A flaw was found in 389-ds-base before version 1.3.8.4-13. The process ns-slapd crashes in delete_passwdPolicy function when persistent search connections are terminated unexpectedly leading to remote denial of service.

This update for 389-ds to version 1.4.0.26 fixes the following issues :

Security issues fixed :

CVE-2016-5416: Fixed an information disclosure where a anonymous user could read the default ACI (bsc#991201).

CVE-2018-1054: Fixed a denial of service via search filters in SetUnicodeStringFromUTF_8() (bsc#1083689).

CVE-2018-1089: Fixed a buffer overflow via large filter value (bsc#1092187).

CVE-2018-10871: Fixed an information disclosure in certain plugins leading to the disclosure of plaintext password to an privileged attackers (bsc#1099465).

CVE-2018-14638: Fixed a denial of service through a crash in delete_passwdPolicy () (bsc#1108674).

CVE-2018-14648: Fixed a denial of service caused by malformed values in search queries (bsc#1109609).

CVE-2018-10935: Fixed a denial of service related to ldapsearch with server side sort (bsc#1105606).

CVE-2019-3883: Fixed a denial of service caused by hanging LDAP requests over TLS (bsc#1132385).

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.

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

  - A race condition was found in the way 389-ds-base     handles persistent search, resulting in a crash if the     server is under load. An anonymous attacker could use     this flaw to trigger a denial of service.
    (CVE-2018-10850)

  - It was found that 389-ds-base did not properly handle     long search filters with characters needing escapes,     possibly leading to buffer overflows. 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-2018-1089)

  - A vulnerability was discovered in 389-ds-base. The lock     controlling the error log was not correctly used when     re-opening the log file in log__error_emergency(). An     attacker could send a flood of modifications to a very     large DN, which would cause slapd to crash.
    (CVE-2018-14624)

  - A double-free of a password policy structure was found     in the way slapd was handling certain errors during     persistent search. A unauthenticated attacker could use     this flaw to crash Directory Server. (CVE-2018-14638)

  - A flaw was found in the 389 Directory Server that allows     users to cause a crash in the LDAP server using     ldapsearch with server side sort. (CVE-2018-10935)

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

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

  - race condition on reference counter leads to DoS using     persistent search (CVE-2018-10850)

  - ldapsearch with server side sort allows users to cause     a crash (CVE-2018-10935)

  - Server crash through modify command with large DN     (CVE-2018-14624)

  - Crash in delete_passwdPolicy when persistent search     connections are terminated unexpectedly     (CVE-2018-14638)

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.

A vulnerability was discovered in 389-ds-base. The lock controlling the error log was not correctly used when re-opening the log file in log__error_emergency(). An attacker could send a flood of modifications to a very large DN, which would cause slapd to crash.(CVE-2018-14624)

A race condition was found in the way 389-ds-base handles persistent search, resulting in a crash if the server is under load. An anonymous attacker could use this flaw to trigger a denial of service.(CVE-2018-10850)

A double-free of a password policy structure was found in the way slapd was handling certain errors during persistent search. A unauthenticated attacker could use this flaw to crash Directory Server.(CVE-2018-14638)

A flaw was found in the 389 Directory Server that allows users to cause a crash in the LDAP server using ldapsearch with server side sort.(CVE-2018-10935)

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 Moderate. 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) :

* 389-ds-base: race condition on reference counter leads to DoS using persistent search (CVE-2018-10850)

* 389-ds-base: ldapsearch with server side sort allows users to cause a crash (CVE-2018-10935)

* 389-ds-base: Server crash through modify command with large DN (CVE-2018-14624)

* 389-ds-base: Crash in delete_passwdPolicy when persistent search connections are terminated unexpectedly (CVE-2018-14638)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

The CVE-2018-10850 issue was discovered by Thierry Bordaz (Red Hat) and the CVE-2018-14638 issue was discovered by Viktor Ashirov (Red Hat).

Bug Fix(es) :

* Previously, the nucn-stans framework was enabled by default in Directory Server, but the framework is not stable. As a consequence, deadlocks and file descriptor leaks could occur. This update changes the default value of the nsslapd-enable-nunc-stans parameter to 'off'.
As a result, Directory Server is now stable. (BZ#1614836)

* When a search evaluates the 'shadowAccount' entry, Directory Server adds the shadow attributes to the entry. If the fine-grained password policy is enabled, the 'shadowAccount' entry can contain its own 'pwdpolicysubentry' policy attribute. Previously, to retrieve this attribute, the server started an internal search for each 'shadowAccount' entry, which was unnecessary because the entry was already known to the server. With this update, Directory Server only starts internal searches if the entry is not known. As a result, the performance of searches, such as response time and throughput, is improved. (BZ#1615924)

Security Fix(es) :

