EulerOS 2.0 SP13 : curl (EulerOS-SA-2026-2283)

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

include('compat.inc');

if (description)
{
  script_id(320296);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/10");

  script_cve_id("CVE-2026-1965", "CVE-2026-3783", "CVE-2026-3784");

  script_name(english:"EulerOS 2.0 SP13 : curl (EulerOS-SA-2026-2283)");

  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 curl packages installed, the EulerOS installation on the remote host is affected by the
following vulnerabilities :

    libcurl can in some circumstances reuse the wrong connection when asked to do_x000D_
    an Negotiate-authenticated HTTP or HTTPS request._x000D_
    _x000D_
    libcurl features a pool of recent connections so that subsequent requests can_x000D_
    reuse an existing connection to avoid overhead._x000D_
    _x000D_
    When reusing a connection a range of criterion must first be met. Due to a_x000D_
    logical error in the code, a request that was issued by an application could_x000D_
    wrongfully reuse an existing connection to the same server that was_x000D_
    authenticated using different credentials. One underlying reason being that_x000D_
    Negotiate sometimes authenticates *connections* and not *requests*, contrary_x000D_
    to how HTTP is designed to work._x000D_
    _x000D_
    An application that allows Negotiate authentication to a server (that responds_x000D_
    wanting Negotiate) with `user1:password1` and then does another operation to_x000D_
    the same server also using Negotiate but with `user2:password2` (while the_x000D_
    previous connection is still alive) - the second request wrongly reused the_x000D_
    same connection and since it then sees that the Negotiate negotiation is_x000D_
    already made, it just sends the request over that connection thinking it uses_x000D_
    the user2 credentials when it is in fact still using the connection_x000D_
    authenticated for user1..._x000D_
    _x000D_
    The set of authentication methods to use is set with  `CURLOPT_HTTPAUTH`._x000D_
    _x000D_
    Applications can disable libcurl's reuse of connections and thus mitigate this_x000D_
    problem, by using one of the following libcurl options to alter how_x000D_
    connections are or are not reused: `CURLOPT_FRESH_CONNECT`,_x000D_
    `CURLOPT_MAXCONNECTS` and `CURLMOPT_MAX_HOST_CONNECTIONS` (if using the_x000D_
    curl_multi API).(CVE-2026-1965)

    curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a_x000D_
    server, even if the new request uses different credentials for the HTTP proxy._x000D_
    The proper behavior is to create or use a separate connection.(CVE-2026-3784)

    When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer_x000D_
    performs a redirect to a second URL, curl could leak that token to the second_x000D_
    hostname under some circumstances._x000D_
    _x000D_
    If the hostname that the first request is redirected to has information in the_x000D_
    used .netrc file, with either of the `machine` or `default` keywords, curl_x000D_
    would pass on the bearer token set for the first host also to the second one.(CVE-2026-3783)

Tenable has extracted the preceding description block directly from the EulerOS curl security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2026-2283
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e4702fc1");
  script_set_attribute(attribute:"solution", value:
"Update the affected curl packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:C/A:N");
  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:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-1965");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-3784");

  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:"2026/03/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:curl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:curl-help");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libcurl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libcurl-devel");
  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) 2026 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 SP13");

var sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(13)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP13");

if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP13", "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 = [
  "curl-7.79.1-25.h20.eulerosv2r13",
  "curl-help-7.79.1-25.h20.eulerosv2r13",
  "libcurl-7.79.1-25.h20.eulerosv2r13",
  "libcurl-devel-7.79.1-25.h20.eulerosv2r13"
];

foreach (var pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"13", 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, "curl");
}