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Date: 11/30/2023
The Citrix Bleed vulnerability, identified as CVE-2023-4966, allowing threat actors, notably LockBit ransomware affiliates, to exploit Citrix NetScaler ADC and Gateway appliances. The vulnerability allows attackers to bypass password requirements and multifactor authentication by acquiring access to valid cookies from sending HTTP GET requests with a crafted HTTP Host header, leading to a vulnerable appliance returning system memory information.
Exploitation of the Citrix Bleed vulnerability by LockBit ransomware affiliates and other threat actors results in the unauthorized hijacking of legitimate user sessions. Attackers can acquire elevated permissions, harvest credentials, and move laterally within the affected environments. The potential use of tools like PowerShell scripts and remote management solutions exacerbates the risk, emphasizing the significant impact on organizational security.
A fix was released by Citrix which should be applied immediately. Other recommendations include technical controls to limit post-exploitation activities such as application controls that prevent 3rd party remote access tools from running, restricting the use of PowerShell to specific users, and limiting the use of remote desktop on internal networks (e.g. jump hosts).
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Threat actors are actively targeting the education, government, and business services sectors using the NetSupport RAT, a remote access trojan. The NetSupport RAT is distributed through fraudulent updates, drive-by downloads, malware loaders like GHOSTPULSE, and various phishing campaigns. Despite being a legitimate remote administration tool, NetSupport Manager has been used by malicious actors to serve as a launching point for subsequent attacks.
Once installed, NetSupport RAT allows threat actors to monitor behavior, transfer files, manipulate computer settings, and move laterally within the network. The presence of remote access tools like NetSupport is often an early indicator of ransomware actors gaining a foothold in a victim environment.
End users should exercise caution while web browsing and avoid downloads from untrusted sources. All end user systems should be monitored and protected by Endpoint Detection & Response tools. It is also recommended that organizations conduct awareness training focused on these threat vectors. If possible, implement application controls to prevent the execution of unapproved applications such as NetSupport.
Sources
https://thehackernews.com/2023/11/netsupport-rat-infections-on-rise.html
On November 23, 2023, it was widely reported that automotive technology supplier Valeo filed a lawsuit against Nvidia for data theft. The story holds valuable lessons for readers of this threat intelligence feed. According to the lawsuit, during a videoconference, Nvidia employee Mohammad Moniruzzaman accidentally showed Intellectual Property (IP) belonging to Valeo on his screen. Moniruzzaman was employed by Nvidia after working for Valeo developing driving assistance software. The lawsuit states that after Moniruzzaman’s screensharing blunder, they performed a forensic audit and found that he had exfiltrated four software repositories including more 6 GB of source code by “granting unauthorized access of Valeo’s systems to his own personal email account”. According to The Register, Moniruzzaman was “convicted in Germany for unlawful acquisition, use and disclosure of Valeo’s trade secrets in September 2023”.
The alleged impact of this data theft is Valeo’s loss of hundreds of millions of dollars worth of intellectual property.
Ensure that your company is aware of the value of its intellectual property and protect it accordingly. Include the following in an information security program:
Moniruzzaman’s blunder after his data theft is a lesson to all who present on videoconferencing systems such as Microsoft Teams: Only share what you intend to share. Whenever possible, share the application window only instead of your entire screen. Also consider information that might be seen with your webcam.
Sources
https://www.theregister.com/2023/11/22/nvidia_sued_after_teams_meeting/
https://s3.documentcloud.org/documents/24174583/5_23-cv-05721.pdf
According to Bleeping Computer, the Lumma information stealing trojan claims to have the ability to use expired cookies to authenticate to Google services. The Lumma Malware-As-A-Service apparently uses restore files for this capability.
Unauthorized access to Google service may expose an organization to impacts including data theft or wire fraud.
Ensure that detective controls for cloud services alert on or stop activity from unexpected regions or potentially malicious IP addresses.
Sources
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