  - 389-ds-base: race condition on reference counter leads     to DoS using persistent search (CVE-2018-10850)

  - 389-ds-base: ldapsearch with server side sort allows     users to cause a crash (CVE-2018-10935)

  - 389-ds-base: Server crash through modify command with     large DN (CVE-2018-14624)

  - 389-ds-base: Crash in delete_passwdPolicy when     persistent search connections are terminated     unexpectedly (CVE-2018-14638)

Bug Fix(es) :

  - Previously, the nucn-stans framework was enabled by     default in Directory Server, but the framework is not     stable. As a consequence, deadlocks and file descriptor     leaks could occur. This update changes the default value     of the nsslapd-enable-nunc-stans parameter to 'off'. As     a result, Directory Server is now stable.

  - When a search evaluates the 'shadowAccount' entry,     Directory Server adds the shadow attributes to the     entry. If the fine-grained password policy is enabled,     the 'shadowAccount' entry can contain its own     'pwdpolicysubentry' policy attribute. Previously, to     retrieve this attribute, the server started an internal     search for each 'shadowAccount' entry, which was     unnecessary because the entry was already known to the     server. With this update, Directory Server only starts     internal searches if the entry is not known. As a     result, the performance of searches, such as response     time and throughput, is improved.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:2757 advisory.

  - 389-ds-base: race condition on reference counter leads to DoS using persistent search (CVE-2018-10850)

  - 389-ds-base: ldapsearch with server side sort allows users to cause a crash (CVE-2018-10935)

  - 389-ds-base: Server crash through modify command with large DN (CVE-2018-14624)

  - 389-ds-base: Crash in delete_passwdPolicy when persistent search connections are terminated unexpectedly     (CVE-2018-14638)

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

From Red Hat Security Advisory 2018:2757 :

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 Moderate. 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) :

* 389-ds-base: race condition on reference counter leads to DoS using persistent search (CVE-2018-10850)

* 389-ds-base: ldapsearch with server side sort allows users to cause a crash (CVE-2018-10935)

* 389-ds-base: Server crash through modify command with large DN (CVE-2018-14624)

* 389-ds-base: Crash in delete_passwdPolicy when persistent search connections are terminated unexpectedly (CVE-2018-14638)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

The CVE-2018-10850 issue was discovered by Thierry Bordaz (Red Hat) and the CVE-2018-14638 issue was discovered by Viktor Ashirov (Red Hat).

Bug Fix(es) :

* Previously, the nucn-stans framework was enabled by default in Directory Server, but the framework is not stable. As a consequence, deadlocks and file descriptor leaks could occur. This update changes the default value of the nsslapd-enable-nunc-stans parameter to 'off'.
As a result, Directory Server is now stable. (BZ#1614836)

* When a search evaluates the 'shadowAccount' entry, Directory Server adds the shadow attributes to the entry. If the fine-grained password policy is enabled, the 'shadowAccount' entry can contain its own 'pwdpolicysubentry' policy attribute. Previously, to retrieve this attribute, the server started an internal search for each 'shadowAccount' entry, which was unnecessary because the entry was already known to the server. With this update, Directory Server only starts internal searches if the entry is not known. As a result, the performance of searches, such as response time and throughput, is improved. (BZ#1615924)

ID	Name	Product	Family	Severity
128021	SUSE SLED15 / SLES15 Security Update : 389-ds (SUSE-SU-2019:2155-1)	Nessus	SuSE Local Security Checks	high
127210	NewStart CGSL CORE 5.04 / MAIN 5.04 : 389-ds-base Multiple Vulnerabilities (NS-SA-2019-0038)	Nessus	NewStart CGSL Local Security Checks	high
118759	EulerOS 2.0 SP3 : 389-ds-base (EulerOS-SA-2018-1365)	Nessus	Huawei Local Security Checks	high
118401	Amazon Linux 2 : 389-ds-base (ALAS-2018-1094)	Nessus	Amazon Linux Local Security Checks	medium
118361	Amazon Linux AMI : 389-ds-base (ALAS-2018-1094)	Nessus	Amazon Linux Local Security Checks	medium
117830	CentOS 7 : 389-ds-base (CESA-2018:2757)	Nessus	CentOS Local Security Checks	medium
117785	Scientific Linux Security Update : 389-ds-base on SL7.x x86_64 (20180925)	Nessus	Scientific Linux Local Security Checks	medium
117774	RHEL 7 : 389-ds-base (RHSA-2018:2757)	Nessus	Red Hat Local Security Checks	high
117766	Oracle Linux 7 : 389-ds-base (ELSA-2018-2757)	Nessus	Oracle Linux Local Security Checks	medium

Detections

Analytics

CVE-2018-14638

high

Tenable Plugins

high

high

high

medium

medium

medium

medium

high

medium