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nessusThis script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.DEBIAN_DSA-5243.NASL
HistorySep 29, 2022 - 12:00 a.m.

Debian DSA-5243-1 : lighttpd - security update

2022-09-2900:00:00
This script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
17
debian 11
lighttpd
security update
denial of service
gw_backend.c
mod_wstunnel
null pointer dereference
vulnerability
remote code execution
nessus

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

EPSS

0.002

Percentile

62.2%

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5243 advisory.

  • A resource leak in gw_backend.c in lighttpd 1.4.56 through 1.4.66 could lead to a denial of service (connection-slot exhaustion) after a large amount of anomalous TCP behavior by clients. It is related to RDHUP mishandling in certain HTTP/1.1 chunked situations. Use of mod_fastcgi is, for example, affected.
    This is fixed in 1.4.67. (CVE-2022-41556)

  • In lighttpd 1.4.65, mod_wstunnel does not initialize a handler function pointer if an invalid HTTP request (websocket handshake) is received. It leads to null pointer dereference which crashes the server. It could be used by an external attacker to cause denial of service condition. (CVE-2022-37797)

Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dsa-5243. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(165548);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/10");

  script_cve_id("CVE-2022-37797", "CVE-2022-41556");

  script_name(english:"Debian DSA-5243-1 : lighttpd - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dsa-5243 advisory.

  - A resource leak in gw_backend.c in lighttpd 1.4.56 through 1.4.66 could lead to a denial of service
    (connection-slot exhaustion) after a large amount of anomalous TCP behavior by clients. It is related to
    RDHUP mishandling in certain HTTP/1.1 chunked situations. Use of mod_fastcgi is, for example, affected.
    This is fixed in 1.4.67. (CVE-2022-41556)

  - In lighttpd 1.4.65, mod_wstunnel does not initialize a handler function pointer if an invalid HTTP request
    (websocket handshake) is received. It leads to null pointer dereference which crashes the server. It could
    be used by an external attacker to cause denial of service condition. (CVE-2022-37797)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/lighttpd");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2022/dsa-5243");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2022-37797");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2022-41556");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/lighttpd");
  script_set_attribute(attribute:"solution", value:
"Upgrade the lighttpd packages.

For the stable distribution (bullseye), these problems have been fixed in version 1.4.59-1+deb11u2.");
  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:"cvss_score_source", value:"CVE-2022-41556");

  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:"2022/09/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/09/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/09/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-authn-gssapi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-authn-pam");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-authn-sasl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-cml");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-deflate");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-geoip");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-magnet");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-maxminddb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-mbedtls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-nss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-trigger-b4-dl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-vhostdb-dbi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-vhostdb-pgsql");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-webdav");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-mod-wolfssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-modules-dbi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-modules-ldap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-modules-lua");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:lighttpd-modules-mysql");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Debian Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

include('debian_package.inc');

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

var release = get_kb_item('Host/Debian/release');
if ( isnull(release) ) audit(AUDIT_OS_NOT, 'Debian');
var release = chomp(release);
if (! preg(pattern:"^(11)\.[0-9]+", string:release)) audit(AUDIT_OS_NOT, 'Debian 11.0', 'Debian ' + release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '11.0', 'prefix': 'lighttpd', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-doc', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-authn-gssapi', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-authn-pam', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-authn-sasl', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-cml', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-deflate', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-geoip', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-magnet', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-maxminddb', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-mbedtls', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-nss', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-openssl', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-trigger-b4-dl', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-vhostdb-dbi', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-vhostdb-pgsql', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-webdav', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-mod-wolfssl', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-modules-dbi', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-modules-ldap', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-modules-lua', 'reference': '1.4.59-1+deb11u2'},
    {'release': '11.0', 'prefix': 'lighttpd-modules-mysql', 'reference': '1.4.59-1+deb11u2'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (release && prefix && reference) {
    if (deb_check(release:release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'lighttpd / lighttpd-doc / lighttpd-mod-authn-gssapi / etc');
}
VendorProductVersionCPE
debiandebian_linuxlighttpdp-cpe:/a:debian:debian_linux:lighttpd
debiandebian_linuxlighttpd-docp-cpe:/a:debian:debian_linux:lighttpd-doc
debiandebian_linuxlighttpd-mod-authn-gssapip-cpe:/a:debian:debian_linux:lighttpd-mod-authn-gssapi
debiandebian_linuxlighttpd-mod-authn-pamp-cpe:/a:debian:debian_linux:lighttpd-mod-authn-pam
debiandebian_linuxlighttpd-mod-authn-saslp-cpe:/a:debian:debian_linux:lighttpd-mod-authn-sasl
debiandebian_linuxlighttpd-mod-cmlp-cpe:/a:debian:debian_linux:lighttpd-mod-cml
debiandebian_linuxlighttpd-mod-deflatep-cpe:/a:debian:debian_linux:lighttpd-mod-deflate
debiandebian_linuxlighttpd-mod-geoipp-cpe:/a:debian:debian_linux:lighttpd-mod-geoip
debiandebian_linuxlighttpd-mod-magnetp-cpe:/a:debian:debian_linux:lighttpd-mod-magnet
debiandebian_linuxlighttpd-mod-maxminddbp-cpe:/a:debian:debian_linux:lighttpd-mod-maxminddb
Rows per page:
1-10 of 231

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

EPSS

0.002

Percentile

62.2%