9.3 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.5 High
AI Score
Confidence
Low
0.007 Low
EPSS
Percentile
80.7%
The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:4545 advisory.
libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.
The following packages have been upgraded to a later upstream version: libssh (0.9.4). (BZ#1804797)
Security Fix(es):
* libssh: denial of service when handling AES-CTR (or DES) ciphers (CVE-2020-1730)
* libssh: unsanitized location in scp could lead to unwanted command execution (CVE-2019-14889)
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.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.3 Release Notes linked from the References section.
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2020:4545. The text
# itself is copyright (C) Red Hat, Inc.
##
include('compat.inc');
if (description)
{
script_id(142391);
script_version("1.11");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/04");
script_cve_id("CVE-2019-14889", "CVE-2020-1730");
script_xref(name:"IAVA", value:"2020-A-0203");
script_xref(name:"RHSA", value:"2020:4545");
script_name(english:"RHEL 8 : libssh (RHSA-2020:4545)");
script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2020:4545 advisory.
libssh is a library which implements the SSH protocol. It can be used to implement client and server
applications.
The following packages have been upgraded to a later upstream version: libssh (0.9.4). (BZ#1804797)
Security Fix(es):
* libssh: denial of service when handling AES-CTR (or DES) ciphers (CVE-2020-1730)
* libssh: unsanitized location in scp could lead to unwanted command execution (CVE-2019-14889)
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.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.3 Release Notes
linked from the References section.
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
# https://access.redhat.com/security/data/csaf/v2/advisories/2020/rhsa-2020_4545.json
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?159e9a3e");
# https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.3_release_notes/
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b7e37d18");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#moderate");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2020:4545");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1733914");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1772523");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1801998");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1804797");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1821339");
script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1849071");
script_set_attribute(attribute:"solution", value:
"Update the affected libssh, libssh-config and / or libssh-devel packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-14889");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_cwe_id(78, 476);
script_set_attribute(attribute:"vendor_severity", value:"Moderate");
script_set_attribute(attribute:"vuln_publication_date", value:"2019/12/10");
script_set_attribute(attribute:"patch_publication_date", value:"2020/11/04");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/11/04");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libssh");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libssh-config");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libssh-devel");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Red Hat Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl", "redhat_repos.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");
exit(0);
}
include('rpm.inc');
include('rhel.inc');
if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '8')) audit(AUDIT_OS_NOT, 'Red Hat 8.x', 'Red Hat ' + os_ver);
if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);
var constraints = [
{
'repo_relative_urls': [
'content/dist/rhel8/8.10/aarch64/appstream/debug',
'content/dist/rhel8/8.10/aarch64/appstream/os',
'content/dist/rhel8/8.10/aarch64/appstream/source/SRPMS',
'content/dist/rhel8/8.10/aarch64/baseos/debug',
