Vulnerabilities > CVE-2018-14648 - Resource Exhaustion vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
A flaw was found in 389 Directory Server. A specially crafted search query could lead to excessive CPU consumption in the do_search() function. An unauthenticated attacker could use this flaw to provoke a denial of service.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- XML Ping of the Death An attacker initiates a resource depletion attack where a large number of small XML messages are delivered at a sufficiently rapid rate to cause a denial of service or crash of the target. Transactions such as repetitive SOAP transactions can deplete resources faster than a simple flooding attack because of the additional resources used by the SOAP protocol and the resources necessary to process SOAP messages. The transactions used are immaterial as long as they cause resource utilization on the target. In other words, this is a normal flooding attack augmented by using messages that will require extra processing on the target.
- XML Entity Expansion An attacker submits an XML document to a target application where the XML document uses nested entity expansion to produce an excessively large output XML. XML allows the definition of macro-like structures that can be used to simplify the creation of complex structures. However, this capability can be abused to create excessive demands on a processor's CPU and memory. A small number of nested expansions can result in an exponential growth in demands on memory.
- Inducing Account Lockout An attacker leverages the security functionality of the system aimed at thwarting potential attacks to launch a denial of service attack against a legitimate system user. Many systems, for instance, implement a password throttling mechanism that locks an account after a certain number of incorrect log in attempts. An attacker can leverage this throttling mechanism to lock a legitimate user out of their own account. The weakness that is being leveraged by an attacker is the very security feature that has been put in place to counteract attacks.
- Violating Implicit Assumptions Regarding XML Content (aka XML Denial of Service (XDoS)) XML Denial of Service (XDoS) can be applied to any technology that utilizes XML data. This is, of course, most distributed systems technology including Java, .Net, databases, and so on. XDoS is most closely associated with web services, SOAP, and Rest, because remote service requesters can post malicious XML payloads to the service provider designed to exhaust the service provider's memory, CPU, and/or disk space. The main weakness in XDoS is that the service provider generally must inspect, parse, and validate the XML messages to determine routing, workflow, security considerations, and so on. It is exactly these inspection, parsing, and validation routines that XDoS targets. There are three primary attack vectors that XDoS can navigate Target CPU through recursion: attacker creates a recursive payload and sends to service provider Target memory through jumbo payloads: service provider uses DOM to parse XML. DOM creates in memory representation of XML document, but when document is very large (for example, north of 1 Gb) service provider host may exhaust memory trying to build memory objects. XML Ping of death: attack service provider with numerous small files that clog the system. All of the above attacks exploit the loosely coupled nature of web services, where the service provider has little to no control over the service requester and any messages the service requester sends.
Nessus
NASL family Amazon Linux Local Security Checks NASL id AL2_ALAS-2018-1106.NASL description It was found that a specially crafted search query could lead to excessive CPU consumption in the do_search() function. An unauthenticated attacker could use this flaw to provoke a denial of service.(CVE-2018-14648) last seen 2020-06-01 modified 2020-06-02 plugin id 118959 published 2018-11-15 reporter This script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/118959 title Amazon Linux 2 : 389-ds-base (ALAS-2018-1106) code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Amazon Linux 2 Security Advisory ALAS-2018-1106. # include("compat.inc"); if (description) { script_id(118959); script_version("1.2"); script_cvs_date("Date: 2018/11/29 12:03:38"); script_cve_id("CVE-2018-14648"); script_xref(name:"ALAS", value:"2018-1106"); script_name(english:"Amazon Linux 2 : 389-ds-base (ALAS-2018-1106)"); script_summary(english:"Checks rpm output for the updated packages"); script_set_attribute( attribute:"synopsis", value:"The remote Amazon Linux 2 host is missing a security update." ); script_set_attribute( attribute:"description", value: "It was found that a specially crafted search query could lead to excessive CPU consumption in the do_search() function. An unauthenticated attacker could use this flaw to provoke a denial of service.