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critical advisory

Ollama Server Possible RCE via Malicious Model Loading

The detection identifies potential remote code execution attempts on Ollama servers through malicious model loading by monitoring error messages and failure patterns during model loading operations, which could indicate malicious model injection, path traversal attempts, or exploitation of model loading mechanisms, leading to arbitrary code execution on the server.

This brief addresses a critical vulnerability in Ollama servers that could lead to remote code execution (RCE). The threat involves attackers attempting to load malicious models onto the server to execute arbitrary code. This is achieved by exploiting vulnerabilities in the model loading process or by injecting specially crafted models designed to trigger server errors and allow code execution. The detection focuses on identifying unusual error patterns during model loading, such as crashes, failures related to "llama runner," and model-specific errors. This activity may originate from an external threat actor or a malicious insider attempting to compromise the Ollama server. Successful exploitation allows the attacker to gain full control of the server.

Attack Chain

  1. The attacker identifies an Ollama server with accessible model loading functionality.
  2. The attacker crafts a malicious model or exploits an existing model.
  3. The attacker initiates a model loading request to the Ollama server.
  4. The Ollama server attempts to load the model.
  5. The malicious model triggers an error within the llama runner component or the model processing logic.
  6. The error leads to a service crash or code execution due to vulnerabilities in the model loader.
  7. The attacker gains remote code execution on the Ollama server.

Impact

A successful attack can lead to complete compromise of the Ollama server. The attacker gains the ability to execute arbitrary code, potentially leading to data exfiltration, denial of service, or further lateral movement within the network. The risk is heightened due to the potential for sensitive data stored or processed by the Ollama server to be exposed or manipulated. The number of victims and specific sectors targeted are unknown, but the impact is potentially widespread given the increasing adoption of Ollama servers.

Recommendation

  • Deploy the Ollama Possible RCE via Model Loading Sigma rule to your SIEM to detect suspicious model loading errors on Ollama servers.
  • Review and harden the Ollama server configuration to restrict model loading permissions and validate model integrity.
  • Implement network segmentation to limit the impact of a compromised Ollama server.
  • Investigate any detected instances of model loading errors and potential RCE attempts based on the Sigma rule output.

Detection coverage 2

Ollama Possible RCE via Model Loading

critical

Detects Ollama server errors during model loading operations indicative of malicious model injection or path traversal attempts leading to potential remote code execution.

sigma tactics: initial_access techniques: T1190 sources: application, ollama

Ollama Service Crash Detection

high

Detects instances where the Ollama service crashes unexpectedly, potentially due to a malicious model or exploitation attempt.

sigma tactics: impact sources: application, ollama

Detection queries are available on the platform. Get full rules →