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
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
AI Score
Confidence
High
EPSS
Percentile
82.4%
An update for libssh2 is now available for Red Hat Enterprise Linux 6.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
The libssh2 packages provide a library that implements the SSH2 protocol.
Security Fix(es) :
libssh2: Integer overflow in transport read resulting in out of bounds write (CVE-2019-3855)
libssh2: Integer overflow in keyboard interactive handling resulting in out of bounds write (CVE-2019-3856)
libssh2: Integer overflow in SSH packet processing channel resulting in out of bounds write (CVE-2019-3857)
libssh2: Integer overflow in user authenticate keyboard interactive allows out-of-bounds writes (CVE-2019-3863)
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.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2019:1652 and
# CentOS Errata and Security Advisory 2019:1652 respectively.
#
include('compat.inc');
if (description)
{
script_id(126480);
script_version("1.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/10");
script_cve_id(
"CVE-2019-3855",
"CVE-2019-3856",
"CVE-2019-3857",
"CVE-2019-3863"
);
script_xref(name:"RHSA", value:"2019:1652");
script_name(english:"CentOS 6 : libssh2 (CESA-2019:1652)");
script_set_attribute(attribute:"synopsis", value:
"The remote CentOS host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"An update for libssh2 is now available for Red Hat Enterprise Linux 6.
Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.
The libssh2 packages provide a library that implements the SSH2
protocol.
Security Fix(es) :
* libssh2: Integer overflow in transport read resulting in out of
bounds write (CVE-2019-3855)
* libssh2: Integer overflow in keyboard interactive handling resulting
in out of bounds write (CVE-2019-3856)
* libssh2: Integer overflow in SSH packet processing channel resulting
in out of bounds write (CVE-2019-3857)
* libssh2: Integer overflow in user authenticate keyboard interactive
allows out-of-bounds writes (CVE-2019-3863)
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.");
# https://lists.centos.org/pipermail/centos-announce/2019-July/023349.html
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?26c9a39a");
script_set_attribute(attribute:"solution", value:
"Update the affected libssh2 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-2019-3855");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2019-3863");
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:"2019/03/21");
script_set_attribute(attribute:"patch_publication_date", value:"2019/07/03");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/07/05");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libssh2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libssh2-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libssh2-docs");
script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"CentOS Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2019-2024 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");
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:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 6.x", "CentOS " + os_ver);
if (!get_kb_item("Host/CentOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);
flag = 0;
if (rpm_check(release:"CentOS-6", reference:"libssh2-1.4.2-3.el6_10.1")) flag++;
if (rpm_check(release:"CentOS-6", reference:"libssh2-devel-1.4.2-3.el6_10.1")) flag++;
if (rpm_check(release:"CentOS-6", reference:"libssh2-docs-1.4.2-3.el6_10.1")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
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, "libssh2 / libssh2-devel / libssh2-docs");
}
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
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
AI Score
Confidence
High
EPSS
Percentile
82.4%