CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
87.9%
Updated openssh packages that fix two security issues are now available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.
OpenSSH is OpenBSD’s SSH (Secure Shell) protocol implementation. These packages include the core files necessary for both the OpenSSH client and server.
It was discovered that the OpenSSH server did not sanitize data received in requests to enable X11 forwarding. An authenticated client with restricted SSH access could possibly use this flaw to bypass intended restrictions. (CVE-2016-3115)
An access flaw was discovered in OpenSSH; the OpenSSH client did not correctly handle failures to generate authentication cookies for untrusted X11 forwarding. A malicious or compromised remote X application could possibly use this flaw to establish a trusted connection to the local X server, even if only untrusted X11 forwarding was requested. (CVE-2016-1908)
All openssh users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, the OpenSSH server daemon (sshd) will be restarted automatically.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2016:0465 and
# CentOS Errata and Security Advisory 2016:0465 respectively.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(90068);
script_version("2.14");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");
script_cve_id("CVE-2016-1908", "CVE-2016-3115");
script_xref(name:"RHSA", value:"2016:0465");
script_name(english:"CentOS 7 : openssh (CESA-2016:0465)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote CentOS host is missing one or more security updates."
);
script_set_attribute(
attribute:"description",
value:
"Updated openssh packages that fix two security issues are now
available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having Moderate
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.
OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. These
packages include the core files necessary for both the OpenSSH client
and server.
It was discovered that the OpenSSH server did not sanitize data
received in requests to enable X11 forwarding. An authenticated client
with restricted SSH access could possibly use this flaw to bypass
intended restrictions. (CVE-2016-3115)
An access flaw was discovered in OpenSSH; the OpenSSH client did not
correctly handle failures to generate authentication cookies for
untrusted X11 forwarding. A malicious or compromised remote X
application could possibly use this flaw to establish a trusted
connection to the local X server, even if only untrusted X11
forwarding was requested. (CVE-2016-1908)
All openssh users are advised to upgrade to these updated packages,
which contain backported patches to correct these issues. After
installing this update, the OpenSSH server daemon (sshd) will be
restarted automatically."
);
# https://lists.centos.org/pipermail/centos-announce/2016-March/021746.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?111fbd4d"
);
script_set_attribute(
attribute:"solution",
value:"Update the affected openssh packages."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/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:N/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-2016-1908");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:openssh");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:openssh-askpass");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:openssh-clients");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:openssh-keycat");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:openssh-ldap");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:openssh-server");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:openssh-server-sysvinit");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:pam_ssh_agent_auth");
script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
script_set_attribute(attribute:"vuln_publication_date", value:"2016/03/22");
script_set_attribute(attribute:"patch_publication_date", value:"2016/03/21");
script_set_attribute(attribute:"plugin_publication_date", value:"2016/03/22");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2016-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"CentOS Local Security Checks");
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:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 7.x", "CentOS " + os_ver);
if (!get_kb_item("Host/CentOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);
flag = 0;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"openssh-6.6.1p1-25.el7_2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"openssh-askpass-6.6.1p1-25.el7_2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"openssh-clients-6.6.1p1-25.el7_2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"openssh-keycat-6.6.1p1-25.el7_2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"openssh-ldap-6.6.1p1-25.el7_2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"openssh-server-6.6.1p1-25.el7_2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"openssh-server-sysvinit-6.6.1p1-25.el7_2")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"pam_ssh_agent_auth-0.9.3-9.25.el7_2")) 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, "openssh / openssh-askpass / openssh-clients / openssh-keycat / etc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
centos | centos | openssh | p-cpe:/a:centos:centos:openssh |
centos | centos | openssh-askpass | p-cpe:/a:centos:centos:openssh-askpass |
centos | centos | openssh-clients | p-cpe:/a:centos:centos:openssh-clients |
centos | centos | openssh-keycat | p-cpe:/a:centos:centos:openssh-keycat |
centos | centos | openssh-ldap | p-cpe:/a:centos:centos:openssh-ldap |
centos | centos | openssh-server | p-cpe:/a:centos:centos:openssh-server |
centos | centos | openssh-server-sysvinit | p-cpe:/a:centos:centos:openssh-server-sysvinit |
centos | centos | pam_ssh_agent_auth | p-cpe:/a:centos:centos:pam_ssh_agent_auth |
centos | centos | 7 | cpe:/o:centos:centos:7 |
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
87.9%