LoadMaster Vulnerabilities

This is the HTTP/2 CONTINUATION flood vulnerability. LoadMaster doesn't use any of the vulnerable software listed in the CVEs in the security announcement. It is currently under evaluation whether or not LoadMaster is directly vulnerable to this exploit.

Not Vulnerable. LoadMaster doesn't support the 'runc' Linux container CLI tool.

7.2.59.4
7.2.54.10
7.2.48.12

Vulnerable. Using a specially crafted API call, unauthorized users can gain privileged access to LoadMaster and then use that access to reverse engineer passwords. Please see this knowledgebase article for more information.

Not Vulnerable. LoadMaster doesn't support the XZ Utils data compression library.

Vulnerable only when operating in non-FIPS mode. Unbounded memory growth is partially mitigated by the automatic restarting of system processes. This low severity exploit will be closed in a future release. 

7.2.59.3
7.2.54.9
7.2.48.11
7.1.35.11

Vulnerable. It is possible for a malicious actor, who has prior knowledge of the IP or hostname of a specific LM, to direct a currently logged-in administrative user to another third-party site. In such a scenario, the admin user can send HTTP requests to the UI to execute actions on LoadMaster. This vulnerability has been closed by enhancing the validation performed when CSRF checks are performed. Please see this knowledgebase article for more information.

7.2.59.3
7.2.54.9
7.2.48.11
7.1.35.11

Vulnerable. A logged-in UI user with any permission settings may be able to inject commands into the UI using a shell command that will execute the command in the context of that page and only for that user. This vulnerability has been closed by enhancing the validation performed by the UI. Please see this knowledgebase article for more information.

7.2.59.2
7.2.54.8
7.2.48.10

Vulnerable. Unauthenticated, remote attackers who have access to the network and port on which API access is configured can issue a carefully crafted API command that will allow arbitrary system commands to be executed without authentication. This critical security issue can be closed by installing one of the patches listed at left. For more information, please see this knowledgebase article.

Not Vulnerable. The vulnerable library is not present on LoadMaster. Any applications running on real servers behind LoadMaster that employ this library should be patched using a vendor-supplied update to close this vulnerability.

Limited Vulnerability. This issue with the PKCS12 (PFX) certificate file format affects all versions of OpenSSL used in the non-FIPS system in current and previous releases -- with the exception of the OpenSSL 3 FIPS module introduced in LMOS 7.2.54.7.

The vulnerability exposure on LoadMaster is limited to the action of adding or updating a TLS certificate in the PKCS12 format that was obtained from an untrusted source. In this case, a certificate from an untrusted source could contain NULL arguments that could lead to a process crash; this in turn could be leveraged to mount a denial of service attack.

LoadMaster is not vulnerable to this issue during other certificate operations, because certificates are not stored on LoadMaster in PKCS12 format.

OpenSSL has not yet made available a release that addresses this issue, as it is viewed as a low severity exploit. Once OpenSSL makes such releases available, we will schedule an update for future LoadMaster GA and LTSF releases.

Not Vulnerable. This vulnerability requires shell access to the ssh client, which is not provided on LoadMaster. SSH login only provides a restricted menu-based interface which cannot be leveraged to exploit this vulnerability.

Not Vulnerable. This vulnerability requires shell access to the ssh client, which is not provided on LoadMaster. SSH login only provides a restricted menu-based interface which cannot be leveraged to exploit this vulnerability. Exploiting this vulnerability also requires use of the ‘ProxyCommand’ configuration variable, which is not supported.

Not Vulnerable. The OpenSSH configuration on LoadMaster does not permit negotiation of the ciphers that allow this vulnerability (a.k.a. the Terrapin attack) to be exploited:

• ChaCha20-Poly1305

• all aes[128|192|256]-cbc ciphers

Although LoadMaster itself is not vulnerable, if you are using LoadMaster to load balance SSH connections to back-end real servers, then it's imperative that you either update your backend real servers to a release of OpenSSH that includes a fix for this issue, or you should ensure that the real server SSH configuration will not permit connections to be negotiated using the ciphers noted above. A vulnerability scanner that can be used to determine if a server is vulnerable to this attack can be downloaded here.