(CVE-2018-14648)" ); script_set_attribute( attribute:"see_also", value:"https://alas.aws.amazon.com/AL2/ALAS-2018-1106.html" ); script_set_attribute( attribute:"solution", value:"Run 'yum update 389-ds-base' to update your system." ); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:389-ds-base"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:389-ds-base-debuginfo"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:389-ds-base-devel"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:389-ds-base-libs"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:389-ds-base-snmp"); script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2"); script_set_attribute(attribute:"patch_publication_date", value:"2018/11/15"); script_set_attribute(attribute:"plugin_publication_date", value:"2018/11/15"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"Amazon Linux Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("rpm.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); release = get_kb_item("Host/AmazonLinux/release"); if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux"); os_ver = pregmatch(pattern: "^AL(A|\d)", string:release); if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux"); os_ver = os_ver[1]; if (os_ver != "2") { if (os_ver == 'A') os_ver = 'AMI'; audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver); } if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); flag = 0; if (rpm_check(release:"AL2", reference:"389-ds-base-1.3.8.4-15.amzn2.0.1")) flag++; if (rpm_check(release:"AL2", reference:"389-ds-base-debuginfo-1.3.8.4-15.amzn2.0.1")) flag++; if (rpm_check(release:"AL2", reference:"389-ds-base-devel-1.3.8.4-15.amzn2.0.1")) flag++; if (rpm_check(release:"AL2", reference:"389-ds-base-libs-1.3.8.4-15.amzn2.0.1")) flag++; if (rpm_check(release:"AL2", reference:"389-ds-base-snmp-1.3.8.4-15.amzn2.0.1")) flag++; if (flag) { if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get()); else security_hole(0); exit(0); } else { tested = pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "389-ds-base / 389-ds-base-debuginfo / 389-ds-base-devel / etc"); }NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2018-3127.NASL description From Red Hat Security Advisory 2018:3127 : 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. The following packages have been upgraded to a later upstream version: 389-ds-base (1.3.8.4). (BZ#1560653) Security Fix(es) : * 389-ds-base: Mishandled search requests in servers/slapd/search.c:do_search () allows for denial of service (CVE-2018-14648) 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. Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 118774 published 2018-11-07 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/118774 title Oracle Linux 7 : 389-ds-base (ELSA-2018-3127) NASL family SuSE Local Security Checks NASL id SUSE_SU-2019-2155-1.NASL description 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. last seen 2020-06-01 modified 2020-06-02 plugin id 128021 published 2019-08-20 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/128021 title SUSE SLED15 / SLES15 Security Update : 389-ds (SUSE-SU-2019:2155-1) NASL family NewStart CGSL Local Security Checks NASL id NEWSTART_CGSL_NS-SA-2019-0062_389-DS-BASE.NASL description The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has 389-ds-base packages installed that are affected by a vulnerability: - It was found that a specially crafted search query could lead to excessive CPU consumption in the do_search() function. An unauthenticated attacker could use this flaw to provoke a denial of service. (CVE-2018-14648) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-06-01 modified 2020-06-02 plugin id 127256 published 2019-08-12 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/127256 title NewStart CGSL CORE 5.04 / MAIN 5.04 : 389-ds-base Vulnerability (NS-SA-2019-0062) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2018-1439.NASL description According to the version of the 389-ds-base packages installed, the EulerOS installation on the remote host is affected by the following vulnerability : - 389-ds-base: Mishandled search requests in servers/slapd/search.c:do_search() allows for denial of service (CVE-2018-14648) 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. last seen 2020-05-06 modified 2018-12-28 plugin id 119928 published 2018-12-28 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119928 title EulerOS 2.0 SP2 : 389-ds-base (EulerOS-SA-2018-1439) NASL family Amazon Linux Local Security Checks NASL id ALA_ALAS-2018-1106.NASL description It was found that a specially crafted search query could lead to excessive CPU consumption in the do_search() function. An unauthenticated attacker could use this flaw to provoke a denial of service.