The remote host is missing an update for the
# SPDX-FileCopyrightText: 2024 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("1.3.6.1.4.1.25623.1.1.10.2024.0004");
script_cve_id("CVE-2023-48795");
script_tag(name:"creation_date", value:"2024-01-09 04:12:12 +0000 (Tue, 09 Jan 2024)");
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("Mageia: Security Advisory (MGASA-2024-0004)");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2024 Greenbone AG");
script_family("Mageia Linux Local Security Checks");
script_dependencies("gather-package-list.nasl");
script_mandatory_keys("ssh/login/mageia_linux", "ssh/login/release", re:"ssh/login/release=MAGEIA9");
script_xref(name:"Advisory-ID", value:"MGASA-2024-0004");
script_xref(name:"URL", value:"https://advisories.mageia.org/MGASA-2024-0004.html");
script_xref(name:"URL", value:"https://bugs.mageia.org/show_bug.cgi?id=32656");
script_xref(name:"URL", value:"https://github.com/mkj/dropbear/commit/6e43be5c7b99dbee49dc72b6f989f29fdd7e9356");
script_tag(name:"summary", value:"The remote host is missing an update for the 'dropbear' package(s) announced via the MGASA-2024-0004 advisory.");
script_tag(name:"vuldetect", value:"Checks if a vulnerable package version is present on the target host.");
script_tag(name:"insight", value:"Parts of the SSH specification are vulnerable to a novel prefix
truncation attack (a.k.a. Terrapin attack), which allows a
man-in-the-middle attacker to strip an arbitrary number of messages
right after the initial key exchange, breaking SSH extension negotiation
(RFC8308) in the process and thus downgrading connection security.
### Mitigations
To mitigate this protocol vulnerability, OpenSSH suggested a so-called
'strict kex' which alters the SSH handshake to ensure a
Man-in-the-Middle attacker cannot introduce unauthenticated messages as
well as convey sequence number manipulation across handshakes. Support
for strict key exchange has been added to a variety of SSH
implementations, including OpenSSH itself, PuTTY, libssh, and more.
This release includes a patch to implement Strict KEX mode.");
script_tag(name:"affected", value:"'dropbear' package(s) on Mageia 9.");
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 == "MAGEIA9") {
if(!isnull(res = isrpmvuln(pkg:"dropbear", rpm:"dropbear~2022.83~2.1.mga9", rls:"MAGEIA9"))) {
report += res;
}
if(report != "") {
security_message(data:report);
} else if(__pkg_match) {
exit(99);
}
exit(0);
}
exit(0);