Theoretically Vulnerable. This is a weakness in the HTTP/2 protocol itself. It is mitigated on LoadMaster by the low HTTP/2 concurrency value used in the implementation and by the fact that HTTP/2 is supported only on the Client side of the connection. Also, in HTTP/2 Pass-Through mode, LoadMaster simply passes on the HTTP/2 traffic to the real server, and so isn't directly vulnerable to this exploit; of course, the real servers behind LoadMaster remain vulnerable in this scenario.   

Whether an ADC is used or not, it’s vital that customers implement mitigations directly on HTTP/2 servers to protect against this DoS exploit. A detailed explanation of how this vulnerability is exploited and can be mitigated can be found here.

Not Vulnerable. This exploit depends upon a vulnerability in ssh-agent, which is not supported on LoadMaster.

Not Vulnerable. These vulnerabilities are specific to the Siemens RUGGEDCOM ROX product and are not present on LoadMaster.

Not Vulnerable. Ghostscript is a third party application that is not supported on LoadMaster, which is not vulnerable to this exploit.

CVE-2023-32254

Not Vulnerable. LoadMaster doesn’t support the in-kernel SMB server capability required to exploit this vulnerability.

CVE-2023-32233

Not Vulnerable. Exploitation of this vulnerability requires an elevated level of privilege that is not available on LoadMaster via the UI or a remote shell. Linux servers located behind LoadMaster remain vulnerable and there is no mitigation for this exploit that can be configured on LoadMaster. All Linux real servers should be updated with a vendor fix for the Linux kernel. 

CVE-2023-29130

CVE-2023-28708

Not Vulnerable. LoadMaster doesn’t use Tomcat, so the LoadMaster itself isn’t vulnerable to this exploit.

Applications running behind LoadMaster that use Tomcat are vulnerable and should be updated with a fixed version of Tomcat. In the meantime, LoadMaster customers can take action to close this vulnerability by adding the Secure attribute to cookies coming from back-end Tomcat real servers using LoadMaster’s content rules as described here.

CVE-2023-28531

Not Vulnerable. This issue affects OpenSSH versions 8.9 through 9.3. LMOS versions above 7.2.53 use OpenSSH_8.4p1.

CVE-2023-28252

Not Vulnerable. This vulnerability is specific to the Windows Common Log File System, which is not supported by LoadMaster. Affected Windows servers behind LoadMaster should be updated with the latest patches from Microsoft.

Not Vulnerable. The base LMOS system doesn't include Python and so is not vulnerable.

If the Python2.7 add-on package is installed, the vulnerability cannot be exploited since LoadMaster does not implement block lists in Python. 

CVE-2023-22809

Not Vulnerable. LoadMaster is a closed appliance and does not provide a general purpose login or CLI that would allow the user to execute the 'sudo -e' command.

CVE-2023-22374

Not Vulnerable. This exploit leverages a defect in iControl SOAP, an open communications API, specifically on Big-IP systems from F5 Networks. LoadMaster does not use or support iControl SOAP. 

CVE-2023-20900

Not Vulnerable. This is a privilege escalation vulnerability present in the SAML implementation in versions of VMtools below 12.3.0. The Vmtoolsd add-on package on LoadMaster doesn't support SAML authentication and so is not vulnerable to this exploit.

Not Vulnerable. The version of glibc used on LoadMaster is not vulnerable to this exploit.

Not Vulnerable. These denial of service and sensitive information disclosure vulnerabilities exist only on Citrix Netscaler products and are unrelated to LoadMaster. See this Citrix security bulletin.

Not Vulnerable. The LoadMaster product doesn't use or include the libwebp library.

Not Vulnerable. This exploit is specific to Adobe InCopy, which is not supported on LoadMaster.

Not Vulnerable. These arbitrary code execution, cross-site scripting, and privilege elevation vulnerabilities exist only on Citrix Netscaler products and are unrelated to LoadMaster.

Theoretically Vulnerable. For OpenSSL versions on LoadMaster, this vulnerability is considered low severity, and affects only the display of objects such as X.509 certificates. This can only be done via the UI and API by an already authenticated user and so is considered unlikely to cause a Denial of Service. 

