AIX OpenSSH Advisory : openssh_advisory7.asc

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

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

if (description)
{
  script_id(88590);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/04/21");

  script_cve_id(
    "CVE-2016-0777",
    "CVE-2016-0778"
  );
  script_bugtraq_id(
    80695,
    80698
  );
  script_xref(name:"CERT", value:"456088");
  script_xref(name:"EDB-ID", value:"39247");

  script_name(english:"AIX OpenSSH Advisory : openssh_advisory7.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 :

  - An information disclosure vulnerability exists in the
    resend_bytes() function in the undocumented roaming
    connection feature. An authenticated, remote attacker
    can exploit this vulnerability, by persuading a victim
    to connect to a malicious server, to retrieve private
    cryptographic keys or other sensitive information.
    (CVE-2016-0777)

  - A heap-based buffer overflow condition exists in the
    undocumented roaming connection feature due to improper
    bounds checking of user-supplied input to the
    packet_write_wait() and ssh_packet_write_wait()
    functions whenever the non-default option ProxyCommand
    is used with either ForwardAgent or ForwardX11. An
    authenticated, remote attacker can exploit this
    vulnerability, by persuading a victim to connect to a
    malicious server, to execute arbitrary code or cause
    a denial of service. (CVE-2016-0778)");
  script_set_attribute(attribute:"see_also", value:"https://aix.software.ibm.com/aix/efixes/security/openssh_advisory7.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:P");
  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:"2016/01/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/02/05");

  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 = "(IV80743m9b|IV84698m9b)";
ifixes_6201 = "(IV80743m9a|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");
}