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Executive Summary
In the ever-evolving landscape of cybersecurity threats, the recent discovery of CVE-2024-38094, a high-severity remote code execution vulnerability in Microsoft SharePoint, has raised significant concerns. This vulnerability, which stems from the deserialization of untrusted data, allows malicious actors to execute arbitrary code on affected SharePoint servers. The availability of a proof-of-concept (PoC) exploit on GitHub has further heightened the urgency for organizations to address this threat. This report delves into the technical intricacies of the vulnerability, its potential exploitation in the wild, and the necessary steps for mitigation.
Technical Information
CVE-2024-38094 is a critical vulnerability affecting several versions of Microsoft SharePoint, including the SharePoint Server Subscription Edition, SharePoint Server 2016, and SharePoint Server 2019. With a CVSS score of 7.2, this vulnerability is classified as high severity. The core issue lies in the deserialization of untrusted data, a common weakness enumerated as CWE-502. This flaw allows attackers to craft malicious payloads that, when deserialized by the SharePoint server, can lead to the execution of arbitrary code. The attack vector is network-based, requiring low attack complexity and high privileges, but no user interaction is needed, making it a potent threat.
The vulnerability's technical vector is described as CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, indicating its potential to compromise confidentiality, integrity, and availability. The PoC exploit, developed by the GitHub user "testanull," demonstrates the vulnerability's exploitation using Python scripts. This PoC is publicly accessible, increasing the risk of exploitation by threat actors.
Exploitation in the Wild
While there are no confirmed reports of active exploitation in the wild, the public availability of the PoC on GitHub suggests a significant risk. Threat actors could potentially leverage this PoC to target vulnerable SharePoint servers, especially in sectors where SharePoint is widely used for collaboration and document management. Organizations should be on high alert and monitor their systems for any indicators of compromise (IOCs) related to this vulnerability.
APT Groups using this vulnerability
As of now, there are no specific reports of Advanced Persistent Threat (APT) groups actively exploiting CVE-2024-38094. However, given the nature of the vulnerability and its potential impact, it is plausible that APT groups with a focus on targeting enterprise collaboration platforms could incorporate this exploit into their arsenal. Organizations in sectors such as finance, healthcare, and government, which are frequent targets of APT groups, should exercise heightened vigilance.
Affected Product Versions
The vulnerability affects the following versions of Microsoft SharePoint: SharePoint Server Subscription Edition, SharePoint Server 2016, and SharePoint Server 2019. Organizations using these versions are at risk and should prioritize patching and mitigation efforts.
Workaround and Mitigation
To mitigate the risk posed by CVE-2024-38094, Microsoft has released patches for the affected SharePoint versions. Organizations are strongly advised to apply these patches immediately to secure their systems. In scenarios where patching is not immediately feasible, alternative measures such as network segmentation and enhanced monitoring of SharePoint server activity should be implemented. Additionally, organizations should review their deserialization processes and ensure that only trusted data is processed.
References
For further information and technical details, please refer to the following resources: the Microsoft Security Response Center Advisory, the National Vulnerability Database Entry, and the GitHub PoC Repository.
Rescana is here for you
At Rescana, we understand the complexities and challenges posed by emerging cybersecurity threats. Our Continuous Threat and Exposure Management (CTEM) platform is designed to help organizations proactively identify and mitigate vulnerabilities, ensuring robust defense mechanisms are in place. Should you have any questions regarding this report or require assistance with your cybersecurity strategy, please do not hesitate to contact us at ops@rescana.com. We are here to support you in safeguarding your digital assets.
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