The version of OpenSSL installed on the remote host is prior to 1.1.1y. It is, therefore, affected by multiple vulnerabilities as referenced in the 1.1.1y advisory.
Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 sessions Impact summary: An attacker may exploit certain server configurations to trigger unbounded memory growth that would lead to a Denial of Service This problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is being used (but not if early_data support is also configured and the default anti-replay protection is in use). In this case, under certain conditions, the session cache can get into an incorrect state and it will fail to flush properly as it fills. The session cache will continue to grow in an unbounded manner. A malicious client could deliberately create the scenario for this failure to force a Denial of Service. It may also happen by accident in normal operation. This issue only affects TLS servers supporting TLSv1.3. It does not affect TLS clients. The FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL 1.0.2 is also not affected by this issue.
(CVE-2024-2511)
Issue summary: Calling the OpenSSL API function SSL_free_buffers may cause memory to be accessed that was previously freed in some situations Impact summary: A use after free can have a range of potential consequences such as the corruption of valid data, crashes or execution of arbitrary code. However, only applications that directly call the SSL_free_buffers function are affected by this issue. Applications that do not call this function are not vulnerable. Our investigations indicate that this function is rarely used by applications. The SSL_free_buffers function is used to free the internal OpenSSL buffer used when processing an incoming record from the network. The call is only expected to succeed if the buffer is not currently in use. However, two scenarios have been identified where the buffer is freed even when still in use. The first scenario occurs where a record header has been received from the network and processed by OpenSSL, but the full record body has not yet arrived. In this case calling SSL_free_buffers will succeed even though a record has only been partially processed and the buffer is still in use. The second scenario occurs where a full record containing application data has been received and processed by OpenSSL but the application has only read part of this data. Again a call to SSL_free_buffers will succeed even though the buffer is still in use. While these scenarios could occur accidentally during normal operation a malicious attacker could attempt to engineer a stituation where this occurs. We are not aware of this issue being actively exploited. The FIPS modules in 3.3, 3.2, 3.1 and 3.0 are not affected by this issue. Found by William Ahern (Akamai). Fix developed by Matt Caswell. Fix developed by Watson Ladd (Akamai). Fixed in OpenSSL 3.3.1 (Affected since 3.3.0). (CVE-2024-4741)
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.
##
include('compat.inc');
if (description)
{
script_id(192965);
script_version("1.3");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/07");
script_cve_id("CVE-2024-2511", "CVE-2024-4741");
script_xref(name:"IAVA", value:"2024-A-0208-S");
script_name(english:"OpenSSL 1.1.1 < 1.1.1y Multiple Vulnerabilities");
script_set_attribute(attribute:"synopsis", value:
"The remote service is affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The version of OpenSSL installed on the remote host is prior to 1.1.1y. It is, therefore, affected by multiple
vulnerabilities as referenced in the 1.1.1y advisory.
- Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when
processing TLSv1.3 sessions Impact summary: An attacker may exploit certain server configurations to
trigger unbounded memory growth that would lead to a Denial of Service This problem can occur in TLSv1.3
if the non-default SSL_OP_NO_TICKET option is being used (but not if early_data support is also configured
and the default anti-replay protection is in use). In this case, under certain conditions, the session
cache can get into an incorrect state and it will fail to flush properly as it fills. The session cache
will continue to grow in an unbounded manner. A malicious client could deliberately create the scenario
for this failure to force a Denial of Service. It may also happen by accident in normal operation. This
issue only affects TLS servers supporting TLSv1.3. It does not affect TLS clients. The FIPS modules in
3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL 1.0.2 is also not affected by this issue.
(CVE-2024-2511)
- Issue summary: Calling the OpenSSL API function SSL_free_buffers may cause memory to be accessed that was
previously freed in some situations Impact summary: A use after free can have a range of potential
consequences such as the corruption of valid data, crashes or execution of arbitrary code. However, only
applications that directly call the SSL_free_buffers function are affected by this issue. Applications
that do not call this function are not vulnerable. Our investigations indicate that this function is
rarely used by applications. The SSL_free_buffers function is used to free the internal OpenSSL buffer
used when processing an incoming record from the network. The call is only expected to succeed if the
buffer is not currently in use. However, two scenarios have been identified where the buffer is freed even
when still in use. The first scenario occurs where a record header has been received from the network and
processed by OpenSSL, but the full record body has not yet arrived. In this case calling SSL_free_buffers
will succeed even though a record has only been partially processed and the buffer is still in use. The
second scenario occurs where a full record containing application data has been received and processed by
OpenSSL but the application has only read part of this data. Again a call to SSL_free_buffers will succeed
even though the buffer is still in use. While these scenarios could occur accidentally during normal
operation a malicious attacker could attempt to engineer a stituation where this occurs. We are not aware
of this issue being actively exploited. The FIPS modules in 3.3, 3.2, 3.1 and 3.0 are not affected by this
issue. Found by William Ahern (Akamai). Fix developed by Matt Caswell. Fix developed by Watson Ladd
(Akamai). Fixed in OpenSSL 3.3.1 (Affected since 3.3.0). (CVE-2024-4741)
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://www.cve.org/CVERecord?id=CVE-2024-2511");
script_set_attribute(attribute:"see_also", value:"https://www.cve.org/CVERecord?id=CVE-2024-4741");
script_set_attribute(attribute:"solution", value:
"Upgrade to OpenSSL version 1.1.1y or later.");
script_set_attribute(attribute:"agent", value:"all");
script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:N/I:N/A:C");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-2511");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2024/04/08");
script_set_attribute(attribute:"patch_publication_date", value:"2024/04/08");
script_set_attribute(attribute:"plugin_publication_date", value:"2024/04/08");
script_set_attribute(attribute:"plugin_type", value:"combined");
script_set_attribute(attribute:"cpe", value:"cpe:/a:openssl:openssl");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_set_attribute(attribute:"stig_severity", value:"I");
script_set_attribute(attribute:"thorough_tests", value:"true");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Web Servers");
script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("openssl_version.nasl", "openssl_nix_installed.nbin", "openssl_win_installed.nbin");
script_require_keys("installed_sw/OpenSSL");
exit(0);
}
include('vcf.inc');
include('vcf_extras_openssl.inc');
var app_info = vcf::combined_get_app_info(app:'OpenSSL');
vcf::check_all_backporting(app_info:app_info);
var constraints = [
{ 'min_version' : '1.1.1', 'fixed_version' : '1.1.1y' }
];
vcf::openssl::check_version_and_report(
app_info:app_info,
constraints:constraints,
severity:SECURITY_WARNING
);