Debian: Security Advisory (DSA-5588-1)

# 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("1.3.6.1.4.1.25623.1.1.1.1.2023.5588");
  script_cve_id("CVE-2023-48795");
  script_tag(name:"creation_date", value:"2023-12-25 04:20:13 +0000 (Mon, 25 Dec 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:"5.4");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:H/Au:N/C:N/I:C/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2023-12-28 18:26:44 +0000 (Thu, 28 Dec 2023)");

  script_name("Debian: Security Advisory (DSA-5588-1)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2023 Greenbone AG");
  script_family("Debian Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/debian_linux", "ssh/login/packages", re:"ssh/login/release=DEB(11|12)");

  script_xref(name:"Advisory-ID", value:"DSA-5588-1");
  script_xref(name:"URL", value:"https://www.debian.org/security/2023/DSA-5588-1");
  script_xref(name:"URL", value:"https://security-tracker.debian.org/tracker/DSA-5588");
  script_xref(name:"URL", value:"https://terrapin-attack.com/");
  script_xref(name:"URL", value:"https://security-tracker.debian.org/tracker/putty");

  script_tag(name:"summary", value:"The remote host is missing an update for the Debian 'putty' package(s) announced via the DSA-5588-1 advisory.");

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

  script_tag(name:"insight", value:"Fabian Baeumer, Marcus Brinkmann and Joerg Schwenk discovered that the SSH protocol is prone to a prefix truncation attack, known as the Terrapin attack. This attack allows a MITM attacker to effect a limited break of the integrity of the early encrypted SSH transport protocol by sending extra messages prior to the commencement of encryption, and deleting an equal number of consecutive messages immediately after encryption starts.

Details can be found at [link moved to references].

For the oldstable distribution (bullseye), these problems have been fixed in version 0.74-1+deb11u1. This update includes a fix for CVE-2021-36367.

For the stable distribution (bookworm), these problems have been fixed in version 0.78-2+deb12u1.

We recommend that you upgrade your putty packages.

For the detailed security status of putty please refer to its security tracker page at: [link moved to references]");

  script_tag(name:"affected", value:"'putty' package(s) on Debian 11, Debian 12.");

  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 == "DEB11") {

  if(!isnull(res = isdpkgvuln(pkg:"pterm", ver:"0.74-1+deb11u1", rls:"DEB11"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"putty", ver:"0.74-1+deb11u1", rls:"DEB11"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"putty-doc", ver:"0.74-1+deb11u1", rls:"DEB11"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"putty-tools", ver:"0.74-1+deb11u1", rls:"DEB11"))) {
    report += res;
  }

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

if(release == "DEB12") {

  if(!isnull(res = isdpkgvuln(pkg:"pterm", ver:"0.78-2+deb12u1", rls:"DEB12"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"putty", ver:"0.78-2+deb12u1", rls:"DEB12"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"putty-doc", ver:"0.78-2+deb12u1", rls:"DEB12"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"putty-tools", ver:"0.78-2+deb12u1", rls:"DEB12"))) {
    report += res;
  }

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

exit(0);