Huawei EulerOS: Security Advisory for unbound (EulerOS-SA-2025-2567)

# SPDX-FileCopyrightText: 2025 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.1.2.2025.2567");
  script_cve_id("CVE-2025-5994");
  script_tag(name:"creation_date", value:"2025-12-19 04:38:02 +0000 (Fri, 19 Dec 2025)");
  script_version("2025-12-19T05:45:49+0000");
  script_tag(name:"last_modification", value:"2025-12-19 05:45:49 +0000 (Fri, 19 Dec 2025)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:N/A:N");

  script_name("Huawei EulerOS: Security Advisory for unbound (EulerOS-SA-2025-2567)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2025 Greenbone AG");
  script_family("Huawei EulerOS Local Security Checks");
  script_dependencies("gb_huawei_euleros_consolidation.nasl");
  script_mandatory_keys("ssh/login/euleros", "ssh/login/rpms", re:"ssh/login/release=EULEROSVIRT\-2\.13\.1");

  script_xref(name:"Advisory-ID", value:"EulerOS-SA-2025-2567");
  script_xref(name:"URL", value:"https://developer.huaweicloud.com/intl/en-us/euleros/securitydetail.html?secId=EulerOS-SA-2025-2567");

  script_tag(name:"summary", value:"The remote host is missing an update for the Huawei EulerOS 'unbound' package(s) announced via the EulerOS-SA-2025-2567 advisory.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable package version is present on the target host.");

  script_tag(name:"insight", value:"A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to upstream name servers, i.e., at least one of the 'send-client-subnet', 'client-subnet-zone' or 'client-subnet-always-forward' options is used. Resolvers supporting ECS need to segregate outgoing queries to accommodate for different outgoing ECS information. This re-opens up resolvers to a birthday paradox attack (Rebirthday Attack) that tries to match the DNS transaction ID in order to cache non-ECS poisonous replies.(CVE-2025-5994)");

  script_tag(name:"affected", value:"'unbound' package(s) on Huawei EulerOS Virtualization release 2.13.1.");

  script_tag(name:"solution", value:"Please install the updated package(s).");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"package");

  exit(0);
}

include("revisions-lib.inc");
include("pkg-lib-rpm.inc");

release = rpm_get_ssh_release();
if(!release)
  exit(0);

res = "";
report = "";

if(release == "EULEROSVIRT-2.13.1") {

  if(!isnull(res = isrpmvuln(pkg:"python3-unbound", rpm:"python3-unbound~1.13.2~8.h8.eulerosv2r13", rls:"EULEROSVIRT-2.13.1"))) {
    report += res;
  }

  if(!isnull(res = isrpmvuln(pkg:"unbound-libs", rpm:"unbound-libs~1.13.2~8.h8.eulerosv2r13", rls:"EULEROSVIRT-2.13.1"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if(__pkg_match) {
    exit(99);
  }
  exit(0);
}

exit(0);