Attacking PowerShell Clixml Deserialization
PowerShell's CLIXML deserialization presents security risks, including remote code execution. The article discusses vulnerabilities, gadget chains, and offers recommendations for IT operations and developers to mitigate these risks.
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The article discusses the security risks associated with PowerShell's CLIXML deserialization, which can lead to vulnerabilities such as remote code execution. It highlights that common PowerShell functionalities, including PowerShell Remoting and PowerShell Direct, depend on this deserialization process, making them susceptible to attacks. The author, Alexander Andersson, submitted research to the Microsoft Security Response Center, which acknowledged the issue but noted that the attack vector remains viable. The article provides a technical overview of deserialization, explaining how serialized data can be exploited through crafted "gadget chains" that trigger harmful function calls. It also details the differences between property bags and rehydrated objects in PowerShell, emphasizing the security implications of deserializing untrusted data. The author references previous research on deserialization attacks and outlines specific types that can be exploited, particularly focusing on ScriptBlock rehydration and its implications for security. The article concludes with recommendations for IT operations and PowerShell developers to mitigate these risks.
- PowerShell's CLIXML deserialization poses significant security risks, including remote code execution.
- Common PowerShell functionalities are vulnerable due to reliance on deserialization processes.
- The article discusses the concept of gadget chains used in deserialization attacks.
- Differences between property bags and rehydrated objects are crucial for understanding security implications.
- Recommendations are provided for mitigating risks associated with CLIXML deserialization.
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