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nessusThis script is Copyright (C) 2016-2023 Tenable Network Security, Inc.AIX_OPENSSH_ADVISORY9.NASL
HistoryDec 02, 2016 - 12:00 a.m.

AIX OpenSSH Advisory : openssh_advisory9.asc

2016-12-0200:00:00
This script is Copyright (C) 2016-2023 Tenable Network Security, Inc.
www.tenable.com
57

The remote AIX host has a version of OpenSSH installed that is affected by the following vulnerabilities :

  • An elevation of privilege vulnerability exists in the do_setup_env() function within file session.c when handling user-supplied environmental variables. A local attacker can exploit this to gain elevated privileges by triggering a crafted environment for the /bin/login program. This vulnerability requires that the UseLogin feature is enabled and that PAM is configured to read .pam_environment files in user home directories.
    (CVE-2015-8325)

  • A flaw exists when handling authentication requests that involve overly long passwords due to returning shorter response times for requests for invalid users than for valid users. An unauthenticated, remote attacker can exploit this to enumerate valid usernames by conducting a timing attack. (CVE-2016-6210)

  • A denial of service vulnerability exists in the auth_password() function within auth-passwd.c due to a a failure to limit password lengths. An unauthenticated, remote attacker can exploit this, via overly long passwords, to cause the excessive consumption of CPU resources. (CVE-2016-6515)

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

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

if (description)
{
  script_id(95477);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/04/21");

  script_cve_id(
    "CVE-2015-8325",
    "CVE-2016-6210",
    "CVE-2016-6515"
  );
  script_bugtraq_id(
    86187,
    91812,
    92212
  );
  script_xref(name:"EDB-ID", value:"40113");
  script_xref(name:"EDB-ID", value:"40136");

  script_name(english:"AIX OpenSSH Advisory : openssh_advisory9.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 elevation of privilege vulnerability exists in the
    do_setup_env() function within file session.c when
    handling user-supplied environmental variables. A local
    attacker can exploit this to gain elevated privileges by
    triggering a crafted environment for the /bin/login
    program. This vulnerability requires that the UseLogin
    feature is enabled and that PAM is configured to read
    .pam_environment files in user home directories.
    (CVE-2015-8325)

  - A flaw exists when handling authentication requests that
    involve overly long passwords due to returning shorter
    response times for requests for invalid users than for
    valid users. An unauthenticated, remote attacker can
    exploit this to enumerate valid usernames by conducting
    a timing attack. (CVE-2016-6210)

  - A denial of service vulnerability exists in the
    auth_password() function within auth-passwd.c due to a
    a failure to limit password lengths. An unauthenticated,
    remote attacker can exploit this, via overly long
    passwords, to cause the excessive consumption of CPU
    resources. (CVE-2016-6515)");
  script_set_attribute(attribute:"see_also", value:"https://aix.software.ibm.com/aix/efixes/security/openssh_advisory9.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:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/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:"2016/04/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/09/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/12/02");

  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_6202 = "(6202_ifix)";


if (aix_check_ifix(release:"5.3", patch:ifixes_6202, package:"openssh.base.client", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6202") < 0) flag++;
if (aix_check_ifix(release:"6.1", patch:ifixes_6202, package:"openssh.base.client", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6202") < 0) flag++;
if (aix_check_ifix(release:"7.1", patch:ifixes_6202, package:"openssh.base.client", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6202") < 0) flag++;
if (aix_check_ifix(release:"7.2", patch:ifixes_6202, package:"openssh.base.client", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6202") < 0) flag++;

if (aix_check_ifix(release:"5.3", patch:ifixes_6202, package:"openssh.base.server", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6202") < 0) flag++;
if (aix_check_ifix(release:"6.1", patch:ifixes_6202, package:"openssh.base.server", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6202") < 0) flag++;
if (aix_check_ifix(release:"7.1", patch:ifixes_6202, package:"openssh.base.server", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6202") < 0) flag++;
if (aix_check_ifix(release:"7.2", patch:ifixes_6202, package:"openssh.base.server", minfilesetver:"4.0.0.5200", maxfilesetver:"6.0.0.6202") < 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_HOLE,
    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");
}
VendorProductVersion
ibmaix
openbsdopenssh
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