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Date: 10/25/2023
Citrix is warning administrators to secure NetScaler ADC and Gateway appliances immediately against ongoing attacks exploiting the CVE-2023-4966. The vulnerability is a critical sensitive information disclosure flaw that is remotely exploitable by unauthenticated attackers and it does not require user interaction.
The vulnerability allows threat actors to steal authentication sessions and hijack accounts, potentially bypassing multifactor authentication, which could lead to a network wide compromise. Attackers may deploy backdoors so that their access can persist even after patches are applied.
A patch is available and should be applied immediately if not already completed. If not, it is recommended that active and persistent sessions be terminated. Ensure that critical systems are monitored with Endpoint Detection & Response software and that suspicious activity originating from Citrix appliances is investigated immediately.
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Backdoors implanted on Cisco devices through the exploitation of zero-day flaws CVE-2023-20198 and CVE-2023-20273 are being modified by threat actors to evade current signature detections. The new implant version now checks for an Authorization HTTP header before responding.
Requiring an authorized HTTP header means that initial scan methods to detect the implant will be ineffective. Scan methods are likely to update quickly to include authorized HTTP headers. There are also curl commands that can be used to check for implants. Keep in mind that the exploitation of CVE-2023-20198 and CVE-2023-20273 can be used as a launching point for more severe network-wide attacks.
Ensure available patches and mitigation steps are applied. Once patched, ensure checks for implants are performed. Additionally, critical systems should be monitored with Endpoint Detection & Response software to efficiently respond to incidents early in the attack chain where impact will be minimized.
Sources
Okta shared some details about a recent breach in which attackers exfiltrated support files of Okta customers which contained sensitive data such as website session tokens. These tokens were replayed by attackers to impersonate victims.
The potential impact of this type of impersonation can lead to data exfiltration and compromise of other accounts.
Review the posting from Okta by clicking on this link https://sec.okta.com/harfiles and search your environment for the associated indicators of compromise. Ensure that authentication logs are being aggregated and regularly reviewed by competent security professionals.
Sources
One of the most frequent frustrations of incident response teams working on cloud breaches is the discovery that a particular category of log events is unavailable because of the victim’s licensing level. In the wake of a recent breach, Microsoft, under pressure from CISA, has expanded the logging included with their cloud offerings. In the recent expansions, Microsoft has increased the default retention time for logs, and added some events useful for incident responders and forensic experts.
This is a win for Microsoft cloud service customers. The additional log events will provide insight into cloud services operations that were not previously available.
Gain an understanding of what logging options exist for any service, Microsoft Cloud included. Like most organizations, sensitive information is exchanged via email. Ensure that logs exist so that you can defensibly report on attackers activities in the case of a breach. Although Software-As-A-Service (SAAS) offerings do have the benefit of outsourcing direct server and software maintenance logging and licensing are not “set-and-forget” configuration items. They require regular maintenance.
Sources
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Prior to joining GreyCastle Security, Ho led finance and administrative functions at multiple private equity and venture-backed portfolio companies across multiple industries. Ho holds a bachelor’s degree in Accounting from Pennsylvania State University in Centre County, Pennsylvania and a master’s degree in Business Administration from the Wharton School of Business at the University of Pennsylvania in Philadelphia, Pennsylvania.
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Prior to becoming CEO, Dan served as the company’s Chief Strategy Officer, during which he supported multiple acquisitions and helped the organization achieve substantial sales growth. In addition to serving as CEO at GreyCastle Security, Dan continues to hold the position of Chief Commercial Officer (CCO) at Assured information Security (AIS) in Rome, New York, a company he co-founded in 2001.
Over the course of the last 22 years, Dan has been committed to advancing the state of cybersecurity and has played an instrumental role in the identification and development of critical, next-generation cyber capabilities. He has held positions in almost every facet of cybersecurity, beginning as a computer forensic examiner and progressing through the management and executive leadership ranks. In addition to co-founding AIS, Dan has facilitated multiple cybersecurity startups, raised investment capital and has served in various lead and support roles toward the acquisition of five companies in the last eight years.
Dan has a bachelor’s degree in Cybersecurity and a master’s degree in Cybersecurity from Utica College in Utica, New York.
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In addition to various voice and data technology platforms, he possesses a strong background in leadership development, sales and marketing leadership, transformational leadership and strategic planning. Dan has a thirst for knowledge and as a committed lifelong learner, he encourages and supports professional development initiatives for his teams and continues his involvement with Vistage International.
Dan holds a bachelor’s degree in Biology from Lafayette College in Easton, Pennsylvania, where he was selected as a member of their Athletic Hall of Fame in 2016.
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Dan has been a cybersecurity practitioner for more than 20 years and uses his knowledge and experience to develop cybersecurity solutions that ensure readiness and preparedness.
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Prior to this role, Francesca was Director of People & Culture at GreyCastle and with her leadership, the company’s culture has been recognized by Inc. Magazine as a Nationally recognized Best Workplace, Albany Business Review Best Places to Work and Albany Times Union Top Workplaces.
Before joining GreyCastle Security, Francesca worked as an OD consultant and focused on strategic culture change at The Kaleel Jamison Consulting Group, Inc. for more than six years. There, she facilitated client education sessions, coached leaders and teams, developed and executed consulting interventions and served as strategy project leader on various client engagements. Her work has taken her into Fortune 100 companies and across borders including Panama, Singapore and beyond.
Francesca is a Lean Six Sigma–certified Green Belt, a proud YWCA-GCR board member and in 2013, she coordinated and emceed the inaugural TEDx Troy—a livestream of TEDCity 2.0. Since 2012, she has coordinated and emceed the Troy 100 Forum, a biannual forum for government, religious and community leaders to discuss issues vital to the future of Troy, New York.
Bilingual in English and Italian, Francesca holds a bachelor’s degree in Management and Technology from the Rensselaer Polytechnic Institute’s Lally School of Management & Technology. She was awarded Cybersecurity Recruiter of the year North America in 2017 by the Cybersecurity Excellence Awards.
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Prior to joining GreyCastle Security, Jamie has held leadership positions with Annese and Associates, ConvergeOne and BlueSky IT Partners with a focus on delivering cost effective information technology solutions for companies across multiple verticals.
Jamie holds a bachelor’s degree in Political Science from Le Moyne College in Syracuse, New York, a master’s degree in Business Administration from Gardner-Webb University in Boiling Springs, North Carolina and a master’s degree in Computer Information Systems from University of Phoenix in Phoenix, Arizona.
