AIX OpenSSH Advisory : openssh_advisory8.asc

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(90942);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/04/21");

  script_cve_id(
    "CVE-2016-1908",
    "CVE-2016-3115"
  );
  script_xref(name:"EDB-ID", value:"39569");

  script_name(english:"AIX OpenSSH Advisory : openssh_advisory8.asc");
  script_summary(english:"Checks the version of the OpenSSH packages and iFixes.");

  script_set_attribute(attribute:"synopsis", value:
"The remote AIX host has a version of OpenSSH installed that is
affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The remote AIX host has a version of OpenSSH installed that is
affected by the following vulnerabilities :

  - A remote code execution vulnerability exists in the
    sshd server component of OpenSSH due to improper
    sanitization of X11 authentication credentials. An
    authenticated, remote attacker can exploit this
    vulnerability to inject arbitrary xauth commands.
    (CVE-2016-3115)

  - A security bypass vulnerability exists in the sshd
    server component of OpenSSH due to improper error
    handling. An authenticated, remote attacker can exploit
    this vulnerability, when an authentication cookie is
    generated during untrusted X11 forwarding, to gain
    access to the X server on the host system.
    (CVE-2016-1908)");
  script_set_attribute(attribute:"see_also", value:"https://aix.software.ibm.com/aix/efixes/security/openssh_advisory8.asc");
  script_set_attribute(attribute:"solution", value:
"A fix is available and can be downloaded from the IBM AIX website.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:"vuln_publication_date", value:"2016/01/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/05/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/05/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:ibm:aix");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:openbsd:openssh");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"AIX Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2016-2023 Tenable Network Security, Inc.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/AIX/lslpp", "Host/local_checks_enabled", "Host/AIX/version");

  exit(0);
}

include("aix.inc");
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
oslevel = get_kb_item("Host/AIX/version");
if (isnull(oslevel)) audit(AUDIT_UNKNOWN_APP_VER, "AIX");
if ( oslevel != "AIX-5.3" && oslevel != "AIX-6.1" && oslevel != "AIX-7.1" && oslevel != "AIX-7.2" )
{
  oslevel = ereg_replace(string:oslevel, pattern:"-", replace:" ");
  audit(AUDIT_OS_NOT, "AIX 5.3 / 6.1 / 7.1 / 7.2", oslevel);
}

if ( ! get_kb_item("Host/AIX/lslpp") ) audit(AUDIT_PACKAGE_LIST_MISSING);

if ( get_kb_item("Host/AIX/emgr_failure" ) ) exit(0, "This AIX package check is disabled because : "+get_kb_item("Host/AIX/emgr_failure") );

flag = 0;

ifixes_6110 = "(IV84698m9b)";
ifixes_6201 = "(IV84698m9a)";


if (aix_check_ifix(release:"5.3", patch:ifixes_6110, package:"openssh.base.client", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++;
if (aix_check_ifix(release:"5.3", patch:ifixes_6201, package:"openssh.base.client", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++;
if (aix_check_ifix(release:"6.1", patch:ifixes_6110, package:"openssh.base.client", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++;
if (aix_check_ifix(release:"6.1", patch:ifixes_6201, package:"openssh.base.client", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++;
if (aix_check_ifix(release:"7.1", patch:ifixes_6110, package:"openssh.base.client", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++;
if (aix_check_ifix(release:"7.1", patch:ifixes_6201, package:"openssh.base.client", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++;
if (aix_check_ifix(release:"7.2", patch:ifixes_6110, package:"openssh.base.client", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++;
if (aix_check_ifix(release:"7.2", patch:ifixes_6201, package:"openssh.base.client", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++;

if (aix_check_ifix(release:"5.3", patch:ifixes_6110, package:"openssh.base.server", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++;
if (aix_check_ifix(release:"5.3", patch:ifixes_6201, package:"openssh.base.server", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++;
if (aix_check_ifix(release:"6.1", patch:ifixes_6110, package:"openssh.base.server", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++;
if (aix_check_ifix(release:"6.1", patch:ifixes_6201, package:"openssh.base.server", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++;
if (aix_check_ifix(release:"7.1", patch:ifixes_6110, package:"openssh.base.server", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++;
if (aix_check_ifix(release:"7.1", patch:ifixes_6201, package:"openssh.base.server", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++;
if (aix_check_ifix(release:"7.2", patch:ifixes_6110, package:"openssh.base.server", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6110") < 0) flag++;
if (aix_check_ifix(release:"7.2", patch:ifixes_6201, package:"openssh.base.server", minfilesetver:"6.0.0.6200", maxfilesetver:"6.0.0.6201") < 0) flag++;

if (flag)
{
  aix_report_extra = ereg_replace(string:aix_report_get(), pattern:"[()]", replace:"");
  aix_report_extra = ereg_replace(string:aix_report_extra, pattern:"[|]", replace:" or ");
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : aix_report_extra
  );
}
else
{
  tested = aix_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "openssh.base.client / openssh.base.server");
}