Remote DoS via search filters in slapi_filter_sprintf in slapd/util.c

A stack buffer overflow flaw was found in the way 389-ds-base handled certain LDAP search filters. A remote, unauthenticated attacker could potentially use this flaw to make ns-slapd crash via a specially crafted LDAP request, thus resulting in denial of service.
(CVE-2017-15134)

According to the version of the 389-ds-base packages installed, the EulerOS installation on the remote host is affected by the following vulnerability :

  - A stack buffer overflow flaw was found in the way     389-ds-base handled certain LDAP search filters. A     remote, unauthenticated attacker could potentially use     this flaw to make ns-slapd crash via a specially     crafted LDAP request, thus resulting in denial of     service. (CVE-2017-15134)

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

An update for 389-ds-base is now available for Red Hat Enterprise Linux 7.

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

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.

Security Fix(es) :

* A stack-based buffer overflow flaw was found in the way 389-ds-base handled certain LDAP search filters. A remote, unauthenticated attacker could potentially use this flaw to make ns-slapd crash via a specially crafted LDAP request, thus resulting in denial of service.
(CVE-2017-15134)

Bug Fix(es) :

* Previously, when a connection received a high operation rate, Directory Server stopped to poll the connection in certain situations.
As a consequence, new requests on the connection were not detected and processed. With this update, Directory Server correctly decides whether a connection has to be polled. As a result, connections with a high request rate no longer remain unprocessed. (BZ#1523505)

* Previously, if Directory Server was stopped during an operation which created additional changes in the memory changelog, the Replication Update Vector (RUV) in the changelog was higher than the RUV in the database. As a consequence, Directory Server recreated the changelog when the server started. With this update, the server now writes the highest RUV to the changelog only if there is the highest Change Sequence Number (CSN) present in it. As a result, the database and the changelog RUV are consistent and the server does not need recreating the changelog at start up. (BZ#1523507)

* Due to a bug, using a large number of Class of Service (CoS) templates in Directory Server increased the virtual attribute processing time. This update improves the structure of the CoS storage. As a result, using a large number of CoS templates no longer increases the virtual attribute processing time. (BZ#1526928)

Remote DoS via search filters in slapi_filter_sprintf in slapd/util.c

A stack buffer overflow flaw was found in the way 389-ds-base handled certain LDAP search filters. A remote, unauthenticated attacker could potentially use this flaw to make ns-slapd crash via a specially crafted LDAP request, thus resulting in denial of service.(CVE-2017-15134)

This update for 389-ds fixes the following issues :

The following security vulnerabilities were addressed :

  - CVE-2018-10850: Fixed a race condition on reference     counter that would lead to a denial of service using     persistent search (bsc#1096368)

  - CVE-2017-15134: Fixed a remote denial of service via     search filters in slapi_filter_sprintf in slapd/util.c     (bsc#1076530)

  - CVE-2017-15135: Fixed authentication bypass due to lack     of size check in slapi_ct_memcmp function in ch_malloc.c     (bsc#1076530)

  - CVE-2018-10935: Fixed an issue that allowed users to     cause a crash via ldapsearch with server side sorts     (bsc#1105606)

  - CVE-2018-14624: The lock controlling the error log was     not correctly used when re-opening the log file in     log__error_emergency(), allowing an attacker to send a     flood of modifications to a very large DN, which could     have caused slapd to crash (bsc#1106699).

This update was imported from the SUSE:SLE-15:Update update project.

CVE-2015-1854 A flaw was found while doing authorization of modrdn operations. An unauthenticated attacker able to issue an ldapmodrdn call to the directory server could perform unauthorized modifications of entries in the directory server.

CVE-2017-15134 Improper handling of a search filter in slapi_filter_sprintf() in slapd/util.c can lead to remote server crash and denial of service.

