CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
AI Score
Confidence
High
EPSS
Percentile
39.9%
It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2024-540 advisory.
uv_getaddrinfo
function in src/unix/getaddrinfo.c
(and its windows counterpart src/win/getaddrinfo.c
), truncates hostnames to 256 characters before calling getaddrinfo
. This behavior can be exploited to create addresses like 0x00007f000001
, which are considered valid by getaddrinfo
and could allow an attacker to craft payloads that resolve to unintended IP addresses, bypassing developer checks. The vulnerability arises due to how the hostname_ascii
variable (with a length of 256 bytes) is handled in uv_getaddrinfo
and subsequently in uv__idna_toascii
. When the hostname exceeds 256 characters, it gets truncated without a terminating null byte. As a result attackers may be able to access internal APIs or for websites (similar to MySpace) that allows users to have username.example.com
pages. Internal services that crawl or cache these user pages can be exposed to SSRF attacks if a malicious user chooses a long vulnerable username.Note that Nessus has not tested for this issue but has instead relied only on the applicationโs self-reported version number.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2024-540.
##
include('compat.inc');
if (description)
{
script_id(191599);
script_version("1.1");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/06");
script_cve_id("CVE-2024-24806");
script_name(english:"Amazon Linux 2023 : libuv, libuv-devel, libuv-static (ALAS2023-2024-540)");
script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2023 host is missing a security update.");
script_set_attribute(attribute:"description", value:
"It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2024-540 advisory.
- libuv is a multi-platform support library with a focus on asynchronous I/O. The `uv_getaddrinfo` function
in `src/unix/getaddrinfo.c` (and its windows counterpart `src/win/getaddrinfo.c`), truncates hostnames to
256 characters before calling `getaddrinfo`. This behavior can be exploited to create addresses like
`0x00007f000001`, which are considered valid by `getaddrinfo` and could allow an attacker to craft
payloads that resolve to unintended IP addresses, bypassing developer checks. The vulnerability arises due
to how the `hostname_ascii` variable (with a length of 256 bytes) is handled in `uv_getaddrinfo` and
subsequently in `uv__idna_toascii`. When the hostname exceeds 256 characters, it gets truncated without a
terminating null byte. As a result attackers may be able to access internal APIs or for websites (similar
to MySpace) that allows users to have `username.example.com` pages. Internal services that crawl or cache
these user pages can be exposed to SSRF attacks if a malicious user chooses a long vulnerable username.
This issue has been addressed in release version 1.48.0. Users are advised to upgrade. There are no known
workarounds for this vulnerability. (CVE-2024-24806)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/AL2023/ALAS-2024-540.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2024-24806.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
script_set_attribute(attribute:"solution", value:
"Run 'dnf update libuv --releasever 2023.3.20240304' to update your system.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
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:L/I:L/A:L");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-24806");
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:"2024/02/07");
script_set_attribute(attribute:"patch_publication_date", value:"2024/02/29");
script_set_attribute(attribute:"plugin_publication_date", value:"2024/03/06");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libuv");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libuv-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libuv-debugsource");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libuv-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libuv-static");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2023");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Amazon Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");
exit(0);
}
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "-2023")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux 2023", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
var pkgs = [
{'reference':'libuv-1.47.0-1.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libuv-1.47.0-1.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libuv-debuginfo-1.47.0-1.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libuv-debuginfo-1.47.0-1.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libuv-debugsource-1.47.0-1.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libuv-debugsource-1.47.0-1.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libuv-devel-1.47.0-1.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libuv-devel-1.47.0-1.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libuv-static-1.47.0-1.amzn2023.0.2', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
{'reference':'libuv-static-1.47.0-1.amzn2023.0.2', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE}
];
var flag = 0;
foreach var package_array ( pkgs ) {
var reference = NULL;
var _release = NULL;
var sp = NULL;
var _cpu = NULL;
var el_string = NULL;
var rpm_spec_vers_cmp = NULL;
var epoch = NULL;
var allowmaj = NULL;
var exists_check = NULL;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) _release = package_array['release'];
if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) 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, "libuv / libuv-debuginfo / libuv-debugsource / etc");
}
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
AI Score
Confidence
High
EPSS
Percentile
39.9%