CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
27.7%
The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2021-9575 advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Oracle Linux Security Advisory ELSA-2021-9575.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(155926);
script_version("1.3");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/02/09");
script_cve_id("CVE-2021-41617");
script_xref(name:"IAVA", value:"2021-A-0474-S");
script_name(english:"Oracle Linux 7 : openssh (ELSA-2021-9575)");
script_set_attribute(attribute:"synopsis", value:
"The remote Oracle Linux host is missing a security update.");
script_set_attribute(attribute:"description", value:
"The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the
ELSA-2021-9575 advisory.
- sshd in OpenSSH 6.2 through 8.x before 8.8, when certain non-default configurations are used, allows
privilege escalation because supplemental groups are not initialized as expected. Helper programs for
AuthorizedKeysCommand and AuthorizedPrincipalsCommand may run with privileges associated with group
memberships of the sshd process, if the configuration specifies running the command as a different user.
(CVE-2021-41617)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://linux.oracle.com/errata/ELSA-2021-9575.html");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/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-2021-41617");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/09/26");
script_set_attribute(attribute:"patch_publication_date", value:"2021/12/07");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/12/08");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:openssh");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:openssh-askpass");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:openssh-cavs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:openssh-clients");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:openssh-keycat");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:openssh-ldap");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:openssh-server");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:openssh-server-sysvinit");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:pam_ssh_agent_auth");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Oracle Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/OracleLinux", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/local_checks_enabled");
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);
if (!get_kb_item('Host/OracleLinux')) audit(AUDIT_OS_NOT, 'Oracle Linux');
var release = get_kb_item("Host/RedHat/release");
if (isnull(release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:release)) audit(AUDIT_OS_NOT, 'Oracle Linux');
var os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Oracle Linux');
var os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'Oracle Linux 7', 'Oracle Linux ' + os_ver);
if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Oracle Linux', cpu);
var pkgs = [
{'reference':'openssh-7.4p1-22.0.1.el7_9_fips', 'cpu':'x86_64', 'release':'7', 'el_string':'el7_9_fips', 'rpm_spec_vers_cmp':TRUE, 'epoch':'10'},
{'reference':'openssh-askpass-7.4p1-22.0.1.el7_9_fips', 'cpu':'x86_64', 'release':'7', 'el_string':'el7_9_fips', 'rpm_spec_vers_cmp':TRUE, 'epoch':'10'},
{'reference':'openssh-cavs-7.4p1-22.0.1.el7_9_fips', 'cpu':'x86_64', 'release':'7', 'el_string':'el7_9_fips', 'rpm_spec_vers_cmp':TRUE, 'epoch':'10'},
{'reference':'openssh-clients-7.4p1-22.0.1.el7_9_fips', 'cpu':'x86_64', 'release':'7', 'el_string':'el7_9_fips', 'rpm_spec_vers_cmp':TRUE, 'epoch':'10'},
{'reference':'openssh-keycat-7.4p1-22.0.1.el7_9_fips', 'cpu':'x86_64', 'release':'7', 'el_string':'el7_9_fips', 'rpm_spec_vers_cmp':TRUE, 'epoch':'10'},
{'reference':'openssh-ldap-7.4p1-22.0.1.el7_9_fips', 'cpu':'x86_64', 'release':'7', 'el_string':'el7_9_fips', 'rpm_spec_vers_cmp':TRUE, 'epoch':'10'},
{'reference':'openssh-server-7.4p1-22.0.1.el7_9_fips', 'cpu':'x86_64', 'release':'7', 'el_string':'el7_9_fips', 'rpm_spec_vers_cmp':TRUE, 'epoch':'10'},
{'reference':'openssh-server-sysvinit-7.4p1-22.0.1.el7_9_fips', 'cpu':'x86_64', 'release':'7', 'el_string':'el7_9_fips', 'rpm_spec_vers_cmp':TRUE, 'epoch':'10'},
{'reference':'pam_ssh_agent_auth-0.10.3-2.22.0.1.el7_9_fips', 'cpu':'i686', 'release':'7', 'el_string':'el7_9_fips', 'rpm_spec_vers_cmp':TRUE, 'epoch':'10'},
{'reference':'pam_ssh_agent_auth-0.10.3-2.22.0.1.el7_9_fips', 'cpu':'x86_64', 'release':'7', 'el_string':'el7_9_fips', 'rpm_spec_vers_cmp':TRUE, 'epoch':'10'}
];
var flag = 0;
foreach var package_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;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) release = 'EL' + package_array['release'];
if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
if (reference && release) {
if (exists_check) {
if (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)) flag++;
} else {
if (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)) flag++;
}
}
}
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : rpm_report_get()
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'openssh / openssh-askpass / openssh-cavs / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
oracle | linux | 7 | cpe:/o:oracle:linux:7 |
oracle | linux | openssh | p-cpe:/a:oracle:linux:openssh |
oracle | linux | openssh-askpass | p-cpe:/a:oracle:linux:openssh-askpass |
oracle | linux | openssh-cavs | p-cpe:/a:oracle:linux:openssh-cavs |
oracle | linux | openssh-clients | p-cpe:/a:oracle:linux:openssh-clients |
oracle | linux | openssh-keycat | p-cpe:/a:oracle:linux:openssh-keycat |
oracle | linux | openssh-ldap | p-cpe:/a:oracle:linux:openssh-ldap |
oracle | linux | openssh-server | p-cpe:/a:oracle:linux:openssh-server |
oracle | linux | openssh-server-sysvinit | p-cpe:/a:oracle:linux:openssh-server-sysvinit |
oracle | linux | pam_ssh_agent_auth | p-cpe:/a:oracle:linux:pam_ssh_agent_auth |
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
27.7%