CVE-2024-48924— MessagePack for C# 安全漏洞
一分钟漏洞结论
影响对象
MessagePack-CSharp MessagePack-CSharp
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
MessagePack for C#是MessagePack-CSharp开源的一个 MessagePack 序列化程序。 MessagePack for C2.5.187之前版本和2.6.95-alpha至3.0.214-rc.1之前版本存在安全漏洞，该漏洞源于在反序列化来自不可信源的MessagePack数据时，可能由于特意构造的数据产生哈希碰撞，导致不成比例的大量CPU消耗，从而引发拒绝服务攻击。
可能的 ATT&CK 技术 1 AI
T1496 · Resource Hijacking
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一、 漏洞 CVE-2024-48924 基础信息
漏洞信息
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Vulnerability Title
MessagePack allows untrusted data to lead to DoS attack due to hash collisions and stack overflow
来源: CVE Program / CVE List V5
Vulnerability Description
### Impact
When this library is used to deserialize messagepack data from an untrusted source, there is a risk of a denial of service attack by an attacker that sends data contrived to produce hash collisions, leading to large CPU consumption disproportionate to the size of the data being deserialized.
This is similar to [a prior advisory](https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-7q36-4xx7-xcxf), which provided an inadequate fix for the hash collision part of the vulnerability.
### Patches
The following steps are required to mitigate this risk.
1. Upgrade to a version of the library where a fix is available.
1. Review the steps in [this previous advisory](https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-7q36-4xx7-xcxf) to ensure you have your application configured for untrusted data.
### Workarounds
If upgrading MessagePack to a patched version is not an option for you, you may apply a manual workaround as follows:
1. Declare a class that derives from `MessagePackSecurity`.
2. Override the `GetHashCollisionResistantEqualityComparer<T>` method to provide a collision-resistant hash function of your own and avoid calling `base.GetHashCollisionResistantEqualityComparer<T>()`.
3. Configure a `MessagePackSerializerOptions` with an instance of your derived type by calling `WithSecurity` on an existing options object.
4. Use your custom options object for all deserialization operations. This may be by setting the `MessagePackSerializer.DefaultOptions` static property, if you call methods that rely on this default property, and/or by passing in the options object explicitly to any `Deserialize` method.
### References
- Learn more about best security practices when reading untrusted data with [MessagePack 1.x](https://github.com/MessagePack-CSharp/MessagePack-CSharp/tree/v1.x#security) or [MessagePack 2.x](https://github.com/MessagePack-CSharp/MessagePack-CSharp#security).
- The .NET team's [discussion on hash collision vulnerabilities of their `HashCode` struct](https://github.com/GrabYourPitchforks/runtime/blob/threat_models/docs/design/security/System.HashCode.md).
### For more information
If you have any questions or comments about this advisory:
* [Start a public discussion](https://github.com/MessagePack-CSharp/MessagePack-CSharp/discussions)
* [Email us privately](mailto:andrewarnott@live.com)
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
可逆的单向哈希
来源: CVE Program / CVE List V5
Vulnerability Title
MessagePack for C# 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
MessagePack for C#是MessagePack-CSharp开源的一个 MessagePack 序列化程序。 MessagePack for C# 2.5.187之前版本和2.6.95-alpha至3.0.214-rc.1之前版本存在安全漏洞，该漏洞源于在反序列化来自不可信源的MessagePack数据时，可能由于特意构造的数据产生哈希碰撞，导致不成比例的大量CPU消耗，从而引发拒绝服务攻击。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| MessagePack-CSharp | MessagePack-CSharp | < 2.5.187 | - |
|
二、漏洞 CVE-2024-48924 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-48924 补丁与修复 (2)
CVE-2024-48924 厂商安全公告 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2024-48924
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