What is CVE-2024-21893 vulnerability?
CVE-2024-21893 is a critical remote code execution (RCE) vulnerability found in certain versions of Ivanti's secure gateway software. It allows attackers to execute arbitrary code on a compromised system, often exploiting weaknesses in authentication processes. This vulnerability, caused by insufficient input validation, poses significant risks to enterprises relying on Ivanti solutions to safeguard data.
When was it discovered?
The CVE-2024-21893 vulnerability was publicly disclosed in January 2024 by security researchers after being reported initially in late 2023. Credit for the discovery goes to independent researchers collaborating with Ivanti. Ivanti promptly issued a security advisory and patch after the disclosure.
Affected products & versions
Product | Versions Affected | Fixed Versions / Patch Links |
Ivanti Connect Secure | 9.2R1 – 9.2R9 | Ivanti Patch Advisory |
Ivanti Policy Secure | 9.1R3 – 9.1R7.3 | Ivanti Patch Advisory |
CVE-2024-21893 technical description
The CVE-2024-21893 vulnerability stems from a lack of proper input validation in Ivanti’s authentication handling processes. Attackers can craft malicious HTTP requests that exploit these flaws, leading to arbitrary code execution. The root cause lies in poorly sanitized authentication tokens that allow remote attackers to bypass security controls and take full control of affected systems. Testing revealed that vulnerable code paths are specific to the user authentication mechanism, making unpatched systems particularly susceptible.
Tactics, Techniques & Procedures (TTPs)
Attackers leveraging CVE-2024-21893 typically utilize phishing emails to deliver exploits. Common tactics include injecting malicious payloads into authentication requests or leveraging compromised credentials to gain remote access.
Indicators of Compromise (IoCs)
Organizations should monitor for unusual authentication attempts, unexpected system log entries, and outbound connections to suspicious IPs. Specific IoCs include access to known malicious domains linked with exploitation campaigns and unauthorized administrative actions.
Known proof-of-concepts & exploits
Several proof-of-concept (PoC) exploits have been developed, some of which have been weaponized in active attack campaigns. Exploitation frameworks like Metasploit have incorporated CVE-2024-21893 modules, making it easier for attackers to weaponize this vulnerability.
How to detect CVE-2024-21893 vulnerability?
To detect CVE-2024-21893, organizations should utilize endpoint detection and response (EDR) solutions and SIEM platforms. Custom detection rules for monitoring authentication logs, such as detecting malformed tokens, can help identify attempts to exploit this vulnerability. Logging sources to query include HTTP request logs and user authentication logs.
Impact & risk of CVE-2024-21893 vulnerability
This vulnerability significantly impacts data confidentiality, integrity, and availability. Successful exploitation allows attackers to deploy ransomware, steal sensitive information, or disrupt services. Example misuse scenarios include unauthorized financial transactions and the exfiltration of intellectual property.
Mitigation & remediation strategies
Organizations should immediately apply the latest patches provided by Ivanti to affected products. For systems that cannot be patched, temporary mitigations include disabling vulnerable services, segmenting networks, and implementing strong access control policies. Regular security audits and monitoring IoCs are vital for ongoing protection.
CVE-2024-21893 Vulnerability FAQs
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