CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
EPSS
Percentile
13.2%
Updated krb5 packages are now available for Red Hat Enterprise Linux 4 to correct a privilege escalation security flaw.
This update has been rated as having important security impact by the Red Hat Security Response Team.
Kerberos is a network authentication system which allows clients and servers to authenticate to each other through use of symmetric encryption and a trusted third party, the KDC.
A flaw was found where some bundled Kerberos-aware applications would fail to check the result of the setuid() call. On Linux 2.6 kernels, the setuid() call can fail if certain user limits are hit. A local attacker could manipulate their environment in such a way to get the applications to continue to run as root, potentially leading to an escalation of privileges. (CVE-2006-3083).
Users are advised to update to these erratum packages which contain a backported fix to correct this issue.
#%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-2006:0612 and
# CentOS Errata and Security Advisory 2006:0612 respectively.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(22197);
script_version("1.17");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");
script_cve_id("CVE-2006-3083");
script_bugtraq_id(19427);
script_xref(name:"RHSA", value:"2006:0612");
script_name(english:"CentOS 4 : krb5 (CESA-2006:0612)");
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 krb5 packages are now available for Red Hat Enterprise Linux 4
to correct a privilege escalation security flaw.
This update has been rated as having important security impact by the
Red Hat Security Response Team.
Kerberos is a network authentication system which allows clients and
servers to authenticate to each other through use of symmetric
encryption and a trusted third party, the KDC.
A flaw was found where some bundled Kerberos-aware applications would
fail to check the result of the setuid() call. On Linux 2.6 kernels,
the setuid() call can fail if certain user limits are hit. A local
attacker could manipulate their environment in such a way to get the
applications to continue to run as root, potentially leading to an
escalation of privileges. (CVE-2006-3083).
Users are advised to update to these erratum packages which contain a
backported fix to correct this issue."
);
# https://lists.centos.org/pipermail/centos-announce/2006-August/013129.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?cbbc024b"
);
# https://lists.centos.org/pipermail/centos-announce/2006-August/013133.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?a54c66af"
);
# https://lists.centos.org/pipermail/centos-announce/2006-August/013134.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?b7181ffd"
);
script_set_attribute(attribute:"solution", value:"Update the affected krb5 packages.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-server");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:krb5-workstation");
script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:4");
script_set_attribute(attribute:"vuln_publication_date", value:"2006/08/09");
script_set_attribute(attribute:"patch_publication_date", value:"2006/08/10");
script_set_attribute(attribute:"plugin_publication_date", value:"2006/08/10");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2006-2021 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:"^4([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 4.x", "CentOS " + os_ver);
if (!get_kb_item("Host/CentOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && "ia64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);
flag = 0;
if (rpm_check(release:"CentOS-4", reference:"krb5-devel-1.3.4-33")) flag++;
if (rpm_check(release:"CentOS-4", reference:"krb5-libs-1.3.4-33")) flag++;
if (rpm_check(release:"CentOS-4", reference:"krb5-server-1.3.4-33")) flag++;
if (rpm_check(release:"CentOS-4", reference:"krb5-workstation-1.3.4-33")) 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, "krb5-devel / krb5-libs / krb5-server / krb5-workstation");
}