Monday, November 4, 2024
HomeCVE/vulnerabilityCitrix Bleed: PoC Released for Citrix NetScaler Zero-Day Vulnerability

Citrix Bleed: PoC Released for Citrix NetScaler Zero-Day Vulnerability

Published on

Malware protection

Two vulnerabilities were disclosed by Citrix, which were CVE-2023-4966 and CVE-2023-4967, with critical and high severities, respectively. Of these two, CVE-2023-4966 has been released with a publicly available PoC. This vulnerability is associated with a sensitive information disclosure score of 9.4 (Critical).

This vulnerability existed in the Citrix Netscaler ADC and Netscaler Gateway versions before their latest release. However, Citrix has fixed this vulnerability, and patches have been issued.

CVE-2023-4966 – Proof of Concept

For diving deep, the vulnerable devices were looked upon inside the /netscaler/nsppe, the Netscaler packet processing engine containing the complete TCP/IP network stack and multiple HTTP services.

- Advertisement - SIEM as a Service

Additionally, the Ghidra tool was used to decompile the nsppe, and BinExport to create a BinDiff file. Comparing the compiled BinDiff file of two vulnerable devices, there were more than 50 different functions.

Two functions, ns_aaa_oauth_send_openid_config and ns_aaa_oauthrp_send_openid_config, were found to perform the same function to implement the OpenID Connect Discovery endpoint. Both of these functions are accessible without authentication.

Exploitation

The vulnerability existed on the return value of snprintf, which determines the number of bytes to send for the ns_vpn_send_response. As part of exploitation, snprintf is supplied with an exceeded buffer size of 0x20000 bytes.

Furthermore, a complete Proof of Concept report has been published by AssetNote, providing detailed information on the exploitation methods, detailed steps, and others.

Affected Products

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

Users of these products are recommended to upgrade to the latest versions of these products to prevent these vulnerabilities from getting exploited.

Protect yourself from vulnerabilities using Patch Manager Plus to patch over 850 third-party applications quickly. Try a free trial to ensure 100% security.

Eswar
Eswar
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.

Latest articles

Evasive Panda Attacking Cloud Services To Steal Data Using New Toolkit

The Evasive Panda group deployed a new C# framework named CloudScout to target a...

Massive Midnight Blizzard Phishing Attack Using Weaponized RDP Files

Researchers warn of ongoing spear-phishing attacks by Russian threat actor Midnight Blizzard targeting individuals...

Sophisticated Phishing Attack Targeting Ukraine Military Sectors

The Ukrainian Cyber Emergency Response Team discovered a targeted phishing campaign launched by UAC-0215...

Chinese Hackers Attacking Microsoft Customers With Sophisticated Password Spray Attacks

Researchers have identified a network of compromised devices, CovertNetwork-1658, used by Chinese threat actors...

Free Webinar

Protect Websites & APIs from Malware Attack

Malware targeting customer-facing websites and API applications poses significant risks, including compliance violations, defacements, and even blacklisting.

Join us for an insightful webinar featuring Vivek Gopalan, VP of Products at Indusface, as he shares effective strategies for safeguarding websites and APIs against malware.

Discussion points

Scan DOM, internal links, and JavaScript libraries for hidden malware.
Detect website defacements in real time.
Protect your brand by monitoring for potential blacklisting.
Prevent malware from infiltrating your server and cloud infrastructure.

More like this

Evasive Panda Attacking Cloud Services To Steal Data Using New Toolkit

The Evasive Panda group deployed a new C# framework named CloudScout to target a...

Massive Midnight Blizzard Phishing Attack Using Weaponized RDP Files

Researchers warn of ongoing spear-phishing attacks by Russian threat actor Midnight Blizzard targeting individuals...

Sophisticated Phishing Attack Targeting Ukraine Military Sectors

The Ukrainian Cyber Emergency Response Team discovered a targeted phishing campaign launched by UAC-0215...