CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
EPSS
Percentile
94.3%
The version of OpenSSH running on the remote host is affected by a denial of service vulnerability. The default configuration of OpenSSH through 6.1 enforces a fixed time limit between establishing a TCP connection and completing a login, which makes it easier for remote attackers to cause a denial of service (connection-slot exhaustion) by periodically making many new TCP connections.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The text in the description was extracted from AIX Security
# Advisory openssh_advisory2.asc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(73558);
script_version("1.7");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/04/21");
script_cve_id("CVE-2010-5107");
script_bugtraq_id(58162);
script_name(english:"AIX OpenSSH Advisory : openssh_advisory2.asc");
script_summary(english:"Checks the version of the openssh client and server packages");
script_set_attribute(attribute:"synopsis", value:"The remote AIX host is running a vulnerable version of OpenSSH.");
script_set_attribute(attribute:"description", value:
"The version of OpenSSH running on the remote host is affected by a
denial of service vulnerability. The default configuration of OpenSSH
through 6.1 enforces a fixed time limit between establishing a TCP
connection and completing a login, which makes it easier for remote
attackers to cause a denial of service (connection-slot exhaustion)
by periodically making many new TCP connections.");
script_set_attribute(attribute:"see_also", value:"https://aix.software.ibm.com/aix/efixes/security/openssh_advisory2.asc");
script_set_attribute(attribute:"see_also", value:"https://www14.software.ibm.com/webapp/iwm/web/preLogin.do?source=aixbp");
script_set_attribute(attribute:"solution", value:
"A fix is available, and it can be downloaded from the AIX website.
To extract the fixes from the tar file:
zcat OpenSSH_6.0.0.6102.tar.Z | tar xvf -
IMPORTANT: If possible, it is recommended that a mksysb backup of
the system be created. Verify it is both bootable and readable
before proceeding.
To preview the fix installation:
installp -apYd . OpenSSH_6.0.0.6102
To install the fix package:
installp -aXYd . OpenSSH_6.0.0.6102");
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:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:ibm:aix");
script_set_attribute(attribute:"vuln_publication_date", value:"2013/02/06");
script_set_attribute(attribute:"patch_publication_date", value:"2013/04/08");
script_set_attribute(attribute:"plugin_publication_date", value:"2014/04/16");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2014-2023 Tenable Network Security, Inc.");
script_family(english:"AIX Local Security Checks");
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_or_exit("Host/AIX/version");
if ( oslevel != "AIX-5.3" && oslevel != "AIX-6.1" && oslevel != "AIX-7.1" )
{
oslevel = ereg_replace(string:oslevel, pattern:"-", replace:" ");
audit(AUDIT_OS_NOT, "AIX 5.3 / 6.1 / 7.1", oslevel);
}
if ( ! get_kb_item("Host/AIX/lslpp") ) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (aix_check_package(release:"5.3", package:"openssh.base.client", minpackagever:"0.0.0.0", maxpackagever:"6.0.0.6101", fixpackagever:"6.0.0.6102") > 0) flag++;
if (aix_check_package(release:"6.1", package:"openssh.base.client", minpackagever:"0.0.0.0", maxpackagever:"6.0.0.6101", fixpackagever:"6.0.0.6102") > 0) flag++;
if (aix_check_package(release:"7.1", package:"openssh.base.client", minpackagever:"0.0.0.0", maxpackagever:"6.0.0.6101", fixpackagever:"6.0.0.6102") > 0) flag++;
if (aix_check_package(release:"5.3", package:"openssh.base.server", minpackagever:"0.0.0.0", maxpackagever:"6.0.0.6101", fixpackagever:"6.0.0.6102") > 0) flag++;
if (aix_check_package(release:"6.1", package:"openssh.base.server", minpackagever:"0.0.0.0", maxpackagever:"6.0.0.6101", fixpackagever:"6.0.0.6102") > 0) flag++;
if (aix_check_package(release:"7.1", package:"openssh.base.server", minpackagever:"0.0.0.0", maxpackagever:"6.0.0.6101", fixpackagever:"6.0.0.6102") > 0) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : aix_report_get()
);
}
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");
}