CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
97.7%
An input validation error exists in the OpenSSH server between versions 2.3.1 and 3.3 that can result in an integer overflow and privilege escalation. This error is found in the PAMAuthenticationViaKbdInt code in versions 2.3.1 to 3.3, and the ChallengeResponseAuthentication code in versions 2.9.9 to 3.3. OpenSSH 3.4 and later are not affected, and OpenSSH 3.2 and later prevent privilege escalation if UsePrivilegeSeparation is enabled; in OpenSSH 3.3 and higher this is the default behaviour of OpenSSH.
To protect yourself, users should be using OpenSSH 3.3 with UsePrivilegeSeparation enabled (see MDKSA:2002-040). However, it is highly recommended that all Mandrake Linux users upgrade to version 3.4 which corrects these errors.
There are a few caveats with this upgrade, however, that users should be aware of :
On Linux kernel 2.2 (the default for Mandrake Linux 7.x), the use of Compression and UsePrivilegeSeparation are mutually exclusive. You can use one feature or the other, not both; we recommend disabling Compression and using privsep until this can be resolved.
Using privsep may cause some PAM modules which expect to run with root privilege to fail. For instance, users will not be able to change their password if they attempt to log into an account with an expired password.
If you absolutely must use one of these features that conflict with privsep, you can disable it in /etc/ssh/sshd_config by using :
UsePrivilegeSeparation no
However, if you do this, be sure you are running OpenSSH 3.4. Updates to OpenSSH will be made available once these problems are resolved.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Mandrake Linux Security Advisory MDKSA-2002:040.
# The text itself is copyright (C) Mandriva S.A.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(13944);
script_version("1.21");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");
script_cve_id("CVE-2002-0639", "CVE-2002-0640");
script_xref(name:"MDKSA", value:"2002:040-1");
script_name(english:"Mandrake Linux Security Advisory : openssh (MDKSA-2002:040-1)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:
"The remote Mandrake Linux host is missing one or more security
updates."
);
script_set_attribute(
attribute:"description",
value:
"An input validation error exists in the OpenSSH server between
versions 2.3.1 and 3.3 that can result in an integer overflow and
privilege escalation. This error is found in the
PAMAuthenticationViaKbdInt code in versions 2.3.1 to 3.3, and the
ChallengeResponseAuthentication code in versions 2.9.9 to 3.3. OpenSSH
3.4 and later are not affected, and OpenSSH 3.2 and later prevent
privilege escalation if UsePrivilegeSeparation is enabled; in OpenSSH
3.3 and higher this is the default behaviour of OpenSSH.
To protect yourself, users should be using OpenSSH 3.3 with
UsePrivilegeSeparation enabled (see MDKSA:2002-040). However, it is
highly recommended that all Mandrake Linux users upgrade to version
3.4 which corrects these errors.
There are a few caveats with this upgrade, however, that users should
be aware of :
- On Linux kernel 2.2 (the default for Mandrake Linux
7.x), the use of Compression and UsePrivilegeSeparation
are mutually exclusive. You can use one feature or the
other, not both; we recommend disabling Compression and
using privsep until this can be resolved.
- Using privsep may cause some PAM modules which expect to
run with root privilege to fail. For instance, users
will not be able to change their password if they
attempt to log into an account with an expired password.
If you absolutely must use one of these features that conflict with
privsep, you can disable it in /etc/ssh/sshd_config by using :
UsePrivilegeSeparation no
However, if you do this, be sure you are running OpenSSH 3.4. Updates
to OpenSSH will be made available once these problems are resolved."
);
# http://marc.theaimsgroup.com/?l=openssh-unix-dev&m=102495293705094&w=2
script_set_attribute(
attribute:"see_also",
value:"https://marc.info/?l=openssh-unix-dev&m=102495293705094&w=2"
);
# http://web.archive.org/web/20030218003736/http://online.securityfocus.com:80/archive/1/280070/2002-06-29/2002-07-05/0
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?e2bfc14c"
);
script_set_attribute(attribute:"solution", value:"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:openssh");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:openssh-askpass");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:openssh-askpass-gnome");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:openssh-clients");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:openssh-server");
script_set_attribute(attribute:"cpe", value:"cpe:/o:mandrakesoft:mandrake_linux:7.1");
script_set_attribute(attribute:"cpe", value:"cpe:/o:mandrakesoft:mandrake_linux:7.2");
script_set_attribute(attribute:"cpe", value:"cpe:/o:mandrakesoft:mandrake_linux:8.0");
script_set_attribute(attribute:"cpe", value:"cpe:/o:mandrakesoft:mandrake_linux:8.1");
script_set_attribute(attribute:"cpe", value:"cpe:/o:mandrakesoft:mandrake_linux:8.2");
script_set_attribute(attribute:"patch_publication_date", value:"2002/07/02");
script_set_attribute(attribute:"plugin_publication_date", value:"2004/07/31");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2004-2021 Tenable Network Security, Inc.");
script_family(english:"Mandriva Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/Mandrake/release", "Host/Mandrake/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);
if (!get_kb_item("Host/Mandrake/release")) audit(AUDIT_OS_NOT, "Mandriva / Mandake Linux");
if (!get_kb_item("Host/Mandrake/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^(amd64|i[3-6]86|x86_64)$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Mandriva / Mandrake Linux", cpu);
flag = 0;
if (rpm_check(release:"MDK7.1", cpu:"i386", reference:"openssh-3.4p1-1.2mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK7.1", cpu:"i386", reference:"openssh-askpass-3.4p1-1.2mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK7.1", cpu:"i386", reference:"openssh-askpass-gnome-3.4p1-1.2mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK7.1", cpu:"i386", reference:"openssh-clients-3.4p1-1.2mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK7.1", cpu:"i386", reference:"openssh-server-3.4p1-1.2mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK7.2", cpu:"i386", reference:"openssh-3.4p1-1.2mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK7.2", cpu:"i386", reference:"openssh-askpass-3.4p1-1.2mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK7.2", cpu:"i386", reference:"openssh-askpass-gnome-3.4p1-1.2mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK7.2", cpu:"i386", reference:"openssh-clients-3.4p1-1.2mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK7.2", cpu:"i386", reference:"openssh-server-3.4p1-1.2mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.0", cpu:"i386", reference:"openssh-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.0", cpu:"i386", reference:"openssh-askpass-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.0", cpu:"i386", reference:"openssh-askpass-gnome-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.0", cpu:"i386", reference:"openssh-clients-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.0", cpu:"i386", reference:"openssh-server-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.1", cpu:"i386", reference:"openssh-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.1", cpu:"i386", reference:"openssh-askpass-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.1", cpu:"i386", reference:"openssh-askpass-gnome-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.1", cpu:"i386", reference:"openssh-clients-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.1", cpu:"i386", reference:"openssh-server-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.2", cpu:"i386", reference:"openssh-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.2", cpu:"i386", reference:"openssh-askpass-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.2", cpu:"i386", reference:"openssh-askpass-gnome-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.2", cpu:"i386", reference:"openssh-clients-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (rpm_check(release:"MDK8.2", cpu:"i386", reference:"openssh-server-3.4p1-1.1mdk", yank:"mdk")) flag++;
if (flag)
{
if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
else security_hole(0);
exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
97.7%