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Ubuntu: Security Advisory (USN-6138-1)

🗓️ 06 Jun 2023 00:00:00Reported by Copyright (C) 2023 Greenbone AGType 
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The 'libssh' package on Ubuntu 20.04, 22.04, 22.10, 23.04 is missing the necessary update (USN-6138-1) to fix vulnerabilities CVE-2023-1667 and CVE-2023-2283, which could allow a remote attacker to cause a denial of service or execute arbitrary code

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# SPDX-FileCopyrightText: 2023 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("1.3.6.1.4.1.25623.1.1.12.2023.6138.1");
  script_cve_id("CVE-2023-1667", "CVE-2023-2283");
  script_tag(name:"creation_date", value:"2023-06-06 04:09:27 +0000 (Tue, 06 Jun 2023)");
  script_version("2024-02-02T05:06:10+0000");
  script_tag(name:"last_modification", value:"2024-02-02 05:06:10 +0000 (Fri, 02 Feb 2024)");
  script_tag(name:"cvss_base", value:"6.4");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2023-06-06 14:54:27 +0000 (Tue, 06 Jun 2023)");

  script_name("Ubuntu: Security Advisory (USN-6138-1)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2023 Greenbone AG");
  script_family("Ubuntu Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/ubuntu_linux", "ssh/login/packages", re:"ssh/login/release=UBUNTU(20\.04\ LTS|22\.04\ LTS|22\.10|23\.04)");

  script_xref(name:"Advisory-ID", value:"USN-6138-1");
  script_xref(name:"URL", value:"https://ubuntu.com/security/notices/USN-6138-1");

  script_tag(name:"summary", value:"The remote host is missing an update for the 'libssh' package(s) announced via the USN-6138-1 advisory.");

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

  script_tag(name:"insight", value:"Philip Turnbull discovered that libssh incorrectly handled rekeying with
algorithm guessing. A remote attacker could use this issue to cause libssh
to crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2023-1667)

Kevin Backhouse discovered that libssh incorrectly handled verifying data
signatures. A remote attacker could possibly use this issue to bypass
authorization. (CVE-2023-2283)");

  script_tag(name:"affected", value:"'libssh' package(s) on Ubuntu 20.04, Ubuntu 22.04, Ubuntu 22.10, Ubuntu 23.04.");

  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-deb.inc");

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

res = "";
report = "";

if(release == "UBUNTU20.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"libssh-4", ver:"0.9.3-2ubuntu2.3", rls:"UBUNTU20.04 LTS"))) {
    report += res;
  }

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

if(release == "UBUNTU22.04 LTS") {

  if(!isnull(res = isdpkgvuln(pkg:"libssh-4", ver:"0.9.6-2ubuntu0.22.04.1", rls:"UBUNTU22.04 LTS"))) {
    report += res;
  }

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

if(release == "UBUNTU22.10") {

  if(!isnull(res = isdpkgvuln(pkg:"libssh-4", ver:"0.9.6-2ubuntu0.22.10.1", rls:"UBUNTU22.10"))) {
    report += res;
  }

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

if(release == "UBUNTU23.04") {

  if(!isnull(res = isdpkgvuln(pkg:"libssh-4", ver:"0.10.4-2ubuntu0.1", rls:"UBUNTU23.04"))) {
    report += res;
  }

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

exit(0);

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