CVE-2018-1054 When read access on <attribute_name> is enabled, a flaw in SetUnicodeStringFromUTF_8 function in collate.c, can lead to out-of-bounds memory operations. This might result in a server crash, caused by unauthorized users.

CVE-2018-1089 Any user (anonymous or authenticated) can crash ns-slapd with a crafted ldapsearch query with very long filter value.

CVE-2018-10850 Due to a race condition the server could crash in turbo mode (because of high traffic) or when a worker reads several requests in the read buffer (more_data). Thus an anonymous attacker could trigger a denial of service.

For Debian 8 'Jessie', these problems have been fixed in version 1.3.3.5-4+deb8u1.

We recommend that you upgrade your 389-ds-base packages.

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

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2018:0163 advisory.

  - 389-ds-base: Remote DoS via search filters in slapi_filter_sprintf in slapd/util.c (CVE-2017-15134)

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

This update for 389-ds fixes the following issues :

The following security vulnerabilities were addressed :

CVE-2018-10850: Fixed a race condition on reference counter that would lead to a denial of service using persistent search (bsc#1096368)

CVE-2017-15134: Fixed a remote denial of service via search filters in slapi_filter_sprintf in slapd/util.c (bsc#1076530)

CVE-2017-15135: Fixed authentication bypass due to lack of size check in slapi_ct_memcmp function in ch_malloc.c (bsc#1076530)

CVE-2018-10935: Fixed an issue that allowed users to cause a crash via ldapsearch with server side sorts (bsc#1105606)

CVE-2018-14624: The lock controlling the error log was not correctly used when re-opening the log file in log__error_emergency(), allowing an attacker to send a flood of modifications to a very large DN, which could have caused slapd to crash (bsc#1106699).

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

Security Fix(es) :

  - A stack-based buffer overflow flaw was found in the way     389-ds-base handled certain LDAP search filters. A     remote, unauthenticated attacker could potentially use     this flaw to make ns-slapd crash via a specially crafted     LDAP request, thus resulting in denial of service.
    (CVE-2017-15134)

Bug Fix(es) :

  - Previously, when a connection received a high operation     rate, Directory Server stopped to poll the connection in     certain situations. As a consequence, new requests on     the connection were not detected and processed. With     this update, Directory Server correctly decides whether     a connection has to be polled. As a result, connections     with a high request rate no longer remain unprocessed.

  - Previously, if Directory Server was stopped during an     operation which created additional changes in the memory     changelog, the Replication Update Vector (RUV) in the     changelog was higher than the RUV in the database. As a     consequence, Directory Server recreated the changelog     when the server started. With this update, the server     now writes the highest RUV to the changelog only if     there is the highest Change Sequence Number (CSN)     present in it. As a result, the database and the     changelog RUV are consistent and the server does not     need recreating the changelog at start up.

  - Due to a bug, using a large number of Class of Service     (CoS) templates in Directory Server increased the     virtual attribute processing time. This update improves     the structure of the CoS storage. As a result, using a     large number of CoS templates no longer increases the     virtual attribute processing time.

From Red Hat Security Advisory 2018:0163 :

An update for 389-ds-base is now available for Red Hat Enterprise Linux 7.

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

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.

Security Fix(es) :

* A stack-based buffer overflow flaw was found in the way 389-ds-base handled certain LDAP search filters. A remote, unauthenticated attacker could potentially use this flaw to make ns-slapd crash via a specially crafted LDAP request, thus resulting in denial of service.
(CVE-2017-15134)

Bug Fix(es) :

* Previously, when a connection received a high operation rate, Directory Server stopped to poll the connection in certain situations.
As a consequence, new requests on the connection were not detected and processed. With this update, Directory Server correctly decides whether a connection has to be polled. As a result, connections with a high request rate no longer remain unprocessed. (BZ#1523505)

