6.5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
7.2 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.5 High
AI Score
Confidence
High
0.006 Low
EPSS
Percentile
79.3%
The remote CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2020:3875 advisory.
tigervnc: Stack use-after-return due to incorrect usage of stack memory in ZRLEDecoder (CVE-2019-15691)
tigervnc: Heap buffer overflow triggered from CopyRectDecoder due to incorrect value checks (CVE-2019-15692)
tigervnc: Heap buffer overflow in TightDecoder::FilterGradient (CVE-2019-15693)
tigervnc: Heap buffer overflow in DecodeManager::decodeRect (CVE-2019-15694)
tigervnc: Stack buffer overflow in CMsgReader::readSetCursor (CVE-2019-15695)
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2020:3875 and
# CentOS Errata and Security Advisory 2020:3875 respectively.
##
include('compat.inc');
if (description)
{
script_id(141600);
script_version("1.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/15");
script_cve_id(
"CVE-2019-15691",
"CVE-2019-15692",
"CVE-2019-15693",
"CVE-2019-15694",
"CVE-2019-15695"
);
script_xref(name:"RHSA", value:"2020:3875");
script_name(english:"CentOS 7 : tigervnc (CESA-2020:3875)");
script_set_attribute(attribute:"synopsis", value:
"The remote CentOS Linux host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the
CESA-2020:3875 advisory.
- tigervnc: Stack use-after-return due to incorrect usage of stack memory in ZRLEDecoder (CVE-2019-15691)
- tigervnc: Heap buffer overflow triggered from CopyRectDecoder due to incorrect value checks
(CVE-2019-15692)
- tigervnc: Heap buffer overflow in TightDecoder::FilterGradient (CVE-2019-15693)
- tigervnc: Heap buffer overflow in DecodeManager::decodeRect (CVE-2019-15694)
- tigervnc: Stack buffer overflow in CMsgReader::readSetCursor (CVE-2019-15695)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
# https://lists.centos.org/pipermail/centos-cr-announce/2020-October/012852.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6ee8c61a");
script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/121.html");
script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/122.html");
script_set_attribute(attribute:"see_also", value:"https://cwe.mitre.org/data/definitions/672.html");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/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:H/UI:N/S:U/C:H/I:H/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-2019-15695");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_cwe_id(121, 122, 672);
script_set_attribute(attribute:"vuln_publication_date", value:"2019/12/26");
script_set_attribute(attribute:"patch_publication_date", value:"2020/10/20");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/10/20");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tigervnc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tigervnc-icons");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tigervnc-license");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tigervnc-server");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tigervnc-server-applet");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tigervnc-server-minimal");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:tigervnc-server-module");
script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"CentOS 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");
script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list", "Host/cpu");
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/CentOS/release');
if (isnull(release) || 'CentOS' >!< release) audit(AUDIT_OS_NOT, 'CentOS');
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'CentOS');
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'CentOS 7.x', 'CentOS ' + os_ver);
if (!get_kb_item('Host/CentOS/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'CentOS', cpu);
pkgs = [
{'reference':'tigervnc-1.8.0-21.el7', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'tigervnc-icons-1.8.0-21.el7', 'release':'CentOS-7'},
{'reference':'tigervnc-license-1.8.0-21.el7', 'release':'CentOS-7'},
{'reference':'tigervnc-server-1.8.0-21.el7', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'tigervnc-server-applet-1.8.0-21.el7', 'release':'CentOS-7'},
{'reference':'tigervnc-server-minimal-1.8.0-21.el7', 'cpu':'x86_64', 'release':'CentOS-7'},
{'reference':'tigervnc-server-module-1.8.0-21.el7', 'cpu':'x86_64', 'release':'CentOS-7'}
];
flag = 0;
foreach package_array ( pkgs ) {
reference = NULL;
release = NULL;
sp = NULL;
cpu = NULL;
el_string = NULL;
rpm_spec_vers_cmp = NULL;
epoch = NULL;
allowmaj = NULL;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) release = 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 (reference && release) {
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)
{
cr_plugin_caveat = '\n' +
'NOTE: The security advisory associated with this vulnerability has a\n' +
'fixed package version that may only be available in the continuous\n' +
'release (CR) repository for CentOS, until it is present in the next\n' +
'point release of CentOS.\n\n' +
'If an equal or higher package level does not exist in the baseline\n' +
'repository for your major version of CentOS, then updates from the CR\n' +
'repository will need to be applied in order to address the\n' +
'vulnerability.\n';
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : rpm_report_get() + cr_plugin_caveat
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'tigervnc / tigervnc-icons / tigervnc-license / etc');
}
Vendor | Product | Version | CPE |
---|---|---|---|
centos | centos | tigervnc | p-cpe:/a:centos:centos:tigervnc |
centos | centos | tigervnc-icons | p-cpe:/a:centos:centos:tigervnc-icons |
centos | centos | tigervnc-license | p-cpe:/a:centos:centos:tigervnc-license |
centos | centos | tigervnc-server | p-cpe:/a:centos:centos:tigervnc-server |
centos | centos | tigervnc-server-applet | p-cpe:/a:centos:centos:tigervnc-server-applet |
centos | centos | tigervnc-server-minimal | p-cpe:/a:centos:centos:tigervnc-server-minimal |
centos | centos | tigervnc-server-module | p-cpe:/a:centos:centos:tigervnc-server-module |
centos | centos | 7 | cpe:/o:centos:centos:7 |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15691
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15692
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15693
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15694
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15695
www.nessus.org/u?6ee8c61a
cwe.mitre.org/data/definitions/121.html
cwe.mitre.org/data/definitions/122.html
cwe.mitre.org/data/definitions/672.html
6.5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
7.2 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.5 High
AI Score
Confidence
High
0.006 Low
EPSS
Percentile
79.3%