4.6 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
6.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
0.0004 Low
EPSS
Percentile
14.4%
tpm2-tss 2.4.3 changed or fixed :
• Fix CVE-2020-24455 FAPI PolicyPCR not instatiating correctly • Note that all TPM object created with a PolicyPCR with the currentPcrs • and currentPcrsAndBank options have been created with an incorrect policy • that ommits PCR checks. All these objects have to be recreated! • Fix bug in FAPI NV creation with custom index values • Cleanup of leftover sessions in error cases in FAPI • Better error messages in several FAPI errors • Add checks to FAPI policy paths • Add checks if FAPI is correctly provisioned • Fix execution of FAPI policies in some cases •
Allow 0x prefixes for TPMU_HA in JSON encoding
Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Fedora Security Advisory FEDORA-2020-bb8e3c5548.
#
include("compat.inc");
if (description)
{
script_id(141248);
script_version("1.3");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/03/05");
script_cve_id("CVE-2020-24455");
script_xref(name:"FEDORA", value:"2020-bb8e3c5548");
script_name(english:"Fedora 32 : tpm2-tss (2020-bb8e3c5548)");
script_summary(english:"Checks rpm output for the updated package.");
script_set_attribute(
attribute:"synopsis",
value:"The remote Fedora host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"tpm2-tss 2.4.3 changed or fixed :
• Fix CVE-2020-24455 FAPI PolicyPCR not instatiating correctly
• Note that all TPM object created with a PolicyPCR with the
currentPcrs • and currentPcrsAndBank options have been created
with an incorrect policy • that ommits PCR checks. All these
objects have to be recreated! • Fix bug in FAPI NV creation with
custom index values • Cleanup of leftover sessions in error cases
in FAPI • Better error messages in several FAPI errors • Add
checks to FAPI policy paths • Add checks if FAPI is correctly
provisioned • Fix execution of FAPI policies in some cases •
Allow 0x prefixes for TPMU_HA in JSON encoding
Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as
possible without introducing additional issues."
);
script_set_attribute(
attribute:"see_also",
value:"https://bodhi.fedoraproject.org/updates/FEDORA-2020-bb8e3c5548"
);
script_set_attribute(
attribute:"solution",
value:"Update the affected tpm2-tss package."
);
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/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:L/PR:H/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-2020-24455");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:tpm2-tss");
script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:32");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/02/26");
script_set_attribute(attribute:"patch_publication_date", value:"2020/10/06");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/10/07");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2020-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Fedora Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/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/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! preg(pattern:"^32([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 32", "Fedora " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);
flag = 0;
if (rpm_check(release:"FC32", reference:"tpm2-tss-2.4.3-1.fc32")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : rpm_report_get()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "tpm2-tss");
}
Vendor | Product | Version | CPE |
---|---|---|---|
fedoraproject | fedora | tpm2-tss | p-cpe:/a:fedoraproject:fedora:tpm2-tss |
fedoraproject | fedora | 32 | cpe:/o:fedoraproject:fedora:32 |
4.6 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
6.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
0.0004 Low
EPSS
Percentile
14.4%