EulerOS Virtualization 2.10.1 : curl (EulerOS-SA-2026-2816)

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

include('compat.inc');

if (description)
{
  script_id(328608);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/21");

  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 Virtualization 2.10.1 : curl (EulerOS-SA-2026-2816)");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS Virtualization host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the curl packages installed, the EulerOS Virtualization 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 Virtualization 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-2026-2816
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?41b5d2be");
  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:"2026/07/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/21");

  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:libcurl");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:2.10.1");
  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/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 (uvp != "2.10.1") audit(AUDIT_OS_NOT, "EulerOS Virtualization 2.10.1");
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 ("aarch64" >!< cpu) audit(AUDIT_ARCH_NOT, "aarch64", cpu);

var flag = 0;

var pkgs = [
  "curl-7.71.1-4.h31.r9.eulerosv2r10",
  "libcurl-7.71.1-4.h31.r9.eulerosv2r10"
];

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