![]() This is a transformative milestone for Splunk as we join forces with a longtime trusted partner and create one of the largest software companies globally. Outbound LDAP traffic should not be allowed outbound through your perimeter firewall.#SplunkNews: We’re excited to announce that Splunk has entered into a definitive agreement to be acquired by Cisco in an all-cash transaction at approximately $30 billion in enterprise value. Malicious actors often abuse misconfigured LDAP servers or applications that use the LDAP servers in organizations. Note that adversaries can easily decide to use arbitrary ports for these protocols and potentially bypass this detection. This behavior could represent successful exploitation. The following analytic identifies the Java process of reaching out to default ports used by the LDAP and RMI protocols. This is required as part of the JNDI lookup as well as for retrieving the second stage. Outbound Network Connection from Java Using Default PortsĪ required step while exploiting the CVE-2021-44228 Log4j vulnerability is that the victim server will perform outbound connections to the attacker-controlled infrastructure. This will reduce the number of false positives and potentially identify successfully exploited servers. This detection correlates the previous analytic with outbound network connections coming from the same host. Log4Shell JNDI Payload Injection with Outbound Connection When executed against vulnerable web applications, the invocation can be seen in various parts of weblogs. In this case the payload string can be obfuscated in many different ways to bypass signature-based detection or prevention controls like IDS, IPS, and WAF products. Using the CIM Web data model can be even more beneficial for defenders.Īs with many attack sequences, obfuscation can be a powerful tool. The data sources that can be leveraged for this detection opportunity include web server logs, web and proxy logs, and API gateway logs. In their simplest forms, these unusual injection strings can be easily identified by looking for special strings. In the first step of the attack, adversaries submit malicious payloads to attempt exploitation. This section also describes the challenges that affect each of these detection opportunities. In particular, the payload injection and outbound connection stages will have specific patterns which defenders can utilize to identify the initial stages of exploitation. The Log4Shell exploitation path creates two unique detection opportunities before the defender must resort to more standard cybersecurity approaches. A dashboard is also included to help threat hunters identify signs of payload injection in their environments (even obfuscated). Using the data collected, we developed 13 new detections and 9 playbooks to help Splunk SOAR customers investigate and respond to this threat. We recorded a short demo setting up the Splunk Attack Range to simulate the attack. At the time of writing, there are two publicly known CVEs ( CVE-2021-44228, and CVE-2021-45046) the Splunk Security Content below is designed to cover exploitation attempts across both CVEs, including the recently released bypass technique. ![]() One week after its initial release, we are still learning new developments for the Log4j vulnerabilities. This post shares detection opportunities STRT found in different stages of successful Log4Shell exploitation. ![]() Like most cybersecurity teams, the Splunk Threat Research Team (STRT) has been heads-down attempting to understand, simulate, and detect the Log4j attack vector. F or more information on how to respond to the Log4j vulnerabilities using Splunk products, please see our Log4Shell response overview page.
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