SSL/TLS: Renegotiation DoS Vulnerability

[Pajik3909]

Hello everybody,

I received information about the problem with renegotiation DoS Vulnerability from our IT department. See message below:

Hostname: qlikxxxxxx,
Host Ip: 
Taskname:

Severity: Low,
Description: SSL/TLS: Renegotiation DoS Vulnerability (CVE-2011-1473, CVE-2011-5094)
Summary: The remote SSL/TLS service is prone to a denial of service (DoS) vulnerability.
Insight: The flaw exists because the remote SSL/TLS service does not properly restrict client-initiated renegotiation within the SSL and TLS protocols. Note: The referenced CVEs are affecting OpenSSL and Mozilla Network Security Services (NSS) but both are in a DISPUTED state with the following rationale: > 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. Both CVEs are still kept in this VT as a reference to the origin of this flaw.
Solution: Users should contact their vendors for specific patch information. A general solution is to remove/disable renegotiation capabilities altogether from/in the affected SSL/TLS service.
Nvt: 1.3.6.1.4.1.25623.1.0.117761
CVE: CVE-2011-1473, CVE-2011-5094>
Affected: Every SSL/TLS service which does not properly restrict client-initiated renegotiation.
Detection: Checks if the remote service allows to re-do the same SSL/TLS handshake (Renegotiation) over an existing / already established SSL/TLS connection.
Descriptions: The following indicates that the remote SSL/TLS service is affected:Protocol Version | Successful re-done SSL/TLS handshakes (Renegotiation) over an existing / already established SSL/TLS connection----------------------------------------------------------------------------------------------------------------------------------TLSv1.2 | 10
Soulution Type: VendorFix,
Reference: CVE-2011-1473; CVE-2011-5094; https://mailarchive.ietf.org/arch/msg/tls/wdg46VE_jkYBbgJ5yE4P9nQ-8IU/; https://orchilles.com/ssl-renegotiation-dos/; https://vincent.bernat.ch/en/blog/2011-ssl-dos-mitigation; https://www.openwall.com/lists/oss-security/2011/07/08/2

Does exist any solution for solving this problem?

Thank you,

Pavel

[Chip_Matejowsky]

Hello @Pajik3909,

What version of QlikView are your running that is being flagged on a vulnerability report from 12 years ago? If you run the currently supported versions of QlikView: May 2023 (12.80) or May 2022 (12.70), is this vulnerability flagged?

Best Regards

[Pajik3909]

Hi,

We use these:

"Qlik Sense May 2021", version 14.20.5

"Qlik Sense Object Bundles", version 14.20.5

Best regards

Pavel

[Chip_Matejowsky]

Hi @Pajik3909,

Your first response refers to Qlik Sense versions, but your second response references QlikView. Is this issue for QlikView or for Qlik Sense? Both?

Best Regards

[Pajik3909]

Hi,

we have Qlik Sense Enterprise. First response refers to this.

best regards,

Pavel

[Chip_Matejowsky]

Thanks for confirming. You opened this thread in the QlikView > App Development forum so I will move it to the Qlik Sense > Deployment & Management forum so that it reaches its intended audience.

Regarding the versions you reported - May 2021, please note that this version reached end of life for support assistance o May 10, 2023. Refer to Qlik Support article Qlik Sense Enterprise on Windows Product Lifecycle for more details. Suggest that you upgrade the Qlik Sense Enterprise instance to a supported version, such as August 2023 and see if this vulnerability is flagged.

Best Regards

[Pajik3909]

Hello,

I will do update of  Qlik Sense Enterprise on Windows to version August 2023.

And we will see.

Thank you,

Pavel