Not Vulnerable. The version of the kernel used by LoadMaster is not vulnerable to this exploit related to the RPL protocol (routing protocol for low power / lossy networks).

Not Vulnerable. This vulnerability applies to OpenSSL 3.0.0-3.0.7 only, which is not supported on LoadMaster.

Not Vulnerable. LoadMaster does not use any code that sets the X509_V_FLAG_CRL_CHECK flag and does not use its own network based CRL facility.

CVE-2023-0217

Not Vulnerable. This vulnerability applies to OpenSSL 3.0.0-3.0.7 only, which is not supported on LoadMaster. LoadMaster also does not use the EVP_PKEY_public_check() function required to exploit this vulnerability.

CVE-2023-0216

Not Vulnerable. This vulnerability applies to OpenSSL 3.0.0-3.0.7 only, which is not supported on LoadMaster. LoadMaster also does not use the PKCS7 functions required to exploit this vulnerability.

CVE-2023-0215

Not Vulnerable. LoadMaster does not use the API as required to expose this vulnerability.

CVE-2022-47938
CVE-2022-47939
CVE-2022-47940
CVE-2022-47941
CVE-2022-47942
ZDI-22-1681
ZDI-22-1687
ZDI-22-1688
ZDI-22-1689
ZDI-22-1690

Not Vulnerable. LoadMaster does not support the ksmbd binary and so is not vulnerable to this exploit. [Note that Linux servers configured behind LoadMaster remain vulnerable to this exploit and should be updated with the latest Linux kernel patch if they are running a vulnerable kernel release.]

CVE-2022-25636

Not Vulnerable. This exploit is present in Linux kernel versions 5.4 through 5.6.10, which are not supported on LoadMaster.

CVE-2022-41040 CVE-2022-41082

Not Vulnerable. LoadMaster itself is not vulnerable to these exploits; they are zero day vulnerabilities in Microsoft Exchange 2013, 2016, and 2019. There are, however, steps you can take on LoadMaster to protect your Exchange deployment from them. Please see this knowledge base article for more information. 

Not Vulnerable. While LoadMaster includes an affected version of curl in the delivered system, the curl command cannot be executed by users and cannot save data to local files.

Not Vulnerable. LoadMaster does not use any components of the Java Spring Framework. [This is also true of the Kemp 360 Central and Vision products.]

Partially Vulnerable. This vulnerability exploits a flaw in the Microsoft Windows Server implementation of HTTP trailer headers which may appear at the end of chunked messages. Because trailer headers are not supported on LoadMaster, non-passthrough Layer 7 services on LoadMaster are not susceptible to exploitation of this vulnerability. For passthrough services, the required remediation is to install the latest updates from Microsoft on all vulnerable servers, or turn off trailer header processing on those servers.  

Not Vulnerable. This is a vulnerability in the Oracle Java SE. A successful exploit of this vulnerability can result in unauthorized creation, deletion, or modification of Java SE accessible data. The Oracle Java SE is not present on LoadMaster, which is therefore not vulnerable to this attack. 

Not Vulnerable. This vulnerability is specific to custom, closed-source SSH libraries produced by Cisco for specific Cisco product lines as specified in the CVE.   

CVE-2022-4450

Partially Vulnerable. This exploit could be leveraged only by an already authenticated administrator who could install specially crafted PEM files on LoadMaster, which could in turn cause some system processes to exit abnormally.

CVE-2022-4304

Theoretically Vulnerable. An attacker would need to be able to capture traffic between LM and both the client and real server to get a complete dialogue; and then be able to replay a large number of similar dialogues to recover the plaintext used in a TLS session. By the time this is done, the TLS session is not likely to exist.

CVE-2022-3786
CVE-2022-3602

Not Vulnerable. These CVEs describe two high-severity vulnerabilities in OpenSSL version 3.0.6. LoadMaster does not yet support OpenSSL 3 -- running version 1.1.1n as of the date that these vulnerabilities were announced -- and so is not vulnerable to these exploits. Also see this security announcement.

