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nessusThis script is Copyright (C) 2018-2022 and is owned by Tenable, Inc. or an Affiliate thereof.DEBIAN_DSA-4309.NASL
HistoryOct 03, 2018 - 12:00 a.m.

Debian DSA-4309-1 : strongswan - security update

2018-10-0300:00:00
This script is Copyright (C) 2018-2022 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
12

CVSS2

5

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.011

Percentile

84.3%

Google’s OSS-Fuzz revealed an exploitable bug in the gmp plugin caused by the patch that fixes CVE-2018-16151 and CVE-2018-16152 (DSA-4305-1).

An attacker could trigger it using crafted certificates with RSA keys with very small moduli. Verifying signatures with such keys would cause an integer underflow and subsequent heap buffer overflow resulting in a crash of the daemon. While arbitrary code execution is not completely ruled out because of the heap buffer overflow, due to the form of the data written to the buffer it seems difficult to actually exploit it in such a way.

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-4309. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(117890);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/02/17");

  script_cve_id("CVE-2018-17540");
  script_xref(name:"DSA", value:"4309");

  script_name(english:"Debian DSA-4309-1 : strongswan - security update");
  script_summary(english:"Checks dpkg output for the updated package");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Debian host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"Google's OSS-Fuzz revealed an exploitable bug in the gmp plugin caused
by the patch that fixes CVE-2018-16151 and CVE-2018-16152
(DSA-4305-1).

An attacker could trigger it using crafted certificates with RSA keys
with very small moduli. Verifying signatures with such keys would
cause an integer underflow and subsequent heap buffer overflow
resulting in a crash of the daemon. While arbitrary code execution is
not completely ruled out because of the heap buffer overflow, due to
the form of the data written to the buffer it seems difficult to
actually exploit it in such a way."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-16151"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-16152"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/strongswan"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/strongswan"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2018/dsa-4309"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"Upgrade the strongswan packages.

For the stable distribution (stretch), this problem has been fixed in
version 5.5.1-4+deb9u4."
  );
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-17540");
  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:"p-cpe:/a:debian:debian_linux:strongswan");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/10/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/10/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/10/03");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"9.0", prefix:"charon-cmd", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"charon-systemd", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libcharon-extra-plugins", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libstrongswan", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libstrongswan-extra-plugins", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libstrongswan-standard-plugins", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-charon", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-ike", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-ikev1", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-ikev2", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-libcharon", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-nm", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-pki", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-scepclient", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-starter", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-swanctl", reference:"5.5.1-4+deb9u4")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
VendorProductVersionCPE
debiandebian_linuxstrongswanp-cpe:/a:debian:debian_linux:strongswan
debiandebian_linux9.0cpe:/o:debian:debian_linux:9.0

CVSS2

5

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.011

Percentile

84.3%