EulerOS 2.0 SP10 : curl (EulerOS-SA-2026-2644)

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

include('compat.inc');

if (description)
{
  script_id(326602);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/14");

  script_cve_id(
    "CVE-2026-1965",
    "CVE-2026-3783",
    "CVE-2026-3784",
    "CVE-2026-5773",
    "CVE-2026-6276"
  );
  script_xref(name:"IAVA", value:"2026-A-0237-S");
  script_xref(name:"IAVA", value:"2026-A-0397-S");

  script_name(english:"EulerOS 2.0 SP10 : curl (EulerOS-SA-2026-2644)");

  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 might in some circumstances reuse the wrong connection for SMB(S)
    transfers.

    libcurl features a pool of recent connections so that subsequent requests can
    reuse an existing connection to avoid overhead.

    When reusing a connection a range of criteria must be met. Due to a logical
    error in the code, a network transfer operation that was requested by an
    application could wrongfully reuse an existing SMB connection to the same
    server that was using a different 'share' than the new subsequent transfer
    should.

    This could in unlucky situations lead to the download of the wrong file or the
    upload of a file to the wrong place. When this happens, the same credentials
    are used and the server name is the same.(CVE-2026-5773)

    Using libcurl, when a custom `Host:` header is first set for an HTTP request
    and a second request is subsequently done using the same *easy handle* but
    without the custom `Host:` header set, the second request would use stale
    information and pass on cookies meant for the first host in the second
    request. Leak them.(CVE-2026-6276)

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

    libcurl can in some circumstances reuse the wrong connection when asked to do
    an Negotiate-authenticated HTTP or HTTPS request.

    libcurl features a pool of recent connections so that subsequent requests can
    reuse an existing connection to avoid overhead.

    When reusing a connection a range of criterion must first be met. Due to a
    logical error in the code, a request that was issued by an application could
    wrongfully reuse an existing connection to the same server that was
    authenticated using different credentials. One underlying reason being that
    Negotiate sometimes authenticates *connections* and not *requests*, contrary
    to how HTTP is designed to work.

    An application that allows Negotiate authentication to a server (that responds
    wanting Negotiate) with `user1:password1` and then does another operation to
    the same server also using Negotiate but with `user2:password2` (while the
    previous connection is still alive) - the second request wrongly reused the
    same connection and since it then sees that the Negotiate negotiation is
    already made, it just sends the request over that connection thinking it uses
    the user2 credentials when it is in fact still using the connection
    authenticated for user1...

    The set of authentication methods to use is set with  `CURLOPT_HTTPAUTH`.

    Applications can disable libcurl's reuse of connections and thus mitigate this
    problem, by using one of the following libcurl options to alter how
    connections are or are not reused: `CURLOPT_FRESH_CONNECT`,
    `CURLOPT_MAXCONNECTS` and `CURLMOPT_MAX_HOST_CONNECTIONS` (if using the
    curl_multi API).(CVE-2026-1965)

    When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer
    performs a redirect to a second URL, curl could leak that token to the second
    hostname under some circumstances.

    If the hostname that the first request is redirected to has information in the
    used .netrc file, with either of the `machine` or `default` keywords, curl
    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-2026-2644
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?99a290d8");
  script_set_attribute(attribute:"solution", value:
"Update the affected curl packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/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:H/I:N/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-2026-5773");

  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:"2026/07/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/14");

  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_set_attribute(attribute:"stig_severity", value:"I");
  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 SP10");

var sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(10)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP10");

if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP10", "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-7.71.1-4.h31.r9.eulerosv2r10",
  "curl-help-7.71.1-4.h31.r9.eulerosv2r10",
  "libcurl-7.71.1-4.h31.r9.eulerosv2r10",
  "libcurl-devel-7.71.1-4.h31.r9.eulerosv2r10"
];

foreach (var pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"10", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    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");
}