Flaw in MIT Kerberos allows remote attackers to bypass preauthentication flag and crash Kerberos proces
Reporter | Title | Published | Views | Family All 84 |
---|---|---|---|---|
![]() | lib32-krb5: multiple issues | 12 Jul 201500:00 | – | archlinux |
![]() | krb5: multiple issues | 12 Jul 201500:00 | – | archlinux |
![]() | RHEL 7 : krb5 (RHSA-2015:2154) | 19 Nov 201500:00 | – | nessus |
![]() | Oracle Linux 7 : krb5 (ELSA-2015-2154) | 24 Nov 201500:00 | – | nessus |
![]() | CentOS 7 : krb5 (CESA-2015:2154) | 2 Dec 201500:00 | – | nessus |
![]() | Scientific Linux Security Update : krb5 on SL7.x x86_64 (20151119) | 22 Dec 201500:00 | – | nessus |
![]() | SUSE SLES12 Security Update : krb5 (SUSE-SU-2015:1276-1) | 22 Jul 201500:00 | – | nessus |
![]() | Fedora 22 : krb5-1.13.1-3.fc22 (2015-7866) | 12 May 201500:00 | – | nessus |
![]() | FreeBSD : krb5 -- requires_preauth bypass in PKINIT-enabled KDC (406636fe-055d-11e5-aab1-d050996490d0) | 29 May 201500:00 | – | nessus |
![]() | Ubuntu 14.04 LTS : Kerberos vulnerabilities (USN-2810-1) | 13 Nov 201500:00 | – | nessus |
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2015-624.
#
include("compat.inc");
if (description)
{
script_id(87350);
script_version("2.4");
script_cvs_date("Date: 2018/04/18 15:09:35");
script_cve_id("CVE-2014-5355", "CVE-2015-2694");
script_xref(name:"ALAS", value:"2015-624");
script_name(english:"Amazon Linux AMI : krb5 (ALAS-2015-624)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Amazon Linux AMI host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"A flaw was found in the OTP kdcpreauth module of MIT Kerberos. A
remote attacker could use this flaw to bypass the requires_preauth
flag on a client principal and obtain a ciphertext encrypted in the
principal's long-term key. This ciphertext could be used to conduct an
off-line dictionary attack against the user's password.
It was found that the krb5_read_message() function of MIT Kerberos did
not correctly sanitize input, and could create invalid krb5_data
objects. A remote, unauthenticated attacker could use this flaw to
crash a Kerberos child process via a specially crafted request."
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2015-624.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update krb5' to update your system."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:krb5-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:krb5-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:krb5-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:krb5-pkinit-openssl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:krb5-server");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:krb5-server-ldap");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:krb5-workstation");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_set_attribute(attribute:"patch_publication_date", value:"2015/12/14");
script_set_attribute(attribute:"plugin_publication_date", value:"2015/12/15");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2015-2018 Tenable Network Security, Inc.");
script_family(english:"Amazon Linux Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/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/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "A")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (rpm_check(release:"ALA", reference:"krb5-debuginfo-1.13.2-10.39.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"krb5-devel-1.13.2-10.39.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"krb5-libs-1.13.2-10.39.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"krb5-pkinit-openssl-1.13.2-10.39.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"krb5-server-1.13.2-10.39.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"krb5-server-ldap-1.13.2-10.39.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"krb5-workstation-1.13.2-10.39.amzn1")) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
else security_warning(0);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "krb5-debuginfo / krb5-devel / krb5-libs / krb5-pkinit-openssl / etc");
}
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