* Previously, if Directory Server was stopped during an operation which created additional changes in the memory changelog, the Replication Update Vector (RUV) in the changelog was higher than the RUV in the database. As a consequence, Directory Server recreated the changelog when the server started. With this update, the server now writes the highest RUV to the changelog only if there is the highest Change Sequence Number (CSN) present in it. As a result, the database and the changelog RUV are consistent and the server does not need recreating the changelog at start up. (BZ#1523507)

* Due to a bug, using a large number of Class of Service (CoS) templates in Directory Server increased the virtual attribute processing time. This update improves the structure of the CoS storage. As a result, using a large number of CoS templates no longer increases the virtual attribute processing time. (BZ#1526928)

The remote NewStart CGSL host, running version MAIN 5.04, has 389-ds-base packages installed that are affected by multiple vulnerabilities:

  - An out-of-bounds memory read flaw was found in the way     389-ds-base handled certain LDAP search filters. A     remote, unauthenticated attacker could potentially use     this flaw to make ns-slapd crash via a specially crafted     LDAP request, thus resulting in denial of service.
    (CVE-2018-1054)

  - It was found that 389-ds-base did not always handle     internal hash comparison operations correctly during the     authentication process. A remote, unauthenticated     attacker could potentially use this flaw to bypass the     authentication process under very rare and specific     circumstances. (CVE-2017-15135)

  - A stack buffer overflow flaw was found in the way     389-ds-base handled certain LDAP search filters. A     remote, unauthenticated attacker could potentially use     this flaw to make ns-slapd crash via a specially crafted     LDAP request, thus resulting in denial of service.
    (CVE-2017-15134)

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	Published	Updated	Severity
109126	Amazon Linux 2 : 389-ds-base (ALAS-2018-955)	Nessus	Amazon Linux Local Security Checks	4/18/2018	4/18/2018	high
106760	EulerOS 2.0 SP1 : 389-ds-base (EulerOS-SA-2018-1032)	Nessus	Huawei Local Security Checks	2/13/2018	1/6/2021	high
106355	CentOS 7 : 389-ds-base (CESA-2018:0163)	Nessus	CentOS Local Security Checks	1/26/2018	12/31/2019	high
106932	Amazon Linux AMI : 389-ds-base (ALAS-2018-955)	Nessus	Amazon Linux Local Security Checks	2/22/2018	4/18/2018	high
125210	openSUSE Security Update : 389-ds (openSUSE-2019-1397)	Nessus	SuSE Local Security Checks	5/16/2019	1/19/2021	high
106761	EulerOS 2.0 SP2 : 389-ds-base (EulerOS-SA-2018-1033)	Nessus	Huawei Local Security Checks	2/13/2018	1/6/2021	high
111086	Debian DLA-1428-1 : 389-ds-base security update	Nessus	Debian Local Security Checks	7/16/2018	1/11/2021	high
106333	RHEL 7 : 389-ds-base (RHSA-2018:0163)	Nessus	Red Hat Local Security Checks	1/25/2018	4/27/2024	high
124855	SUSE SLED15 / SLES15 Security Update : 389-ds (SUSE-SU-2019:1207-1)	Nessus	SuSE Local Security Checks	5/13/2019	1/13/2021	high
106338	Scientific Linux Security Update : 389-ds-base on SL7.x x86_64 (20180125)	Nessus	Scientific Linux Local Security Checks	1/25/2018	2/24/2020	high
106366	Oracle Linux 7 : 389-ds-base (ELSA-2018-0163)	Nessus	Oracle Linux Local Security Checks	1/26/2018	9/27/2019	high
127155	NewStart CGSL MAIN 5.04 : 389-ds-base Multiple Vulnerabilities (NS-SA-2019-0009)	Nessus	NewStart CGSL Local Security Checks	8/12/2019	1/14/2021	high
126439	SUSE SLED15 / SLES15 Security Update : 389-ds (SUSE-SU-2019:1207-2)	Nessus	SuSE Local Security Checks	7/2/2019	5/13/2024	high

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