The remote Ubuntu 20.04 LTS / 22.04 LTS / 23.04 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6233-2 advisory.
In the yajl-ruby gem 1.3.0 for Ruby, when a crafted JSON file is supplied to Yajl::Parser.new.parse, the whole ruby process crashes with a SIGABRT in the yajl_string_decode function in yajl_encode.c. This results in the whole ruby process terminating and potentially a denial of service. (CVE-2017-16516)
yajl-ruby is a C binding to the YAJL JSON parsing and generation library. The 1.x branch and the 2.x branch of yajl
contain an integer overflow which leads to subsequent heap memory corruption when dealing with large (~2GB) inputs. The reallocation logic at yajl_buf.c#L64
may result in the need
32bit integer wrapping to 0 when need
approaches a value of 0x80000000 (i.e. ~2GB of data), which results in a reallocation of buf->alloc into a small heap chunk. These integers are declared as size_t
in the 2.x branch of yajl
, which practically prevents the issue from triggering on 64bit platforms, however this does not preclude this issue triggering on 32bit builds on which size_t
is a 32bit integer. Subsequent population of this under-allocated heap chunk is based on the original buffer size, leading to heap memory corruption. This vulnerability mostly impacts process availability. Maintainers believe exploitation for arbitrary code execution is unlikely. A patch is available and anticipated to be part of yajl-ruby version 1.4.2. As a workaround, avoid passing large inputs to YAJL. (CVE-2022-24795)
There’s a memory leak in yajl 2.1.0 with use of yajl_tree_parse function. which will cause out-of-memory in server and cause crash. (CVE-2023-33460)
Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-6233-2. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##
include('compat.inc');
if (description)
{
script_id(186986);
script_version("1.1");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/21");
script_cve_id("CVE-2017-16516", "CVE-2022-24795", "CVE-2023-33460");
script_xref(name:"USN", value:"6233-2");
script_name(english:"Ubuntu 20.04 LTS / 22.04 LTS / 23.04 : YAJL vulnerabilities (USN-6233-2)");
script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
script_set_attribute(attribute:"description", value:
"The remote Ubuntu 20.04 LTS / 22.04 LTS / 23.04 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-6233-2 advisory.
- In the yajl-ruby gem 1.3.0 for Ruby, when a crafted JSON file is supplied to Yajl::Parser.new.parse, the
whole ruby process crashes with a SIGABRT in the yajl_string_decode function in yajl_encode.c. This
results in the whole ruby process terminating and potentially a denial of service. (CVE-2017-16516)
- yajl-ruby is a C binding to the YAJL JSON parsing and generation library. The 1.x branch and the 2.x
branch of `yajl` contain an integer overflow which leads to subsequent heap memory corruption when dealing
with large (~2GB) inputs. The reallocation logic at `yajl_buf.c#L64` may result in the `need` 32bit
integer wrapping to 0 when `need` approaches a value of 0x80000000 (i.e. ~2GB of data), which results in a
reallocation of buf->alloc into a small heap chunk. These integers are declared as `size_t` in the 2.x
branch of `yajl`, which practically prevents the issue from triggering on 64bit platforms, however this
does not preclude this issue triggering on 32bit builds on which `size_t` is a 32bit integer. Subsequent
population of this under-allocated heap chunk is based on the original buffer size, leading to heap memory
corruption. This vulnerability mostly impacts process availability. Maintainers believe exploitation for
arbitrary code execution is unlikely. A patch is available and anticipated to be part of yajl-ruby version
1.4.2. As a workaround, avoid passing large inputs to YAJL. (CVE-2022-24795)
- There's a memory leak in yajl 2.1.0 with use of yajl_tree_parse function. which will cause out-of-memory
in server and cause crash. (CVE-2023-33460)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-6233-2");
script_set_attribute(attribute:"solution", value:
"Update the affected libyajl-dev, libyajl2 and / or yajl-tools packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
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:N/I:N/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-24795");
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:"2017/11/03");
script_set_attribute(attribute:"patch_publication_date", value:"2023/12/14");
script_set_attribute(attribute:"plugin_publication_date", value:"2023/12/15");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:23.04");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libyajl-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libyajl2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:yajl-tools");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Ubuntu Local Security Checks");
script_copyright(english:"Ubuntu Security Notice (C) 2023 Canonical, Inc. / NASL script (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");
exit(0);
}
include('debian_package.inc');
if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('20.04' >< os_release || '22.04' >< os_release || '23.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 20.04 / 22.04 / 23.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);
var pkgs = [
{'osver': '20.04', 'pkgname': 'libyajl-dev', 'pkgver': '2.1.0-3ubuntu0.20.04.1'},
{'osver': '20.04', 'pkgname': 'libyajl2', 'pkgver': '2.1.0-3ubuntu0.20.04.1'},
{'osver': '20.04', 'pkgname': 'yajl-tools', 'pkgver': '2.1.0-3ubuntu0.20.04.1'},
{'osver': '22.04', 'pkgname': 'libyajl-dev', 'pkgver': '2.1.0-3ubuntu0.22.04.1'},
{'osver': '22.04', 'pkgname': 'libyajl2', 'pkgver': '2.1.0-3ubuntu0.22.04.1'},
{'osver': '22.04', 'pkgname': 'yajl-tools', 'pkgver': '2.1.0-3ubuntu0.22.04.1'},
{'osver': '23.04', 'pkgname': 'libyajl-dev', 'pkgver': '2.1.0-3ubuntu0.23.04.1'},
{'osver': '23.04', 'pkgname': 'libyajl2', 'pkgver': '2.1.0-3ubuntu0.23.04.1'},
{'osver': '23.04', 'pkgname': 'yajl-tools', 'pkgver': '2.1.0-3ubuntu0.23.04.1'}
];
var flag = 0;
foreach package_array ( pkgs ) {
var osver = NULL;
var pkgname = NULL;
var pkgver = NULL;
if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
if (osver && pkgname && pkgver) {
if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
}
}
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : ubuntu_report_get()
);
exit(0);
}
else
{
var tested = ubuntu_pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libyajl-dev / libyajl2 / yajl-tools');
}
Vendor | Product | Version | CPE |
---|---|---|---|
canonical | ubuntu_linux | 20.04 | cpe:/o:canonical:ubuntu_linux:20.04:-:lts |
canonical | ubuntu_linux | 22.04 | cpe:/o:canonical:ubuntu_linux:22.04:-:lts |
canonical | ubuntu_linux | 23.04 | cpe:/o:canonical:ubuntu_linux:23.04 |
canonical | ubuntu_linux | libyajl-dev | p-cpe:/a:canonical:ubuntu_linux:libyajl-dev |
canonical | ubuntu_linux | libyajl2 | p-cpe:/a:canonical:ubuntu_linux:libyajl2 |
canonical | ubuntu_linux | yajl-tools | p-cpe:/a:canonical:ubuntu_linux:yajl-tools |