Monday, December 4, 2023

CitrixBleed Flaw Widely Exploited, Primarily by a Ransomware Gang

At the end of October, AssetNote released a proof-of-concept for the CVE-2023–4966 associated with sensitive information disclosure for Citrix Netscaler ADC devices and was given a severity rating of 9.4 (Critical).

After the release of PoC, there seems to be a mass exploitation of this vulnerability by threat actors. However, the technical details of this vulnerability were already obtained by threat actors and are currently being exploited in the wild.

CVE-2023-4966: Sensitive Data Exposure in Citrix Netscaler ADC 

Threat actors can exploit this vulnerability to gain memory access to the affected devices. This memory also holds the session tokens, which allow the login bypass and all multi-factor authentications.

Moreover, once threat actors gain complete authentication over the device, they can perform various malicious actions.

Source: Double Pulsar
Source: Double Pulsar

Additional reports indicate that this vulnerability is being exploited by random people who are just owning anything to extract the session tokens. This report was extracted from GreyNoise Honeypots.

This security flaw is currently being exploited at a large scale, as per Kevin Beaumont’s observation. Previously, it was only utilized for targeted exploitation to gain access to a network and had not spread widely.

CVE IDAffected ProductsFixed in Version
CVE-2023-4966NetScaler ADC and NetScaler Gateway 14.1 before 14.1-8.50NetScaler ADC and NetScaler Gateway 14.1-8.50 and later releases
NetScaler ADC and NetScaler Gateway 13.1 before 13.1-49.15NetScaler ADC and NetScaler Gateway 13.1-49.15 and later releases of 13.1
NetScaler ADC and NetScaler Gateway 13.0 before 13.0-92.19NetScaler ADC and NetScaler Gateway 13.0-92.19 and later releases of 13.0
NetScaler ADC 13.1-FIPS before 13.1-37.164NetScaler ADC 13.1-FIPS 13.1-37.164 and later releases of 13.1-FIPS
NetScaler ADC 12.1-FIPS before 12.1-55.300NetScaler ADC 12.1-FIPS 12.1-55.300 and later releases of 12.1-FIPS
NetScaler ADC 12.1-NDcPP before 12.1-55.300NetScaler ADC 12.1-NDcPP 12.1-55.300 and later releases of 12.1-NDcPP

It is recommended for organizations to upgrade to the latest versions of Citrix Netscaler ADC to prevent this vulnerability from getting exploited.

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Eswar is a Cyber security content editor with a passion for creating captivating and informative content. With years of experience under his belt in Cyber Security, he is covering Cyber Security News, technology and other news.

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