Debian DSA-5041-1 : cfrpki - security update

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dsa-5041. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(156636);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/01/12");

  script_cve_id(
    "CVE-2021-3761",
    "CVE-2021-3907",
    "CVE-2021-3908",
    "CVE-2021-3909",
    "CVE-2021-3910",
    "CVE-2021-3911",
    "CVE-2021-3912",
    "CVE-2021-43173",
    "CVE-2021-43174"
  );

  script_name(english:"Debian DSA-5041-1 : cfrpki - 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 a package installed that is affected by multiple vulnerabilities as referenced in the
dsa-5041 advisory.

  - Any CA issuer in the RPKI can trick OctoRPKI prior to 1.3.0 into emitting an invalid VRP MaxLength
    value, causing RTR sessions to terminate. An attacker can use this to disable RPKI Origin Validation in a
    victim network (for example AS 13335 - Cloudflare) prior to launching a BGP hijack which during normal
    operations would be rejected as RPKI invalid. Additionally, in certain deployments RTR session flapping
    in and of itself also could cause BGP routing churn, causing availability issues. (CVE-2021-3761)

  - OctoRPKI does not escape a URI with a filename containing .., this allows a repository to create a file,
    (ex. rsync://example.org/repo/../../etc/cron.daily/evil.roa), which would then be written to disk outside
    the base cache folder. This could allow for remote code execution on the host machine OctoRPKI is running
    on. (CVE-2021-3907)

  - OctoRPKI does not limit the depth of a certificate chain, allowing for a CA to create children in an ad-
    hoc fashion, thereby making tree traversal never end. (CVE-2021-3908)

  - OctoRPKI does not limit the length of a connection, allowing for a slowloris DOS attack to take place
    which makes OctoRPKI wait forever. Specifically, the repository that OctoRPKI sends HTTP requests to will
    keep the connection open for a day before a response is returned, but does keep drip feeding new bytes to
    keep the connection alive. (CVE-2021-3909)

  - OctoRPKI crashes when encountering a repository that returns an invalid ROA (just an encoded NUL (\0)
    character). (CVE-2021-3910)

  - If the ROA that a repository returns contains too many bits for the IP address then OctoRPKI will crash.
    (CVE-2021-3911)

  - OctoRPKI tries to load the entire contents of a repository in memory, and in the case of a GZIP bomb,
    unzip it in memory, making it possible to create a repository that makes OctoRPKI run out of memory (and
    thus crash). (CVE-2021-3912)

  - In NLnet Labs Routinator prior to 0.10.2, a validation run can be delayed significantly by an RRDP
    repository by not answering but slowly drip-feeding bytes to keep the connection alive. This can be used
    to effectively stall validation. While Routinator has a configurable time-out value for RRDP connections,
    this time-out was only applied to individual read or write operations rather than the complete request.
    Thus, if an RRDP repository sends a little bit of data before that time-out expired, it can continuously
    extend the time it takes for the request to finish. Since validation will only continue once the update of
    an RRDP repository has concluded, this delay will cause validation to stall, leading to Routinator
    continuing to serve the old data set or, if in the initial validation run directly after starting, never
    serve any data at all. (CVE-2021-43173)

  - NLnet Labs Routinator versions 0.9.0 up to and including 0.10.1, support the gzip transfer encoding when
    querying RRDP repositories. This encoding can be used by an RRDP repository to cause an out-of-memory
    crash in these versions of Routinator. RRDP uses XML which allows arbitrary amounts of white space in the
    encoded data. The gzip scheme compresses such white space extremely well, leading to very small compressed
    files that become huge when being decompressed for further processing, big enough that Routinator runs out
    of memory when parsing input data waiting for the next XML element. (CVE-2021-43174)

Note that Nessus has not tested for this issue 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/cfrpki");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2022/dsa-5041");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-3761");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-3907");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-3908");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-3909");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-3910");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-3911");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-3912");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-43173");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-43174");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/cfrpki");
  script_set_attribute(attribute:"solution", value:
"Upgrade the cfrpki packages.

For the stable distribution (bullseye), these problems have been fixed in version 1.4.2-1~deb11u1.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/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:H/I:H/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-2021-3907");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/09/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/01/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/01/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:octorpki");
  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 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('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/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': 'octorpki', 'reference': '1.4.2-1~deb11u1'}
];

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, 'octorpki');
}