Not Vulnerable. LMOS does include an affected OpenSSL release (1.1.1 thru 1.1.n), but the c_rehash script, on which these exploits depend, is not used by LoadMaster.

Not Vulnerable. This exploit affects specific versions of the Linux kernel only and LMOS does not use any of the vulnerable kernel versions. 

LoadMaster is vulnerable to this exploit. The updates listed at left were released on 25 April 2022 to close this vulnerability by upgrading to the OpenSSL release where this issue is addressed (OpenSSL 1.1.1n). Please see this section for upgrade guidance.

CVE-2021-45080

It was possible for a malicious, already authenticated, privileged user to obtain unrestricted access to the VLM disk image and thereby obtain a debug password to the running system. This vulnerability has been closed.

CVE-2021-44228

Not Vulnerable. The LoadMaster and GEO products are not vulnerable to this exploit, as Java is not used by either product. [Please note that the KEMP 360 Central and Kemp 360 Vision products also do not use Java.]

CVE-2021-41823

LoadMaster is vulnerable to this medium-level exploit. Customers can add a custom rule to the WAF engine to block it. Please see this article.

Not Vulnerable. This exploit depends on two optional configuration options being set on the target device, neither of which can be enabled on LoadMaster.

CVE-2021-41069

Validation has been enhanced for the upload of a Virtual Service Template to the system to close a security vulnerability wherein a carefully constructed file can be uploaded as a template and create unwanted files on the filesystem.

CVE-2021-36368

An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension, then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration).

In LMOS 7.2.55, OpenSSL is updated to version 1.1.1k which addresses this issue. Also see this support article.

Also note that in LMOS 7.2.55, the default setting for SSL Renegotiation is now disabled.

CVE-2020-15778

Theoretically Vulnerable.

CVE-2019-1549

CVE-2018-15919

Not Vulnerable. This issue affects OpenSSH versions 7.8 and below. LMOS versions above 7.2.53 use OpenSSH_8.4p1.

CVE-2016-20012

Not Vulnerable. This applies specifically to SSL protocol 3.0, as used in OpenSSL through 1.0.1i and other products. All currently supported versions of LMOS run with versions of OpenSSL that contain a fix for this issue.

Vulnerable. This is a known issue of the IPMI protocol and affects hardware appliances from many vendors. The advice from the IPMI/BMC vendor is to locate the BMC IP address on a secure, internal network that is accessible by trusted personnel only and to use strong passwords on all BMC user logins. It is also possible to disable login to the BMC so that IPMI cannot be used to send commands to the BMC, closing this vulnerability. Please see this article for more information.

Not Vulnerable. This issue applies only to specific hardware listed in the advisory and doesn’t affect LoadMaster.

Vulnerable. This is a vulnerability in HTTP compression that isn’t specific to LoadMaster, as documented here. Vulnerable websites typically serve dynamic web pages that also carry secret tokens that can be guessed by an attacker over repeated accesses. Best practices include, in order of effectiveness: disabling compression entirely, enabling compression only for static webpages, configuring rate limits for compressed web pages that contain secret data, and continuous log monitoring for repeated failed accesses (indicating possible attempts by attackers to guess secrets). 

Not Vulnerable. This exploit applies to the "SSL protocol, as used in certain configurations in Microsoft Windows and Microsoft Internet Explorer, Mozilla Firefox, Google Chrome, Opera, and other products…". This doesn’t apply to LoadMaster.

By default, LoadMaster is not vulnerable to this exploit since renegotiation is disabled by default in 7.2.55 and above (as you noted below). With renegotiation on, LoadMaster is no more vulnerable than any other network appliance running OpenSSL 1.1.1. This CVE is listed as disputed, per this note: It can also be argued that it is the responsibility of server deployments, not a security library, to prevent or limit renegotiation when it is inappropriate within a specific environment. Therefore, if you enable renegotiation on LM, you need to configure your back-end servers properly to limit renegotiation.

Not Vulnerable. This exploit affects the Linux kernel version 2.x.x release series; LoadMaster currently (LMOS 7.2.57) runs with the 4.14.137 kernel.

Please see this knowledge base article for a detailed explanation of LoadMaster and IP forwarding.