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Citrix is Warning Critical security flaws in NetScaler Application Delivery Controllers (ADCs) and gateways are being actively exploited by users in the real world, the company said.
tracked CVE-2023-3519 (CVSS score: 9.8), this issue is related to the following cases: code injection As a result, unauthorized remote code execution is possible. Affects the following versions:
- NetScaler ADC and NetScaler Gateway 13.1 before 13.1-49.13
- NetScaler ADC and NetScaler Gateway 13.0 before 13.0-91.13
- NetScaler ADC and NetScaler Gateway version 12.1 (now end of life)
- NetScaler ADC 13.1-FIPS prior to NetScaler ADC 13.1-37.159
- NetScaler ADC 12.1-FIPS prior to NetScaler ADC 12.1-55.297, and
- Before NetScaler ADC 12.1-NDcPP 12.1-55.297
The company did not provide further details about the flaws related to CVE-2023-3519, other than saying that it has seen exploitation of this flaw in “unmitigated appliances.” However, for an exploit to be successful, the device must be either a gateway (VPN virtual server, ICA proxy, CVPN, RDP proxy) or authentication and accounting (AAA) virtual server.
Alongside CVE-2023-3519, we are also addressing two other bugs.
- CVE-2023-3466 (CVSS Score: 8.3) – Improper input validation vulnerability allows reflected cross-site scripting (XSS) attacks.
- CVE-2023-3467 (CVSS Score: 8.0) – Improper privilege management vulnerability could lead to privilege escalation to root administrator (nsroot).
Wouter Rijkbost and Jorren Geurts of Resillion reported the bug. A patch has been released that addresses his three flaws in the version below.
- NetScaler ADC and NetScaler Gateway 13.1-49.13 and later releases
- NetScaler ADC and NetScaler Gateway 13.0-91.13 and 13.0 and later releases
- NetScaler ADC 13.1-FIPS 13.1-37.159 and later releases of 13.1-FIPS
- NetScaler ADC 12.1-FIPS 12.1-55.297 or later 12.1-FIPS releases, and
- NetScaler ADC 12.1-NDcPP 12.1-55.297 and later 12.1-NDcPP releases
NetScaler ADC and NetScaler Gateway version 12.1 customers are encouraged to upgrade their appliances to a supported version to mitigate potential threats.
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Last month, eSentire announced that “ nitrogen A compromised WordPress site is used to host a malicious ISO image file that, when launched, can connect to remote servers to retrieve additional payloads such as Python scripts and Cobalt Strike. A malicious DLL file is deployed.