'content/dist/rhel8/8.10/aarch64/baseos/os',
'content/dist/rhel8/8.10/aarch64/baseos/source/SRPMS',
'content/dist/rhel8/8.10/ppc64le/appstream/debug',
'content/dist/rhel8/8.10/ppc64le/appstream/os',
'content/dist/rhel8/8.10/ppc64le/appstream/source/SRPMS',
'content/dist/rhel8/8.10/ppc64le/baseos/debug',
'content/dist/rhel8/8.10/ppc64le/baseos/os',
'content/dist/rhel8/8.10/ppc64le/baseos/source/SRPMS',
'content/dist/rhel8/8.10/s390x/appstream/debug',
'content/dist/rhel8/8.10/s390x/appstream/os',
'content/dist/rhel8/8.10/s390x/appstream/source/SRPMS',
'content/dist/rhel8/8.10/s390x/baseos/debug',
'content/dist/rhel8/8.10/s390x/baseos/os',
'content/dist/rhel8/8.10/s390x/baseos/source/SRPMS',
'content/dist/rhel8/8.10/x86_64/appstream/debug',
'content/dist/rhel8/8.10/x86_64/appstream/os',
'content/dist/rhel8/8.10/x86_64/appstream/source/SRPMS',
'content/dist/rhel8/8.10/x86_64/baseos/debug',
'content/dist/rhel8/8.10/x86_64/baseos/os',
'content/dist/rhel8/8.10/x86_64/baseos/source/SRPMS',
'content/dist/rhel8/8.6/aarch64/appstream/debug',
'content/dist/rhel8/8.6/aarch64/appstream/os',
'content/dist/rhel8/8.6/aarch64/appstream/source/SRPMS',
'content/dist/rhel8/8.6/aarch64/baseos/debug',
'content/dist/rhel8/8.6/aarch64/baseos/os',
'content/dist/rhel8/8.6/aarch64/baseos/source/SRPMS',
'content/dist/rhel8/8.6/ppc64le/appstream/debug',
'content/dist/rhel8/8.6/ppc64le/appstream/os',
'content/dist/rhel8/8.6/ppc64le/appstream/source/SRPMS',
'content/dist/rhel8/8.6/ppc64le/baseos/debug',
'content/dist/rhel8/8.6/ppc64le/baseos/os',
'content/dist/rhel8/8.6/ppc64le/baseos/source/SRPMS',
'content/dist/rhel8/8.6/s390x/appstream/debug',
'content/dist/rhel8/8.6/s390x/appstream/os',
'content/dist/rhel8/8.6/s390x/appstream/source/SRPMS',
'content/dist/rhel8/8.6/s390x/baseos/debug',
'content/dist/rhel8/8.6/s390x/baseos/os',
'content/dist/rhel8/8.6/s390x/baseos/source/SRPMS',
'content/dist/rhel8/8.6/x86_64/appstream/debug',
'content/dist/rhel8/8.6/x86_64/appstream/os',
'content/dist/rhel8/8.6/x86_64/appstream/source/SRPMS',
'content/dist/rhel8/8.6/x86_64/baseos/debug',
'content/dist/rhel8/8.6/x86_64/baseos/os',
'content/dist/rhel8/8.6/x86_64/baseos/source/SRPMS',
'content/dist/rhel8/8.8/aarch64/appstream/debug',
'content/dist/rhel8/8.8/aarch64/appstream/os',
'content/dist/rhel8/8.8/aarch64/appstream/source/SRPMS',
'content/dist/rhel8/8.8/aarch64/baseos/debug',
'content/dist/rhel8/8.8/aarch64/baseos/os',
'content/dist/rhel8/8.8/aarch64/baseos/source/SRPMS',
'content/dist/rhel8/8.8/ppc64le/appstream/debug',
'content/dist/rhel8/8.8/ppc64le/appstream/os',
'content/dist/rhel8/8.8/ppc64le/appstream/source/SRPMS',
'content/dist/rhel8/8.8/ppc64le/baseos/debug',
'content/dist/rhel8/8.8/ppc64le/baseos/os',
'content/dist/rhel8/8.8/ppc64le/baseos/source/SRPMS',
'content/dist/rhel8/8.8/s390x/appstream/debug',
'content/dist/rhel8/8.8/s390x/appstream/os',
'content/dist/rhel8/8.8/s390x/appstream/source/SRPMS',
'content/dist/rhel8/8.8/s390x/baseos/debug',
'content/dist/rhel8/8.8/s390x/baseos/os',
'content/dist/rhel8/8.8/s390x/baseos/source/SRPMS',
'content/dist/rhel8/8.8/x86_64/appstream/debug',
'content/dist/rhel8/8.8/x86_64/appstream/os',
'content/dist/rhel8/8.8/x86_64/appstream/source/SRPMS',
'content/dist/rhel8/8.8/x86_64/baseos/debug',
'content/dist/rhel8/8.8/x86_64/baseos/os',
'content/dist/rhel8/8.8/x86_64/baseos/source/SRPMS',
'content/dist/rhel8/8.9/aarch64/appstream/debug',
'content/dist/rhel8/8.9/aarch64/appstream/os',
'content/dist/rhel8/8.9/aarch64/appstream/source/SRPMS',
'content/dist/rhel8/8.9/aarch64/baseos/debug',
'content/dist/rhel8/8.9/aarch64/baseos/os',
'content/dist/rhel8/8.9/aarch64/baseos/source/SRPMS',
'content/dist/rhel8/8.9/ppc64le/appstream/debug',
'content/dist/rhel8/8.9/ppc64le/appstream/os',
'content/dist/rhel8/8.9/ppc64le/appstream/source/SRPMS',
'content/dist/rhel8/8.9/ppc64le/baseos/debug',
'content/dist/rhel8/8.9/ppc64le/baseos/os',
'content/dist/rhel8/8.9/ppc64le/baseos/source/SRPMS',
'content/dist/rhel8/8.9/s390x/appstream/debug',
'content/dist/rhel8/8.9/s390x/appstream/os',
