Fedora 12 : krb5-1.7.1-6.fc12 (2010-4677)

2010-07-01T00:00:00
ID FEDORA_2010-4677.NASL
Type nessus
Reporter Tenable
Modified 2015-10-20T00:00:00

Description

A GSSAPI-authenticated service could be remotely forced to trigger an assertion failure by sending it certain invalid messages (MITKRB5-SA-2010-002, CVE-2010-0628). The included patch for adding PAM support to the bundled FTP server contained a bug which would cause the service to crash if a client attempted to authenticate as a user who was not known to the server system. In the default xinetd configuration, the service would be invoked with the -a flag, and this would therefore only be possible if the client authenticated using GSSAPI beforehand.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory 2010-4677.
#

include("compat.inc");

if (description)
{
  script_id(47369);
  script_version("$Revision: 1.9 $");
  script_cvs_date("$Date: 2015/10/20 21:38:17 $");

  script_cve_id("CVE-2010-0628");
  script_bugtraq_id(38904);
  script_xref(name:"FEDORA", value:"2010-4677");

  script_name(english:"Fedora 12 : krb5-1.7.1-6.fc12 (2010-4677)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"A GSSAPI-authenticated service could be remotely forced to trigger an
assertion failure by sending it certain invalid messages
(MITKRB5-SA-2010-002, CVE-2010-0628). The included patch for adding
PAM support to the bundled FTP server contained a bug which would
cause the service to crash if a client attempted to authenticate as a
user who was not known to the server system. In the default xinetd
configuration, the service would be invoked with the -a flag, and this
would therefore only be possible if the client authenticated using
GSSAPI beforehand.

Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.redhat.com/show_bug.cgi?id=566258"
  );
  # https://lists.fedoraproject.org/pipermail/package-announce/2010-March/038129.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?29640e85"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected krb5 package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:ND/RL:OF/RC:C");
  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:fedoraproject:fedora:krb5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:12");

  script_set_attribute(attribute:"patch_publication_date", value:"2010/03/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2010/07/01");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2010-2015 Tenable Network Security, Inc.");
  script_family(english:"Fedora Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/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/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! ereg(pattern:"^12([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 12.x", "Fedora " + os_ver);

if (!get_kb_item("Host/RedHat/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, "Fedora", cpu);

flag = 0;
if (rpm_check(release:"FC12", reference:"krb5-1.7.1-6.fc12")) 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");
}