Experts issued security alerts concerning the ongoing exploitation of Big-IP (CVE-2023-46747, CVE-2023-46748) and Citrix (CVE-2023-4966) vulnerabilities.
The publicly available Proof of Concepts (POCs) for these vulnerabilities were rapidly circulated in cybercrime forums.
Over 20,000 “Netscaler” instances and 1,000 “Big IP” instances are available online.
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These systems might be attractive targets for attackers and might be exposed to current security flaws, according to Cyble researchers.
Details of the BIG IP Vulnerabilities:
The vulnerability, identified as CVE-2023-46747, allows an attacker having network access to the BIG-IP system over the management port and/or self-IP addresses to execute arbitrary system instructions.
Undisclosed requests could bypass configuration utility authentication.
The next vulnerability is tracked as CVE-2023-46748 in the BIG-IP Configuration utility. It allows an authenticated attacker to execute arbitrary system commands if they have network access to the Configuration utility through the BIG-IP management port or self-IP addresses.
F5 BIG-IP Virtual Edition is linked to CVE-2023-46747 and CVE-2023-46748. F5 has identified threat actors as using the CVE-2023-46747 vulnerability to launch attacks that take advantage of CVE-2023-46748.
Praetorian Labs security professionals found these vulnerabilities and made the information public on October 26, 2023.
They discovered an authentication bypass flaw that had the ability to result in a full compromise of F5 systems with an exposed Traffic Management User Interface (TMUI).
BIG-IP Versions Known to be Vulnerable:
- 17.1.0
- 16.1.0 – 16.1.4
- 15.1.0 – 15.1.10
- 14.1.0 – 14.1.5
- 13.1.0 – 13.1.5
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Mitigation
To mitigate this issue, you can run the script provided in the F5 advisory for BIG-IP versions 14.1.0 and later.
Citrix Vulnerability
With a critical CVSS score of 9.4, CVE-2023-4966 is categorized as a “sensitive information disclosure” vulnerability. Its elevated score for an information disclosure vulnerability makes it noteworthy.
Researchers at Assetnote examined and documented the exploitation of CVE-2023-4966.
Vulnerable Software Version(s)
- NetScaler ADC and NetScaler Gateway 14.1 before 14.1-8.50
- NetScaler ADC and NetScaler Gateway 13.1 before 13.1-49.15
- NetScaler ADC and NetScaler Gateway 13.0 before 13.0-92.19
- NetScaler ADC 13.1-FIPS before 13.1-37.164
- NetScaler ADC 12.1-FIPS before 12.1-55.300
- NetScaler ADC 12.1-NDcPP before 12.1-55.300
Mitigation
Customers of NetScaler ADC and NetScaler Gateway are strongly encouraged by Citrix to install the appropriate upgraded versions of these products as soon as possible:
- NetScaler ADC and NetScaler Gateway 14.1-8.50 and later releases
- NetScaler ADC and NetScaler Gateway 13.1-49.15 and later releases of 13.1
- NetScaler ADC and NetScaler Gateway 13.0-92.19 and later releases of 13.0
- NetScaler ADC 13.1-FIPS 13.1-37.164 and later releases of 13.1-FIPS
- NetScaler ADC 12.1-FIPS 12.1-55.300 and later releases of 12.1-FIPS
- NetScaler ADC 12.1-NDcPP 12.1-55.300 and later releases of 12.1-NDcPP
Since attackers are currently targeting the vulnerabilities, it is recommended that mitigations be applied as soon as possible.
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