5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 High
AI Score
Confidence
High
0.243 Low
EPSS
Percentile
96.6%
A vulnerability in the Certificate List Exact Assertion validation was discovered in OpenLDAP, a free implementation of the Lightweight Directory Access Protocol. An unauthenticated remote attacker can take advantage of this flaw to cause a denial of service (slapd daemon crash) via specially crafted packets.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DSA-4860. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('compat.inc');
if (description)
{
script_id(146786);
script_version("1.3");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/19");
script_cve_id("CVE-2021-27212");
script_xref(name:"DSA", value:"4860");
script_name(english:"Debian DSA-4860-1 : openldap - security update");
script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
script_set_attribute(attribute:"description", value:
"A vulnerability in the Certificate List Exact Assertion validation was
discovered in OpenLDAP, a free implementation of the Lightweight
Directory Access Protocol. An unauthenticated remote attacker can take
advantage of this flaw to cause a denial of service (slapd daemon
crash) via specially crafted packets.");
script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/openldap");
script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/openldap");
script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2021/dsa-4860");
script_set_attribute(attribute:"solution", value:
"Upgrade the openldap packages.
For the stable distribution (buster), this problem has been fixed in
version 2.4.47+dfsg-3+deb10u6.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC: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_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-27212");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/02/14");
script_set_attribute(attribute:"patch_publication_date", value:"2021/02/20");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/02/23");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:openldap");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Debian Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");
exit(0);
}
include("audit.inc");
include("debian_package.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (deb_check(release:"10.0", prefix:"ldap-utils", reference:"2.4.47+dfsg-3+deb10u6")) flag++;
if (deb_check(release:"10.0", prefix:"libldap-2.4-2", reference:"2.4.47+dfsg-3+deb10u6")) flag++;
if (deb_check(release:"10.0", prefix:"libldap-common", reference:"2.4.47+dfsg-3+deb10u6")) flag++;
if (deb_check(release:"10.0", prefix:"libldap2-dev", reference:"2.4.47+dfsg-3+deb10u6")) flag++;
if (deb_check(release:"10.0", prefix:"slapd", reference:"2.4.47+dfsg-3+deb10u6")) flag++;
if (deb_check(release:"10.0", prefix:"slapd-contrib", reference:"2.4.47+dfsg-3+deb10u6")) flag++;
if (deb_check(release:"10.0", prefix:"slapd-smbk5pwd", reference:"2.4.47+dfsg-3+deb10u6")) flag++;
if (deb_check(release:"10.0", prefix:"slapi-dev", reference:"2.4.47+dfsg-3+deb10u6")) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
else security_warning(0);
exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
Vendor | Product | Version | CPE |
---|---|---|---|
debian | debian_linux | openldap | p-cpe:/a:debian:debian_linux:openldap |
debian | debian_linux | 10.0 | cpe:/o:debian:debian_linux:10.0 |
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 High
AI Score
Confidence
High
0.243 Low
EPSS
Percentile
96.6%