High

Remote Code Execution in Microsoft SharePoint Server via Deserialization

IdentifiersCVE-2024-38023CWE-502· Deserialization of Untrusted Data

CVE-2024-38023 is a remote code execution vulnerability in Microsoft SharePoint Server. A remote authenticated attacker with SharePoint permissions at the Site Owner level or higher can exploit the flaw by uploading a specially crafted file and then issuing a specially crafted API request that causes deserialization of parameters from that file. Successful exploitation results in execution of attacker-controlled code in the context of the SharePoint server. The available information indicates the vulnerable condition is tied to unsafe deserialization during SharePoint server-side processing of attacker-supplied file parameters.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows arbitrary code execution on the SharePoint server in the security context of the vulnerable SharePoint application environment. This can enable full compromise of the affected SharePoint instance, including execution of malicious server-side logic, access to hosted SharePoint content and application data available to that context, and potential follow-on actions such as persistence or lateral movement depending on the server's privileges and surrounding environment.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure by limiting SharePoint Site Owner and higher-privileged roles to only trusted administrators and users, restricting the ability to upload untrusted files where operationally feasible, and limiting access to the affected SharePoint APIs and administrative functionality through network segmentation and access controls. Increased monitoring of SharePoint file uploads and subsequent API activity may help detect exploitation attempts, but no complete mitigation short of vendor remediation is currently available from the provided information.

Remediation

Patch, then assume compromise.

Apply Microsoft's July 2024 security updates for Microsoft SharePoint Server that address CVE-2024-38023. Priority should be given to vulnerable SharePoint deployments where users with Site Owner or higher privileges exist and can upload content and invoke the affected API functionality.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Microsoft CorporationSharepoint Serverapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app

csirt skNews

Jul 11, 2024

Microsoft v rámci júlového Patch Tuesday opravil kritické a zero-day zraniteľnosti | CSIRT.SK

Remote code execution vulnerability in Microsoft SharePoint Server that allows an authenticated attacker with Site Owner or higher privileges to execute code via a crafted file upload and malicious API request leading to deserialization.

Jul 10, 2024

Microsoft Windows Hyper-V EoP bug under active exploit • The Register

Remote code execution vulnerability in Microsoft SharePoint Server requiring authenticated Site Owner permissions.

What this page doesn’t show

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity