MessagePack Hash Collision DoS Vulnerability Advisory

From this webpage screenshot, the following key information about the vulnerability can be obtained: 1. Vulnerability Description: - Impact: When using the MessagePack library to parse MessagePack data from untrusted sources, there is a risk of denial-of-service attacks. Attackers can send specially crafted data to trigger hash collisions, leading to excessive CPU consumption that is disproportionate to the data size. - Similar Issue: Similar to a previous issue, but the prior fix did not fully resolve the hash collision vulnerability. 2. Affected Versions: - Affected Versions: and - Fixed Versions: and 3. Mitigation Measures: - Upgrade to Fixed Versions: It is recommended to upgrade to the fixed versions within the affected ranges. - Application Configuration: Ensure applications are configured to handle untrusted data appropriately. 4. Workarounds: - Manual Workaround: If upgrading to the fixed versions is not possible, apply the following steps manually: 1. Define a class that inherits from . 2. Override the method to provide a custom hash function. 3. Configure to use an instance of the custom class. 4. Use the custom options object in all deserialization operations. 5. References: - Learn more about best security practices for reading untrusted data. - Discussion by the .NET team regarding hash collision vulnerabilities. 6. Additional Information: - More details about this advisory can be obtained through public discussions or private messaging. This information helps users understand the severity of the vulnerability, the affected version ranges, mitigation steps, and references, enabling them to take appropriate actions to protect their systems.

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MessagePack Hash Collision DoS Vulnerability Advisory

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