'content/dist/rhel8/8.9/s390x/appstream/source/SRPMS',
'content/dist/rhel8/8.9/s390x/baseos/debug',
'content/dist/rhel8/8.9/s390x/baseos/os',
'content/dist/rhel8/8.9/s390x/baseos/source/SRPMS',
'content/dist/rhel8/8.9/x86_64/appstream/debug',
'content/dist/rhel8/8.9/x86_64/appstream/os',
'content/dist/rhel8/8.9/x86_64/appstream/source/SRPMS',
'content/dist/rhel8/8.9/x86_64/baseos/debug',
'content/dist/rhel8/8.9/x86_64/baseos/os',
'content/dist/rhel8/8.9/x86_64/baseos/source/SRPMS',
'content/dist/rhel8/8/aarch64/appstream/debug',
'content/dist/rhel8/8/aarch64/appstream/os',
'content/dist/rhel8/8/aarch64/appstream/source/SRPMS',
'content/dist/rhel8/8/aarch64/baseos/debug',
'content/dist/rhel8/8/aarch64/baseos/os',
'content/dist/rhel8/8/aarch64/baseos/source/SRPMS',
'content/dist/rhel8/8/ppc64le/appstream/debug',
'content/dist/rhel8/8/ppc64le/appstream/os',
'content/dist/rhel8/8/ppc64le/appstream/source/SRPMS',
'content/dist/rhel8/8/ppc64le/baseos/debug',
'content/dist/rhel8/8/ppc64le/baseos/os',
'content/dist/rhel8/8/ppc64le/baseos/source/SRPMS',
'content/dist/rhel8/8/s390x/appstream/debug',
'content/dist/rhel8/8/s390x/appstream/os',
'content/dist/rhel8/8/s390x/appstream/source/SRPMS',
'content/dist/rhel8/8/s390x/baseos/debug',
'content/dist/rhel8/8/s390x/baseos/os',
'content/dist/rhel8/8/s390x/baseos/source/SRPMS',
'content/dist/rhel8/8/x86_64/appstream/debug',
'content/dist/rhel8/8/x86_64/appstream/os',
'content/dist/rhel8/8/x86_64/appstream/source/SRPMS',
'content/dist/rhel8/8/x86_64/baseos/debug',
'content/dist/rhel8/8/x86_64/baseos/os',
'content/dist/rhel8/8/x86_64/baseos/source/SRPMS'
],
'pkgs': [
{'reference':'libssh-0.9.4-2.el8', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libssh-config-0.9.4-2.el8', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libssh-devel-0.9.4-2.el8', 'release':'8', 'rpm_spec_vers_cmp':TRUE}
]
}
];
var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);
var flag = 0;
foreach var constraint_array ( constraints ) {
var repo_relative_urls = NULL;
if (!empty_or_null(constraint_array['repo_relative_urls'])) repo_relative_urls = constraint_array['repo_relative_urls'];
foreach var pkg ( constraint_array['pkgs'] ) {
var reference = NULL;
var _release = NULL;
var sp = NULL;
var _cpu = NULL;
var el_string = NULL;
var rpm_spec_vers_cmp = NULL;
var epoch = NULL;
var allowmaj = NULL;
var exists_check = NULL;
var cves = NULL;
if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
if (reference &&
_release &&
rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
(applicable_repo_urls || (!exists_check || rpm_exists(release:_release, rpm:exists_check))) &&
rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
}
}
if (flag)
{
var extra = NULL;
if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
else extra = rpm_report_get();
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : extra
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libssh / libssh-config / libssh-devel');
}
Vendor | Product | Version | CPE |
---|---|---|---|
redhat | enterprise_linux | libssh | p-cpe:/a:redhat:enterprise_linux:libssh |
redhat | enterprise_linux | libssh-devel | p-cpe:/a:redhat:enterprise_linux:libssh-devel |
redhat | enterprise_linux | 8 | cpe:/o:redhat:enterprise_linux:8 |
redhat | enterprise_linux | libssh-config | p-cpe:/a:redhat:enterprise_linux:libssh-config |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14889
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1730
www.nessus.org/u?159e9a3e
www.nessus.org/u?b7e37d18
access.redhat.com/errata/RHSA-2020:4545
access.redhat.com/security/updates/classification/#moderate
bugzilla.redhat.com/show_bug.cgi?id=1733914
bugzilla.redhat.com/show_bug.cgi?id=1772523
bugzilla.redhat.com/show_bug.cgi?id=1801998
bugzilla.redhat.com/show_bug.cgi?id=1804797
bugzilla.redhat.com/show_bug.cgi?id=1821339
bugzilla.redhat.com/show_bug.cgi?id=1849071
9.3 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:M/Au:N/C:C/I:C/A:C
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.5 High
AI Score
Confidence
Low
0.007 Low
EPSS
Percentile
80.7%