(CVE-2018-14648) last seen 2020-06-10 modified 2018-12-07 plugin id 119465 published 2018-12-07 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119465 title Amazon Linux AMI : 389-ds-base (ALAS-2018-1106) NASL family Scientific Linux Local Security Checks NASL id SL_20181030_389_DS_BASE_ON_SL7_X.NASL description Security Fix(es) : - 389-ds-base: Mishandled search requests in servers/slapd/search.c:do_search() allows for denial of service (CVE-2018-14648) last seen 2020-03-18 modified 2018-11-27 plugin id 119176 published 2018-11-27 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119176 title Scientific Linux Security Update : 389-ds-base on SL7.x x86_64 (20181030) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2019-1789.NASL description An update for 389-ds-base is now available for Red Hat Enterprise Linux 7.5 Extended Update Support. 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) : * 389-ds-base: Insufficient fix for CVE-2018-14648 Denial of Service in RHEL-7.5 (CVE-2019-10171) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 126757 published 2019-07-17 reporter This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/126757 title RHEL 7 : 389-ds-base (RHSA-2019:1789) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2018-3507.NASL description An update for 389-ds-base is now available for Red Hat Enterprise Linux 7.5 Extended Update Support. 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: Mishandled search requests in servers/slapd/search.c:do_search () allows for denial of service (CVE-2018-14648) 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. Bug Fix(es) : * Previously, the *Pass-through* plug-in in Directory Server did not support encrypted connections if the encryption was started using the *STARTTLS* command. The problem has been fixed, and the *Pass-through* plug-in now supports connections that use the *STARTTLS* command. (BZ#1635138) last seen 2020-06-01 modified 2020-06-02 plugin id 118792 published 2018-11-07 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/118792 title RHEL 7 : 389-ds-base (RHSA-2018:3507) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2018-3127.NASL description 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. The following packages have been upgraded to a later upstream version: 389-ds-base (1.3.8.4). (BZ#1560653) Security Fix(es) : * 389-ds-base: Mishandled search requests in servers/slapd/search.c:do_search () allows for denial of service (CVE-2018-14648) 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. Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 118531 published 2018-10-31 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/118531 title RHEL 7 : 389-ds-base (RHSA-2018:3127) NASL family Huawei Local Security Checks NASL id EULEROS_SA-2018-1440.NASL description According to the version of the 389-ds-base packages installed, the EulerOS installation on the remote host is affected by the following vulnerability : - 389-ds-base: Mishandled search requests in servers/slapd/search.c:do_search() allows for denial of service (CVE-2018-14648) 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. last seen 2020-05-06 modified 2018-12-28 plugin id 119929 published 2018-12-28 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119929 title EulerOS 2.0 SP3 : 389-ds-base (EulerOS-SA-2018-1440) NASL family Debian Local Security Checks NASL id DEBIAN_DLA-1554.NASL description A regression was found in the recent security update for 389-ds-base (the 389 Directory Server), announced as DLA-1554-2, caused by an incomplete fix for CVE-2018-14648. The regression caused the server to crash when processing requests with empty attributes. For Debian 8 last seen 2020-06-01 modified 2020-06-02 plugin id 118407 published 2018-10-26 reporter This script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/118407 title Debian DLA-1554-2 : 389-ds-base regression update NASL family CentOS Local Security Checks NASL id CENTOS_RHSA-2018-3127.NASL description 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. The following packages have been upgraded to a later upstream version: 389-ds-base (1.3.8.4). (BZ#1560653) Security Fix(es) : * 389-ds-base: Mishandled search requests in servers/slapd/search.c:do_search () allows for denial of service (CVE-2018-14648) 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. Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section. last seen 2020-06-01 modified 2020-06-02 plugin id 118994 published 2018-11-16 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/118994 title CentOS 7 : 389-ds-base (CESA-2018:3127)
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References
- https://access.redhat.com/errata/RHSA-2018:3127
- https://access.redhat.com/errata/RHSA-2018:3507
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14648
- https://lists.debian.org/debian-lts-announce/2018/10/msg00015.html
- https://access.redhat.com/errata/RHSA-2018:3127
- https://lists.debian.org/debian-lts-announce/2018/10/msg00015.html
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14648
- https://access.redhat.com/errata/RHSA-2018:3507