7.x x86_64 (20160216)	Nessus	Scientific Linux Local Security Checks	high
88790	RHEL 7 : 389-ds-base (RHSA-2016:0204)	Nessus	Red Hat Local Security Checks	high
88782	Oracle Linux 7 : 389-ds-base (ELSA-2016-0204)	Nessus	Oracle Linux Local Security Checks	high
88763	CentOS 7 : 389-ds-base (CESA-2016:0204)	Nessus	CentOS Local Security Checks	high

Detections

Analytics

CVE-2016-0741

high

Tenable Plugins

critical

high

high

high

high

high

high

high