EulerOS 2.0 SP9 : c-ares (EulerOS-SA-2023-2575)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(179561);
  script_version("1.0");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/08/08");

  script_cve_id(
    "CVE-2023-31124",
    "CVE-2023-31130",
    "CVE-2023-31147",
    "CVE-2023-32067"
  );

  script_name(english:"EulerOS 2.0 SP9 : c-ares (EulerOS-SA-2023-2575)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the c-ares package installed, the EulerOS installation on the remote host is affected by
the following vulnerabilities :

  - c-ares is an asynchronous resolver library. When cross-compiling c-ares and using the autotools build
    system, CARES_RANDOM_FILE will not be set, as seen when cross compiling aarch64 android. This will
    downgrade to using rand() as a fallback which could allow an attacker to take advantage of the lack of
    entropy by not using a CSPRNG. This issue was patched in version 1.19.1. (CVE-2023-31124)

  - c-ares is an asynchronous resolver library. ares_inet_net_pton() is vulnerable to a buffer underflow for
    certain ipv6 addresses, in particular '0::00:00:00/2' was found to cause an issue. C-ares only uses this
    function internally for configuration purposes which would require an administrator to configure such an
    address via ares_set_sortlist(). However, users may externally use ares_inet_net_pton() for other purposes
    and thus be vulnerable to more severe issues. This issue has been fixed in 1.19.1. (CVE-2023-31130)

  - c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares
    uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not
    seeded by srand() so will generate predictable output. Input from the random number generator is fed into
    a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt
    is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has
    been fixed in version 1.19.1. (CVE-2023-31147)

  - c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target
    resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to
    the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the
    connection. This issue has been patched in version 1.19.1. (CVE-2023-32067)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security
advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional
issues.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2023-2575
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2b3df036");
  script_set_attribute(attribute:"solution", value:
"Update the affected c-ares packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N");
  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:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-31147");

  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:"2023/05/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/08/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/08/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:c-ares");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 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/cpu", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
  script_exclude_keys("Host/EulerOS/uvp_version");

  exit(0);
}

include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var _release = get_kb_item("Host/EulerOS/release");
if (isnull(_release) || _release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
var uvp = get_kb_item("Host/EulerOS/uvp_version");
if (_release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP9");

var sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(9)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP9");

if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP9", "EulerOS UVP " + uvp);

if (!get_kb_item("Host/EulerOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "aarch64" >!< cpu && "x86" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "x86" >!< cpu) audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

var flag = 0;

var pkgs = [
  "c-ares-1.16.0-1.h8.eulerosv2r9"
];

foreach (var pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"9", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "c-ares");
}